Intro to Engr Pract & Princ I
Intro to Engr Pract & Princ I ENGR 1201
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National Structural Concrete Specification for Building Construction V if r Pf Ma a u gv mi i my QUUUQQ 39 Ihilnjd Edition dti National Structural Concrete Speci cation for Building Construction Ref CS 152 First published February 1998 2nd edition December 2003 3rd Edition May 2004 ISBN 1 904482 09 0 OONSTRUCT 2004 Published by The Concrete Society Riverside House 4 M wwwconcreteorgu A technical committee of OONSTRUCT The Concrete Structures Group prepared this Speci cation as a further revision of t e a S at39 39 39 C Trade and Industry placed on 1st October 1999 Any views expressed are not necessarily those of the DTI All data information and opinions contained herein aim to re ect accepted practices at the time of publication While every effort has been made to ensure accuracy no responsibility can be acce ed for errors and omissions however caused No responsibility for any loss occasioned as a result of material in this publication is accepted by the authors or publishers Responsibility for interpretation of the material contained in this publication rests entirely with the user All rights reserved Unless it conforms entirely with the Licen e Agreement stated in the ReadMe le contained on the CD Rom disc no part of this publication may be reproduced stored in a retrieval s or transmitted in any form or by any means electronic mechanical photocopying recording or otherwise without the prior permission of OONSTRUCT National Structural Concrete Specification for Building Construction Third Edition NSCS page 3 This Speci cation was prepared with the guidance of a Project Steering Group comprising Concrete Structures Group CONSTRUCT Building Research Establishment BRE British Cement Association BCA The Concrete Centre TCC Techrical Committee Attending members Mr Julian Maw Chairman Mr Vic Dunham Editor Mr Colin Banks Mr Edwin Bergbaum Mr Andy Butler Mr Keith Chamberlain Mr Saleem AkramM Mr Alastair Craig Mr Richard Day Mr Anatol Himowicz Mr John Mason Mrs Deborah Lazarus Dr Richard Moss Part 3 Advisor Mr Martin Southcott Mr Paul Toplis Mr John Webster Visiting specialists Mr Kevin Bennett Mr Peter Croft Corresponding members Mr Bob Gordon Dr Sisan Doran Mr Peter Matthew Mr John PIumb lMs Liz Marwood DE TRLiaison r John Mason Acknowledgments JJA Maw Consultants Peter Brett Associates O39Rourke Group Waterman Partnership Stanhope CIOB CIOB Carillion Building The Concrete Society Byrne Bros John Doyle Construction Stevenson Shutterin Alan Baxter and Associates Ove Arup and Partners The Concrete Centre Price amp Myers BAA Freyssinet Ltd Ltd and British Precast Concrete Federation MACE Institution of Structural Engineers Matthew Consultants Whitby amp Bird British Property Federation Cadogan Tietz Institution of Civil Engineers Alan Baxter and Associates The work of preparing this Speci cation was partly funded by the Partners in Technology now Partners in Innovation scheme of the Department of the Environment Transport and the Regions now administered by Department of Trade and Industry CONSTRUCT and the authors thank the numerous organisations from all sections of the industry whose views and comments have been sought and carefully reviewed for inclusion On Second Edition Technical Committee only On Third Edition Technical Committee only page 4 NSCS Contents The pa numbers for Guidance Notes are shown alongside those for the relevant sections 0 Parts 1 and 2 for easy crossreferencing FOREWORD 8 SCOE 9 andard Guidance speci cation Notes Part 1 Standard specification 11 De nitions 12 46 SEC39I10N 1 MATERIALS WORKMANSHIP AND CONSTRUCTION 14 47 11 General 14 47 111 Quality of materials 14 47 112 Standard of workmanship 14 47 113 Modi cations 14 47 114 Coordinated information 14 47 115 A ceptance procedures 14 47 116 Setting out the structure 14 47 117 Construction loads 14 47 118 Waterresisting construction 14 47 12 Quality assuance 14 48 121 Quality management system 14 48 Documentation 14 48 13 Testing 15 48 131 Test results 15 48 132 Additional inspections and tests 15 48 Test nonconformity 15 48 14 Drawings and reinforcement schemles 15 48 141 British Standards numbering and revisions 15 48 142 Asbuilt drawin s 15 48 143 Reinforcement schedules 15 48 144 Builders work drawings 15 48 145 Erection drawings 15 48 SECTION 2 FALSEWORK AND FORMWORK 16 49 21 Standards 16 49 22 1ypes of material 16 49 23 Release agents 16 49 24 Formwork use 16 49 25 Block outs and castin items 16 50 26 Formwork ties 16 50 27 Striking 16 5051 28 Con ruction joints and pour sizes 17 51 29 Waterresisting construction 17 51 ASCS page 5 Part1 Standard Guidance specification Notes SECTION 3 REINFORCEMENT 17 51 31 Materials 17 51 311 General 17 5152 312 Reinforcement supply and testing 1718 52 313 Spacers 18 52 314 Couplers 18 52 315 Continuity strips 18 52 32 Workmanship 18 52 321 General 18 52 322 Tying and welding 18 52 323 Projecting reinforcement 18 53 SECTION 4 CONCRETE AND CONCRETING 19 53 41 Concrete 19 5354 411 General 19 5455 412 Plant Readymixed concrete 19 56 413 Plant Other concrete 19 56 414 Supply and transport 19 56 42 Concreting 19 56 421 Placing and compaction 1920 5657 422 Concreting in extreme weather 20 5657 43 Curing and protection 20 57 431 Curing 2O 57 432 Protection 20 57 44 Conformity and identity testing during concreting operations 20 5758 45 Inspection 20 5859 451 Inspection before placing 20 5859 452 Inspection after placing 21 5859 46 Surface nishes 21 5961 461 Formed finishes 21 5960 462 Unformed finishes 21 6061 463 Surface cracking 21 EL SECTION 5 PRECAST CONCRETE 21 61 51 General 21 a 52 Manufacture and supply 21 61 521 General 2122 a 522 Reinforcement 22 62 523 Steam curing 22 62 524 Demoulding 22 62 53 Marking 22 62 54 Storage 22 62 55 Handling and erection 23 62 56 Alignment of precast units 23 62 57 Mortar 23 62 58 Concrete infill 23 62 59 Composite construction 23 62 510 Connections 23 62 page 6 NSCS Part1 Standard Guidance speci cation Notes SECTION 6 PRESTRESSED CONCRETE 23 62 61 General 23 62 62 Standards and design guides 23 62 63 Type of system and method statement 24 63 64 Materials and equipment 24 63 641 Prestressing tendons 24 63 642 Untensioned reinforcement 24 63 643 Sheaths 24 63 644 Anchorages 24 63 645 Concrete strength at transfer 24 63 646 out 2425 63 647 Tensioning apparatus 25 63 648 Transportation storage and handling 25 63 65 Workmanship 25 63 51 General 25 6364 652 Safet 25 64 653 Sof fit marking 25 64 654 Anchorages tendons and sheathing 2526 64 655 Tensioning 26 64 656 Anchoring 26 64 657 Grouting 26 64 658 Reco ds 26 64 659 Final protection of anchorages and tendons 26 64 SECTION 7 CONSTRUCTION ACCURACY 27 64 71 General 27 6465 72 Size of elements 27 65 721 Slab thickness 27 65 722 Formed elements 27 65 73 Twist of elements 27 65 74 Squareness of elements 27 65 75 Position on plan 28 65 76 Level of elements 28 6566 77 Castin fixings 28 66 78 Verticality of elements 28 66 79 Bow of elements 29 66 710 Abrupt changes of continuous surfaces where finish is not specified 29 66 711 Castin foundation bolts 29 66 712 Cover to reinforcement 29 66 713 Prestressed concrete 29 66 REFERENCES 30 73 NSCS page 7 Part 2 Project specification GENERAL SECTION P1 INFORMATION TO BE SUPPLIED TO THE SCC P11 Proposed works P12 Design P13 Drawings and calculations P14 Materials P141 Concrete P142 Other materials P15 Project requirements P16 Waterresisting construction P17 Surface finishes P18 Concrete P181 Designated concrete P182 Designed concrete P183 Prescribed concrete P184 Standardised Prescribed concrete P185 Proprietary concrete P19 Construction planning P110 Further information SECTION P2 INFORMATION TO BE SUPPLIED BY THE SCC P21 General P22 Design P23 Drawingscalculations and reinforcement schedules P24 Materials P25 Falsework and Formwork P26 Reinforcement P27 Concrete and concreting P28 Construction planning P29 Precast concrete P210 Further information SOURCES OF INFORMATION Part 2 Project specification 31 32 888885 5 5 5 8B Q l on on eea Guidance Notes 66 66 page 8 NS CS Foreword The Third Edition ofthe National Structural Concrete Specification for Building Construction NSCS has been prepared to provide a revised Section 4 Concrete and concreting in accordance with BS 8500 Concrete Complimentary British Standard to BS EN 2061 and BS EN 206 Concrete Speci cation performance production and conformity It is needed because the readymixed concrete industry changed from using BS 5328 Concrete to using BS 8500 on 1st December 2003 BS 5328 was then withdrawn and there was no overlap period when both standards were in use The change from using BS 5328 Concrete to using BS 8500 by the readymixed industry on 1st December 2008 meant that a need exists forspecification to the new standard It was felt that a further edition of the REDS was required at this stage to caterfor the introduction of European standards and terminology Apart from Section 4 of the Standard Specification Part 1 Project specification Part 2 and the Guidance Notes the rest of the edition is as the Smond Edition The review panel for the specification expect to produce a fourth edition coordinated with other Eurocodes when they are all available in this edition comments and feedback on the use of the second and third editions will be incorporated throughout the specification The NSCS still has the same objectives as a definitive simple and straightforward specification without unnecessary constraints This is seen as essential in the drive to increase efficiency in the construction of concrete buildings whilst maintaining or improving their quality The lBCS is arranged in two parts Part 1 Standard specification and Part 2 Project specification together with Guidance notes covering both parts The Guidance Notes do not form part ofthe formal construction specification The Standard speci cation Part 1 provides a standalone base specification with standard clauses on materials workmanship and construction for the production of consistent and wellconstructed reinforced concrete structures Part 1 can be split into sections for distribution to the relevant trades for construction The Project speci cation Part 2 provides for information and requirements specific tothe project It records by exception any amendments to Part 1 considered neoessa by the designer and is also the part of the specification where information is provided by the tenderer This enables tender documents orthe contract for construction to incorporate Part 2 only because it refers explicitly to Part 1 as its base document 111e Guidance notes form a companion document to Part 1 and Part 2 and give background information togetherwith explanations of why certain clauses have been adopted The information is intended to be of use to both the designer and contractor Under the lBCS approach the Engineer remains responsible for using normal skill care and diligence to design the structure and the Specialist Concrete Contractor m builds what is shown on the drawings to a specified standard of workmanship The 833 is expected to exercise in the performance of duties such skill care and diligence as may be expected of an experienced contractor used to working on projects of similar size scope and complexity to the project under consideration It is assumed that the execution of the provisions of the l83S is entrusted to appropriately qualified and experienced organisations Prescriptive restraints have been avoided to enable the Specialist Concrete Contractors experience to be used to achieve efficient construction The lBCS is authoritative simple and straightforward and the benefits of its use will best be achieved by continuing the collaboration between contractors specifiers and designers which arose during its development The NSCS provides for agreement to be reached between the 833 and Engineer on projectspecific items that affect the pricing of the works A clear le prescriptive specification resulting from a single national standard for concrete structures will help innovation efficiency and competition thus better meeting the needs of clients and the public All parties involved in the construction process from the client to the subcontractor are expected to benefit Clients will receive better le costly construction Designers will no longer have to devise their own specifications Contractors will be able to identify more clearly the risks and requirements of the project and will have more freedom to innovate and develop their own solutions Such an approach is particularly appropriate given the contractual arrangements currently being employed A review panel will keep the document up to date in the light of comments and feedback received from all parts of the industry Any inaccuracies and ambiguities found or proposals for future editions should be submitted to WLCT NSCS page 9 Scope General The lBCS ren ains laid out in terms of process rather than in terms of materials and workmanship British Standards are referenced ratherthan reproduced Where the lBCS is at variance with British Standards the NSCS is to be used The lBCS covers requirements for the construction of concrete building structures of insitu concrete precast concrete and hybrid concrete system It is especially relevant for structures designed to BS 8110 and EN 1992 EC2 Where the lBCS is to be used for structures in extreme environments those produced by specialist construction techniques or those of a specialist design nature Part 2 Project specification should include the appropriate particular requirements he lBCS is written with safety in mind but does not specify health and safety requirements as these are covered by legal regulations that apply to all construction and are outside the scope of this specification Where specifications standards or regulations are referenced readers should ensure that they refer to the latest editions NSCS Part 1 Standard specification Specific obligations are placed on the Specialist Concrete Contractor the Employer and the Engineer In some cases these will be different organisations sometimes any or all will be represented by the same organisation However their responsibilities remain as required underthe Contract NSCS Part 2 Project specification This part is to be read in conjunction with lBCS Part 1 and outlines project information speci c to a particular project and additional to the requirements of NSCS Part 1 Part 2 covers the exchange of information nmessary between the Employer and Specialist Concrete Contractor at both tender stage and contract stage The relevant sections of Part 2 should be completed at the appropriate stage Part 2 allows the Engineer responsible for the design the freedom to incorporate speci c Clauses to vary the standard Clauses of Part 1 It is emphasised that lBCS Part 1 has been produced as a nonprescriptive specification and therefore any amendments through lBCS Part 2 should be as few as possible The proforma layout of Part 2 acts as an aide memoire to the disclosure of relevant information for most types of project To aid the task of preparing a Project speci cation permission is hereby expressly given for users of this document to copy any part or the whole of Part 2 Project speci cation without infringement of copyright Ad u A t NSCS Guidance notes The Guidance notes are for information only and do not form part of the Specification They provide background information on the content of the Supplement Parts 1 and 2 and explain why certain Clauses have been adopted They include reference to the terminology changes used in the new Standards which may be strange for UK users and are designed to be 39dipped into39 and read with the relevant clauses in Parts 1 and 2 As a resultthere is some intentional duplication National Structural Concrete Specification for Building Construction Third Edition PART 1 STANDARD SPECIFICATION page 12 Part 1 Standard speci cation NSCS Definitions In this Specification the following definitions apply Agreement acceptance When by or of the Contract Administrator CA these terms shall have the following limitations a When given in respect of samples of materials workmanship or proposals for methods of construction submitted in accordance with this Specification shall not be interpreted as denoting any degree of satisfaction with the materials used in or the execution of the structure b When given in respect of drawings documents or schemes called for by the Specification or proposed by the m it is only for conformity with the design concept and design information given in the Contract Documents or contained in subsequent instructions from the CA Contract administrator CA The named individual or company engaged to act for and on behalf of the Employer for the purposes of accepting proposals from the SW issuing technical information to the SE and monitoring the work ofthe SOC Design calculations The calculations produced generally bythe Engineer and bythe SE for some specialist work Drawings General arrangement drawings GAs Plans and sections indicating the layout and dimensions of each floor of the structure The drawings will be in sufficient detail to allow the formwork to be constructed and will show or reference all inserts castin items and holes Gk may also indicate the locations of concrete grades and finishes Design information drawings Drawings showing the design information required to enable reinforcement detail drawings to be produced Reinforcement detail drawings Drawings showing the layout of the various types of reinforcement used in the construction of the structure Reinforcement schedules Schedules giving the details of each reinforcing bar to be cast into the concrete Builders work drawings Drawings showing coordinated builders work holes castin services fixings etc Erection drawings Drawings or sketches indicating any special requirements or methods that the SE must use to erect the structure in a safe manner As buit drawings Drawings indicating what was built Temporary works drawings Drawings showing nmessary falsework formwork and propping used to constructthe structure in a safe manner Emp oyer The individual or company placing the contract with the SQ Engineer The individual or organisation responsible forthe design of the structure Falsework The temporary structure used to support a permanent structure until it is self supporting Formwork The part ofthe falsework used to give the required shape finish and support to the poured concrete Nscs National Structural Concrete Specification for Building Construction comprising Parts 1 and 2 NSCS Part 1 Standard speci cation page 13 Precast concrete Concrete elements cast in formwork and fabricated at a location separate from the final position in the structure Prestressed concrete Concrete that is subjected to pretensioning or posttensioning Reference panels Fullsize concrete panels of Type A and Type B finishes manufactured by mTRLCT and available for inspection at various locations around the UK sec The Specialist Concrete Contractor constructing the structure Site The designated place where the SE will construct the structure Spacers All chairs blocks supports and devices of a special nature required to hold the reinforcement in the correct position during concreting Structure The concrete structure comprising any or all of the following elements columns walls slabs bean s bracing stairs foundations and sundry items designed bythe Engineer Temporary works coordinator The named individual ofthe 8E responsible for coordinating the temporary works for construction ofthe structure page 14 Part 1 Standard speci cation NSCS SECTION 1 Materials workmanship and construction 11 111 GENERAL Quality of materials All materials used in the structure shall comply with NSZS and current versions of standards referred to therein The CA may specify samples for testing and the XI shall arrange for such samples to be supplied identified stored and tested and the results delivered to the CA in accordance with the relevant British Standards Standard of workmanship The standard of workmanship shall be in accordance with this Specification the relevant clauses of BS 8110 and all statutory requirements Proprietary products and materials shall be used in accordance with the manufacturer39s written instructions Modifications e 83C shall obtain the agreement of the CA to any modifications to the requirements of this Specification in writing before any work is started Coordinated information The KJC shall ensure that coordinated information is submitted to the CA for agreement before work is started on site Acceptance procedures i An acceptance procedure for the issue of construction information shall be agreed with the CA before construction of any work ii Information shall be suppliedagreed as stipulated in this Specification to an agreed timescale and the CA shall comment on the information within five working days of receipt iii Acceptance or agreement by the CA shall have no effect unless given in writing No such acceptance or agreement shall in any way relieve or diminish the obligations of the KJC under the Contract Setting out the structure The KJC shall set out the structure to the given setting out information Construction loads During construction the XI shall ensure thatthe structure is not subjected to loads which will cause shortterm or longterm distress and shall take account of the maturity ofthe concrete at the time of loading Waterresisting construction i Where waterresisting construction is specified all construction and materials shall meet the recommendations of BS 8102 and details shall be submitted by the XI to the CA for agreement ii Where waterresisting construction with a waterproofing system is specified the XI shall submit to the CA before starting work written confirmation from the waterproofing system supplier that the proposed concrete mix placing methods release agents curing compounds movementjoint details surface finishes reinforcement support methods and loads will not adversely affect the performance of the waterproofing system QUALITY ASSURANCE Quality management system The KJC shall operate an agreed quality management system to BS EN IS 9000 unless otherwise agreed with the CA which shall be accessible for audit Documentation A documentation shall be available for inspection during the contract period NSCS Part 1 Standard speci cation page 15 13 131 1 4 141 TESTING Test results The SCI shall supply three copies of all test results to the CA as soon as they are available Additional inspections and tests If the CA requires more inspection and testing to be carried out than that specified it shall be at the SOC s expense if the results do not meet the Specification requirements Otherwise all oosts shall be additional to the contract Test nonconformity i Any test results which do not meet the specified criteria shall be reported to the CA In the light of this nonconformity the KJC shall propose a course of action to the CA for agreement within one week of reporting the results The material to which the test nonconformity applies shall be deemed to be unacceptable unless further testing or analysis proves otherwise and all associated costs shall be borne by the SOC Any remedial work shall be at the SOC s expense ii A course of action shall be agreed within a further week DRAWINGS AND REINFORCEMENT SCHEDULES British Standards numbering and revisions Drawings shall comply with the following requirements i Drawing standards shall be as set out in BS EN ISO 4157 Parts 13 1999 Revisions and status shall be clearly shown including dates when revisions were made A circle or cloud around revisions to drawings should identify revisions made for the latest revision number or letter used Such revisions should be described in a brief narrative form on the drawing corresponding to the latest revision number or letter ii A register of drawings received and issued by the XI shall be maintained and available for the CA at any time The register shall clearly identify the following information name of c mpany which produced the drawing drawing number with revision number or letter dates received and issued by the SOC iii The method of circulation number of drawings to be issued and schedule of dates when drawings will be issued for comment and when comments will be returned shall be agreed with CA Asbuilt drawings The KJC shall provide sufficient information to the CA to allow coordination of the production of asbuilt drawings Reinforcement schedules The KID shall be responsible for the accuracy of any reinforcement schedules produced by the SOC Scheduling of reinforcement shall be in accordance with BS 8666 and BS EN ISO 4066 Builders work drawings Sufficient information shall be provided to enable builders work drawings to be produced Erection drawings Any special stability requirements during erection must be clearly indicated The KID will normally be responsible for the production of these drawings but they may be produced for the SOC page 16 Part 7 Standard speci cation NSCS SECTION 2 Falsework and formwork 2 STANDARDS Design and construction of falsework and formwork shall be in accordance with the following where applicable BS 5975 Code ofpractice for falsework Forrnwork39 a quot a 39 39 quot r 39 1995 Construct Guide for flatsab form work and falsework Concrete Society 2003 CIRIA Report 136 Form work striking times criteria prediction and methods ofassessrnent CIRA1995 BS 8110 Structural use ofconcrete Part1 C d quot d 39 39 quot TYPES OF MATERIAL Formwork materials shall suit the method of construction to be used and the surface finish required for the final work Permanent formwork may be used subject to the agreement of the CA RELEASE AGENTS The 8E shall choose release agents to suit the method of construction and the finish required and shall take note of the requirements of subsequent trades All release agents used shall be nonstaining noninjurious to the finished concrete and shall not be adversely affected by the weather FORNIWORK USE Formwork shall be constructed so as to contain the concrete to give the required surface finish to the concrete and to adequately support the concrete in the desired final position throughout the period of use Where structural concrete relies on permanent ortemporary support from the ground the 833 shall ensure that the support is adequate for concrete operations Formwork shall be clean and clear of all debris free water and ice before concrete is placed Concrete shall not be cast directly against existing construction or faces of excavations without the prior agreement of the CA BLOCK OUTS AND CAST IN ITEMS The 8E shall clear out block out items after concreting The 83C shall set out and fix all castin items shown or referenced on the drawings Any clashes between holes castin items and reinforcement shall be resolved before any concrete is placed FORNIWORK 11ES Throughties ma be used to support vertical faces of formwork other than in waterresisting construction or as agreed with the CA No ferrous metals shall be left in the concrete cover zone when formwork has been struck The 833 shall make good any holes left exposed to view in the faces of the concrete to the agreement of the CA In waterresisting construction methods of fixing formwork which result in holes through the concrete section when formwork is removed shall not be used In waterresisting construction ties used shall be of a type to maintain water resistance of the construction STRI KING The concrete shall be supported in the required position until it has adequate strength as determined by the SQ to support its own weight and any construction loads without shortterm or longterm distress ASCS Pan 1 Standard speci cation page 17 ii Formwork may be struck at a time determined by the SOC considering the concrete strength at the time of removal the ambient conditions and the curing and protection of the concrete that is to be used when the formwork has been removed iii Formwork shall be removed carefully to avoid damaging the concrete surface Any damage so caused shall be made good by the SCI to the acceptance of the CA iv The exact sequence of proppingrepropping and backpropping through the structure shall be set out in a method statement prepared by the SOC shall be agreed with the CA in advance and shall have no damaging effect on the permanent structure 28 CONSTRUCTION JOINTS AND POUR SIZES i The KID shall position and form construction joints to suit the structure and so as not to cause any shortterm or longterm distress to the structure all to the agreement of the CA ii The KID shall carefully prepare construction joint surfaces to expose the coarse aggregate to provide a key by a method to be agreed with the CA iii Pour sizes except as agreed otherwise between the CA and SOC shall be as shown in Table 1 Table 1 Maximum areas and dimensions of concrete pours for different types of construction Construction MaXImun area MaXImum m dimension m Waterresisting walls 25 5 Waterresisting slabs 100 10 Slabs with major restraint at both ends 100 13 Slabs with major restraint at one end only 250 20 Slabs with little restraint in any direction 500 30 Walls 40 10 29 WATERRESISTING CONSTRUCTION i In waterresisting construction waterstops shall be used in all construction joints and movement joints in accordance with the manufacturer39s written instructions The KJC shall obtain the agreement of the CA for the methods to be used to maintain the waterstops in their correct locations and to prevent damage while the concrete is being placed and during and after removal of the formwork ii The KID shall submit to the CA for agreement drawings indicating the positions ofjoints and details of waterstops to be used Details shall include schedules of all junction pieces which shall be purpose made and isometric layouts of waterstops iii Where waterstops within the concrete section are proposed the KJC shall submit to the CA for agreement details of the methods to be used to ensure full compaction of the concrete around the waterstop SECTION 3 Reinforcement 31 311 iii MATERIALS General All reinforcement shall comply with the requirements of BS 4449 BS 4482 BS 4483 BS 8666 as appropriate Reinforcement in accordance with BS 4449 shall be ductility class B Reinforcement supply and testing The KJC shall submit details of the source and supplier of reinforcement to the CA for agreement Unless otherwise agreed by the CA all reinforcement suppliers shall hold a valid Certificate of Approval for anufacture andor fabrication issued by the UK Certification Authority for Reinforcement Steel CARES The UK CARES Certificate of Approval Number shall be stated on all documentation If reinforcing steel is cut and bent by a supplier other than a UK CARESapproved supplier the fabricator shall operate a quality management system to BS EN ISO 9002 which shall be approved as part ofthe SOCs quality management system page 18 Pan 1 Standard speci cation NSCS 313 All reinforcement shall be delivered in clearly identified tagged bundles mats or prefabricated assemblies and shall be stored on site in a manner so as not to be contaminated or otherwise damaged Fabric shall be stored flat All dimensions shall be to the reinforcement schedules given in BS 8666 unless otherwise specified Reinforcement shall not be dropped from a height mechanically damaged or shock loaded in any wa Spacers The KJC shall detail supply and fix all spacers The materials and workmanship shall be in accordance with BS 8110 Part 1 1997 Clause 73 and BS 7973 Spacers and chairs for steel reinforcement and their speci cation The KJC shall ensure that the spacers have the required performance characteristics In exposed finish work the type of spacer used shall be agreed with the CA before any work is started Couplers The KJC shall submit details of the source and suppliers to the CA for agreement All manufacturerssuppliers shall be registered members of the UK CARES Quality Assurance scheme or equivalent unless agreed otherwise by the CA Continuity strips Proprietary continuity strips can be used subject to agreement by the CA WORKMANSHIP General All reinforcement shall be fixed in position in accordance with the reinforcement detail drawings and reinforcement schedules Any alterations to the reinforcement shall be carried out only with the prior written agreement of the CA At the time of placing concrete reinforcement shall be clean free of corrosive pitting loose rust and mill scale and other substances that may adversely affect bonding with concrete Light surface rust will be accepted All cutting bending and fixing shall be in accordance with BS 8110 Part 1 1997 Clauses 72 and 73 Tying and welding Tying of reinforcement shall be carried out with black annealed mildsteel 16gauge tying wire All ends shall be bent away from the concrete face and all loose ends shall be removed before placing the concrete Welding of reinforcement shall be in accordance with the requirements of BS 8110 Part 1 1997 Clause 76 and BS 7123 Speci cation for metal arc welding of steel for concrete reinforcement Welding procedures and welder qualifications shall be subject to the agreement of the CA Projecting reinforcement All reinforcement ends left projecting from cast concrete shall be free of release agents and shall be protected against damage and corrosion although light surface rusting will be accepted NSCS Pan 1 Standard speci cation page 19 SECTION 4 Concrete and concreting 41 CONCRETE 411 General i Concrete shall conform to BS 85002 and shall be as specified in NSZS Part 2 ii Procedures for producing concrete shall be in accordance with BS EN 20612002 section 9 and BS 850022002 section 11 Procedures for ensuring conformity of concrete shall be in accordance with BS EN 2061z2000 and BS 850022002 section 10 iii The SEC shall submit as appropriate details of the proposed concretes in accordance with BS EN 2062000 Clause 72 and BS 850012002 Clause 52 to the CA for approval iv The chloride content of the proposed concrete including chlorides contained in the admixtures shall be limited by BS EN 20612000 Clause 527 The KJC shall provide evidence of conformity v Calcium chloride shall not be included in any concrete vi Precautions shall be taken to restrict the amount of sulfate in the proposed concrete to 4 803 by mass of cement except when using 39 39 W J and 39 slag W J Note Guidance is given in BS 850012002 Annex A104 and A106 vii The KJC shall provide evidence of conformity to the provisions to minimise the risk of damage by alkalisilica reaction given in BS 850022002 Clause 52 viii No additions or changes to the fresh concrete shall be made after batching without prior agreement of the CA ix Daily maximum and minimum atmospheric shade temperatures shall be recorded using a calibrated thermometers located close to the structure x Recycled aggregate and recycled concrete aggregate shall conform to BS 850022002 Clause 43 and to the additional requirements given in NSZS Part 2 412 Plant Readymixed concrete i Readymixed concrete shall be supplied by a producer from a plant holding current accredited third party certification meeting requirements of BS EN 20612000 Annex C The KID shall provide the CA with confirmation of the producer39s certification in accordance with BS EN 20612000 Annex C3 ii Details of readymixed concrete plants proposed for use shall be submitted by the KJC to the CA Contingency plans shall be in place before starting work in the event of supplies being interrupted during a pour due to a plant breakdown Where feasible details of a suitable backup planthupplier should be submitted to the CA for agreement 413 Plant Other concrete For supplies of concrete from sources other than plants holding current third party certification the XI shall submit information to the CA that the production and conformity control systems used are in accordance with BS EN 20612000 Clauses 8 9 and 101 and also BS 850022002 Clauses 10to 12 414 Supply and transport All concrete shall be supplied and transported to the point of discharge from the mixeragitator truck in accordance with the requirements of BS EN 20612000 Clause 7 and BS 850022002 Clause12 Delivery ticket information shall be in accordance with BS EN 20612000 Clause 73 and BS 850022002 Clause 91 as relevant and shall be completed and available before discharging concrete into the structure All delivery tickets shall be retained by the XI until the structure is handed over to the Employer Where a ticket is marked 39non conforming39 a copy shall be passed to both the XI and the CA within 24 hours of placing the concrete 42 CONCRETING 421 Placing and compaction i Concrete shall be placed and compacted in the structure in accordance with BS 8110 Part 1 1997 Clause 622 ii Concrete shall be placed and fully compacted so as to avoid cold joints and honeycombing and to minimise segregation excessive blemishes or other defects in the hardened concrete page 20 Part 1 Standard speci cation NSCS iii 43 431 44 45 451 Kickerless construction shall be in accordance with Kickeress construction British Cement Association 1996 Where kickers are used they shall be monolithic with the slab of sound construction and at least 100 mm hig For waterresisting construction kickers shall be cast 150 mm high and monolithic with the slab Arrangements for premature stoppage of a pour shall be agreed and in place before work starts Should premature stoppage of a pour occur the KIC shall agree with the CA the extent and timing of any necessary remedial work before resumption of placing Concreting in extreme weather For concreting in cold weather the recommendations of BS 8110 Part 1 1997 Clause 624 shall be followed and further guidance may be found in BS 850012002 Annex A111 For concreting in hot weather the recommendations of BS 8110 Part 1 1997 Clause 625 shall be followed and fu r ther guidance may be found in BS 850012002 Annex A112 CURING AND PROTECTION Curing The surface of the concrete shall be cured to avoid premature drying out Methods of curing and curing periods shall be in accordance with BS 8110 Part 1 1997 Clause 623 and as agreed with the CA Curing membranes shall be compatible with any finishes to be applied subsequently Protection All surfaces shall be protected from the effects of adverse weather in accordance with BS 8110 Part 1 1997 Clause 6233 The structure shall be protected against damage Damage occurring shall be made good by the 33C Methods to be used shall be proposed by the KIC for agreement with the CA The faces of cast concrete that will be visible in the completed structure shall be protected from rust staining lf concrete is to be placed in a large volume pour if a rich concrete is used or ifthe section is thicker than 500 mm consideration shall be given to the concrete temperature rise above ambient and to reducing the risk of early thermal cracking The KIC shall ensure that the temperature of the concrete does not exceed 65 C and that the temperature differential does not exceed the appropriate values given in Concreting deep lifts and large volume pours CIRIA 1995 Table 2 Where a risk of thermal cracking is identified the location of temperature monitoring apparatus and interpretation of the temperatures recorded shall be agreed with the CA prior to installation CONFORMITY AND IDENTITY TESTING DURING CONCRETING OPERATIONS The producer shall carry out sampling and testing for conformity during concreting operations in accordance with BS EN 20612000 Section 8 and BS 850022002 Section 10 Where the producer identifies a nonconformity that was not obvious at delivery this shall be reported to the CA and the Employer within 24 hours of the KIC receiving notification The 32C shall carry out testing in accordance with BS EN 12350 Testing fresh concrete to ensure concrete consistence and where relevant air content at delivery is in accordance with this specification If water or other material is added to the concrete truck mixer drum before discharge in accordance with BS EN 20612000 Clause 75 additional identity testing for strength shall be carried out where designated or designed concretes are used Concrete cubes shall be tested in accordance with BS EN 12390 in a UKAS accredited laboratory or equivalent independent of contractual parties Where identity testing is required for designed concretes as defined in Part 2 of this specification the KJC is to inform the producer that identity testing for strength is required The criteria for acceptance will be that given in BS EN 206 Appendix B INSPECTION lnspec on before placing The KIC shall inspect the formwork spacers fixed reinforcement and inserts before placing the concrete and shall only allow concrete to be placed once the work is satisfactory and the CA has had reasonable opportunity for inspection NSCS Part 1 Standard speci cation page 21 Inspection after placing After the specified period of curing the XI shall inspect the relevant work If any remedial measures are necessary the XI shall submit details to the CA for agreement ii In waterresisting construction inspection to identify defects which may lead to water penetration shall be carried outjointly with the KJC and CA before backfilling or covering up Further inspection shall bejointly carried out to identify any water penetration after backfilling Any leaks or damp patches shall be repaired by methods proposed by the XI and agreed with the CA in accordance with BS 8102 1990 Clause 88 and 89 and CP 102 1973 46 SURFACE FINISHES 461 Formed finishes Unless a finish is specified Type A shall be provided i Basic finish requires compliance with all relevant clauses of this Specification ii Type A finish is as defined by BS 8110 Part 1 1997 Clause 6273 Type A The resulting finish shall be similar to the regional Reference Panels iii Type B finish is as defined by BS 8110 Part 1 1997 Clause 6273 Type B The resulting finish shall be similar to the regional Reference Panels iv Type C finish shall be as specified in NSZS Part 2 462 Unformed finishes Unless a finish is specified Type U1 shall be provided i Type U1 finish The concrete shall be levelled to produce a closed uniform surface No further work shall be carried out ii Type U2 finish shall be produced by floating or a similar process to produce a level uniform surface iii Type U3 finish shall be produced by trowelling or a similar process to produce a dense smooth surface iv Types U4 finish shall be produced by further working of either U1 U2 or U3 type of finish as specified in NSZS Part 2 463 Surface cracking The KID shall take all reasonable actions to minimise surface cracking Unless otherwise specified isolated cracks of width up to 03 mm will be accepted in localised areas Cracking that will allow corrosion of 39 39 39 quot quot water leakage impair durability or reduce structural adequacy shall be rectified by the KJC as agreed with the CA SECTION 5 Precast concrete 51 GENERAL This section deals with additional considerations for structures partly or wholly of precast construction 52 MANUFACTURE AND SUPPLY 521 General i The KID shall submit details of the proposed concrete plant to the CA for agreement before starting work ii The precast concrete plant shall operate an agreed quality management system to BS EN ISO 9000 unless otherwise agreed with the CA This system shall include appropriate methods of checking the work to ensure that the precast a in 39 with all the contractual requirements The relevant Standards applicable to the project shall be identified in the Quality Plan where not specified elsewhere in the documentation iii Before any precasting is carried out the KJC shall agree with the CA all details of manufacture supply and testing