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by: Christa Hamill


Christa Hamill
Texas State
GPA 3.73

J. Hu

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About this Document

J. Hu
Class Notes
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This 3 page Class Notes was uploaded by Christa Hamill on Wednesday September 23, 2015. The Class Notes belongs to TECH 2342 at Texas State University taught by J. Hu in Fall. Since its upload, it has received 16 views. For similar materials see /class/212730/tech-2342-texas-state-university in OTHER at Texas State University.


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Date Created: 09/23/15
Study for 2341 test 2 o Aggsizes o Rocks 0 Gravelcoarsagg I 3quot8 0 Sand fine agg I 2004 o Silt 00202mm 0 Clay cohesive lt 002mm 0 Agg sources 0 Natural Agg I Gravel pits and river deposits gravel and river stone I Rock quarries crushed stone 0 Manf agg I Slag waste from steel mills I Expanded shale and slays lightweight agg I Styrofoam beads LW agg I Steel slugs and bearings hw agg o Agg processing Vibrating feeder o Jaw crusher prelim crush 0 Impact crusher second crush o Vibrating screen separation 0 Final prod o Agg handling o Fineness modulus fm O 0 Diff types of gradation 0 Max density densewell graded 0 One sized o Gapgraded missing one or more sized of materials 0 Open graded missing small agg sizes that would block the voids between the larger agg 0 Aggregate gradation specification of FCC and ACC O o Agg blending 0 Reasons I Obtain desirable gradation I Single natural or quarried material not enough Economical to combine natural and process materials Trials and error and graphical methods 0 Portland Cement quothydraulic cement cement that not only hardens by reacting with water but also forms a waterresistant product produced by pulverizing clinkers consisting of hydraulic calcium silicates usually containing one or more of the forms of calcium sulfate as an inter ground addition 0 Raw materials of PC 0 Calcium limestone and shale o Silica clay sand shale O o Alumina clay shale slag 0 Iron clay iron ore 0 Process of production 0 Clay crushed limestone Stora e Blending wetdryGrinding Preheating Burning Kiln Clinker cooling Add gypsum slow down setting time to have time to work with it Final grinding most energy consumption 0 Final product Portland cement o Fineness of PC 0 Finer the material the larger the surface area 0 The faster the hydration the faster the strength development 0 The greater the initial heat of hydration 0 Process of cement hydration 0 Initial CSH phase forming of gels Initial set development of weak skeleton Final set development of rigid skeleton Hardening development of strength and durability I WC Water to Cement ratio strength increases with less water 0 Setting times for PC 0 Vicat testing I Initial set gt 45min I Final set lt 375min o Gillmore testing I Initial gt 60min I Final lt 600min 0 Heat of hydration hydration of cement compounds 0 Problems massive structural and cold weather construction 0 Admixtures o Enhance properties 0 Overcome diff situations hot and cold 0 Reduce cost I AEA air entraining admixture stabilize bubbles 0 Provide space for water ice 0 Reduce hydro pressure 0 Lube mix reduce water I Water reducer 510 of water 0 Increase workability 0 Reduce water increase strength and durability 0 Reduce cement content I Highrange WR 2030 0 Commonly used SCMs supplementary cementitious materials a material that when used in conjunction with Portland cement contributes to the properties of the hardened concrete through hydro or pozzolanic activity or both 0000000 000 OO O 0 Benefits o Proble Fly ash slag silica fume Natural pozzolans Shale clay cement kiln dust rice husk ash Reduces cost and reduces environmental impact by using recycled materials Increases physical and durability properties Fly Ash 0 solid silica glass spheres and some hollow cenospheres Silica alumina and calcium Fineness 300400mquot2kg Avg dia lt45 nanometers Slag byproduct of steel and iron manuf Ground granulated blast furnace slag GGBS or GGBFS Rough and angular shape Silica alumina calcium and magnesium Fineness 300500 mquot2kg Avg dia lt 45 nanometers Silica fume Byproduct of reduction of highpurity quartz with coal in an electric arc furnace in the manuf of silicon or ferrosilicon alloy Just silica Fineness about 10000 mquot2kg 0 Avg dia lt 1 nanometer of SCMs Low heat of hydration reducing thermal cracking Good longterm strengths Improve workability Reducing alkalisilica reactivity Lowpermeability Resistance to sulfate acid and chloride diffusivity ms with SCMs Composition varies considerably Low earlystrength Increased rate if carboration Strength reduce Increased plastic and drying shrinkage cracking Altered color


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