CE165 – Midterm Review

CE165 – Midterm Review - This review covers:...

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E165 idterm Review CE165 – Midterm Review Rosie Chae [email protected] March 18, 2008 This review covers: ± 1999 CE165 Midterm Exam ² The powerpoint will be posted on bspace ² No need to take notes ² BUT, jot down references as you see ecessary necessary Question 1 ± A portland cement has the following composition: 60% C3S, 15% C2S, 3% C3A 12% C4AF 13% C3A, 12% C4AF ² Will the cement give early strength? ill the cement generate high heat of ² Will the cement generate high heat of hydration? what type of construction should you ² In what type of construction should you NOT use this type of cement? Start by analyzing the composition…. Reference: Table 6-6, p. 228
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C Compounds tandard” ur Composition omment PC Compounds Standard composition (type 1) Our Composition Comment 3S 0- 5% 0% IGH C3S 50 55% 60% C2S 15-20% 15% HIGH LOW C3A 5-12% 13% HIGH C4AF 6-10% 12% HIGH ..then look into hydration reaction ± 2 C3S + 6 H CSH + 3 CH (120 cal/g) ± 2 C2S + 4 H CSH + CH (62 cal/g) ± C3A + gypsum Ettringite (300 cal/g) Monosulfate Reference: p 213-220, table 6-4 he cement will generate high heat of The cement will generate high heat of hydration due to it’s high C3S and C3A content, and low C2S content. The cement will also produce more CH and Ettringite/Monosulfate, and less CSH. Compare the strength development… During concrete’s early ages, strength development is ominated by CH and dominated by CH and ettringite formation. Since CSH is the best trength contributing strength contributing hydration product, the cement will have high Reference: Figure 6-10, p 223 early strength, but low long term trength. strength. Construction Application ± Desirable for: emergency repair, cold weather construction ± Undesirable for: hot weather construction, mass construction (ex. ams) when sulfate resistance is dams), when sulfate resistance is required (ex. sewer)
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Question 1 ± What do you know about the composition and principal haracteristics of the following characteristics of the following cement types: Type IS cement, alcium aluminate cement calcium aluminate cement Type IS Cement lended cement : Portland cement + blast ± Blended cement : Portland cement + blast furnace slag (weakly cemetitious & pozzolanic) low strength development ± Slow strength development ± Low heat of hydration ± Improved workability ± High long term strength ± Low porosity and permeability – good sistance to chemical attacks resistance to chemical attacks ± Good durability Reference: p. 230-239 Calcium Aluminate Cement ajor composition: CA ± Major composition: CA ± High early strength development igh heat of hydration ± High heat of hydration ± Hydrates/Hardens in cold temperatures ydration product is unstable under high ± Hydration product is unstable under high temperature/humidity conditions. It will undergo porosity increase and strength loss Reference: p. 243-246 Question 2 ± Define pozzolan and give typical examples of both natural and by roduct pozzolans List the possible product pozzolans.
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CE165 – Midterm Review - This review covers:...

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