6505r7 - cement in concrete? 7. What are the possible...

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CGN 6505 Review Questions Set No. 7 Spring 2010 ADMIXTURES 1. What is the definition of "Admixture" according to ASTM C125? 2. What does an air-entraining admixture typically consist of? How does it usually work in entraining air in a concrete? 3. What are the effects of an air-entraining admixture on (A) the workability of fresh concrete, (B) the strength of hardened concrete, (C) the density of hardened concrete, and (D) the durability of hardened concrete, if the proportioning of the other mix ingredients are kept the same? Explain why air entrainment in concrete can improve its durability. 4. What does a water-reducing admixture typically consist of? How does it usually work in improving the workability of a fresh concrete? 5. What are the differences between (a) a water-reducing admixture, (b) a high-range water- reducing admixture, and (c) a plasticizing admixture? What are the possible benefits from the use of these admixtures? 6. How do set-control admixtures usually work in retarding or accelerating the hydration rate of
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Unformatted text preview: cement in concrete? 7. What are the possible applications of a retarding admixture? 8. What are the possible applications of an accelerating admixture? 9. What are the effects of addition of calcium chloride on properties of fresh and hardened concrete? 10. Describe the three classes of pozzolanic materials as defined in ASTM C 618. 11. Describe the particle shape, size, fineness, specific gravity and composition of fly ash. 12. Describe the three different grades of ground granulated blast-furnace slag as defined in ASTM C989. 13. Describe the particle shape, size, fineness, specific gravity and composition of silica fume. Why is silica fume a more effective pozzolanic material than fly ash or ground blast-furnace slag? 14. Describe the applications of fly ash, blast-furnace slag and silica fume admixtures in concrete. 15. Describe a corrosion inhibitor admixture. 16. Describe gas forming admixture....
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This note was uploaded on 05/26/2011 for the course CGN 6505 taught by Professor Mang during the Spring '11 term at University of Florida.

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6505r7 - cement in concrete? 7. What are the possible...

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