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3501r4 - CGN 3501 REVIEW QUESTIONS FOR TEST NO 2 Fall 2010...

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1 CGN 3501 REVIEW QUESTIONS FOR TEST NO. 2 Fall 2010 Concrete Mix Design 1. Know how to perform a concrete mix design on paper according to the ACI (Absolute Volume) method. You should know the specific gravity of cement and density of water by heart. 2. How do we verify or make the necessary adjustments in a concrete mix design? Admixtures 1. What are the effects of 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 is kept the same? Explain why air entrainment in concrete can improve its durability. 2. What are the effects of the following admixtures on the properties of fresh and hardened concrete, if the proportioning of the other mix ingredients are kept the same? (A) Water reducing admixture (B) Accelerating admixture (C) Retarding admixture (D) Gas forming admixture (E) Corrosion inhibitor (F) Fly ash (G) Ground blast-furnace slag
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