Homework 4

Homework 4 - Homework 4 1. Affect 7-day mortar cube...

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Homework 4 1. Affect 7-day mortar cube strength - fc questionable water > 90% fc distilled water Impurities that we need to control include chlorides, carbonates and bicarbonates, sulfate, salts, sea water, sugar, and oils. 2.   ASTM Classifications: defined based on the amounts of cement compounds and degree of fineness. o Type I: General Purposes (100%, 7-day base) o Type II: Moderate Sulfate Resistance Less heat of hydration (80-85%) o Type III: High Early Strength (150%) o Type IV: Low Heat of Hydration (40-60%) o Type V: High Sulfate Resistance (60-75%) 3. Air entrainment agents are used to increase resistance to freeze/thaw damage. 4.
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A. Retarders o Benefits slow down the rate of setting Offset high temps Delay initial set for special finishing Somewhat water reducing o Drawbacks some early strength loss B. Accelerators Benefits Accelerate the time it takes for concrete to set Drawbacks Increase drying shrinkage and corrosion risk May discolor concrete
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This note was uploaded on 06/22/2009 for the course CM 3400 taught by Professor Hassan during the Spring '09 term at LSU.

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Homework 4 - Homework 4 1. Affect 7-day mortar cube...

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