Pozzolan in cement concrete mix a. Is an accelerator of settin b. Retarder of se

Question

Pozzolan in cement concrete mix a. Is an accelerator of settin b. Retarder of setting c. Cement substitute d. Air entertainment agent Flay Ash C is added to concrete mix: to: a, Reduce unit weight. b, As a cement substitute c. Decrease permeability d.. Increase strength Sugar is added to cement concrete to a. Make concrete to go sleep b. Make concrete sweet c. Reduce setting time d. Make concrete sulphate resistant Super plasticizer is used to a. To reduce cement b. To increase slump c. To reduce the water to be added d. To increase setting time One gallon of water added to one cubic yard of concrete mix wii: a. Decreas slump by One inch b. Increase slump by One inch c. Decrease unit weight by one pcf d. Increase unit weight by One pef One gallon of water added to one cubic yard of concrete wii a. Increase strength by 100 psi b. Decrease strength by 100 psi c. Increase setting time by 10 minutes d. Decrease setting time by 10 minutes Air in a concrete mix is for a. Reduce the unit weight of concrete b. Make it more flexible c. Make it more frost resistance d. Make it more resistant to hot weather Sulphate attack to concrete occurs when a. The concrete is exposed to air containing to sulfur b. The concrete is embedded in soil containing sulfates c. The concrete is submerged in water containing sulfuric acid d. Natural aging in toxic environment Cement concrete is stronger than AC: a) True b) False Cement concrete is more flexible than AC a) False b) True

Explanation / Answer

1. Ans- c. Cement Substitute

2. Ans - b. As a cement substitute

3. Ans - a. make concrete go to sleep (basically it increases the setting time and thus is a retarder)

4. Ans - b. increase the slump.

5. Ans - b. increases the slump by 1 inch.

6. Ans - c. increase the setting time by 10 mins.

7. Ans - a. Reduce the unit weight of concrete.

8. Ans- b. The concrete is embedded in soil containing sulfates.

9. Ans - a True.

10. Ans - a. False (AC is more flexible than concrete)

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