Do you need air-entraining admixture a yes b no c I can but not required d I don

Question

Do you need air-entraining admixture a yes b no c I can but not required d I don't know Slump should be between (minimum and maximum limits in mm) a 25-75 b 25-100 c 25-50 d 50-100 Slump value chosen for your calculation a 25 b 75 c 50 d 100 Water demand for 1 unit volume of concrete (aggregate moisture not taken into consideration) a 150 b 125 c. 106.25 d102.5 Air content a 6% b 4.5% c 5.5% d 2.5% Required strength is a 30Mbps b 37 Mpa c 38.5 Mpa d 38 Mpa Water cement ratio is a 0.49 b 37 c 39 d 40 Cement content per unit volume of concrete a 287 kg b 277 kg c 226kg d 256 kg Bulk volume of dry rodded coarse aggregate per 1 m3 concrete a 0.69 b 0.67 c0.73 d 0.71

Explanation / Answer

1) Yes. Air entraining admixtures create stable bubble while mixing the concrete.

2)25-100. 25 means low workable. 100 means high workable.

3) 50. Gives the good workable conditions.

4) 125 is the good water content for 1unit of concrete to attain strength.

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