Which of the following is responsible for the strength anddurability of hydrated cement?
(a) CH(b) Ettringite(c) C-S-H (d) All Â
Usually pozzolanic cement replacement materials react with:
C3S(b) C-S-H(c) CH(d) C2S
Compaction of concrete results in removal of:
Free water(b) Entrained air(c) Entrapped air(c)All Â
Ultrasonic pulse velocity test is used for determining …….. ofconcrete:
Strength(b) Hardness(c) Durability (d) Cracks
Air-entraining agent is used in concrete mainly for:
Corrosion resistance  (b) Freeze-thaw resistance (c)Better workability (d) Less Strength
Which type of ASTM cement is suitable for urgent repairwork?
Type II(b) Type III(c) Type IV(d) Type V
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