Construction Materials

61) Which of the following mortar is most suitable for construction work in water- logged areas?

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cement mortar

62) Gypsum consists of

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CaS04 and H20

63) After storage, the strength of cement

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decreases

64) Early attainment of strength in rapid hardening cement is mainly due to

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finer grinding

65) The constituent of cement which is responsible for all the undesirable properties of cement is

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tricalcium aluminate

66) The main constituent of cement which is responsible for initial setting of cement is

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tricalcium aluminate

67) Quick lime is

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calcium oxide

68) The crushing strength of a stone depends upon its

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both (a) and (b)

69) Pick up the odd one from the rest

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marble powder

70) The common type of stone used for railway ballast is

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basalt or trap granite

Subject Notes

Objective Box

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