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61.

Tricalcium silicate develops strength in cement for first 7 days.

Yes

62.

Which of the following statement is correct?

A.	The high early strength is obtained by adding tricalcium silicate in cement.	B.	The dicalcium silicate provides good ultimate strength to cement.
C.	The tetra calcium alumino ferrite has poor cementing value.	D.	all of the above

63.

The sum of the percentage of tricalcium silicate and dicalcium silicate for Portland cement varies from

A.	50 to 60%	B.	60 to 70%
C.	70 to 80%	D.	80 to 90%

64.

Ordinary Portland cement should not be used for construction work exposed to sulphates in the soil.

Agree

Disagree

65.

The rate of hydration is

directly

inversely

66.

Rapid hardening cement is used

A.	where high early strength is desired	B.	where form work is to be removed as early as possible
C.	for constructing road pavements	D.	all of the above

67.

Low heat cement is used in

thin

thick

68.

The cement, widely used in retaining walls, is

A.	rapid hardening cement	B.	low heat cement
C.	sulphate resisting cement	D.	ordinary Portland cement

69.

Blast furnace slag cement is used for

A.	dams	B.	bridge abutments
C.	retaining walls	D.	all of these

70.

Blast furnace slag cement concrete requires

less