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81. The normal consistency of ordinary Portland cement is about________________?

A. 10%
B. 20%
C. 30%
D. 40%

82. Gypsum consists of______________?

A. H2S and C02
B. CaS04 and H20
C. Lime and H20
D. C02 and calcium

83. For testing compressive and tensile strength of cement, the cement mortar is made by mixing cement and standard sand in the proportions of___________________?

A. 1:2
B. 1:3
C. 1:4
D. 1:6

84. Which of the following cement is suitable for use in massive concrete structures such as large dams?

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

85. The maximum quantity of calcium chloride used as an accelerator in cement in percentage by weight of cement is_______________?

A. 1
B. 2
C. 3
D. 4

86. The most common admixture which is used to accelerate the initial set of concrete is______________?

A. gypsum
B. calcium chloride
C. calcium carbonate
D. none of the above

87. With increase in moisture content, the bulking of sand_______________?

A. increases
B. decreases
C. first increases to a certain maximum value and then decreases
D. first decreases to a certain minimum value and then increases

88. Addition of pozzolana to ordinary Portland cement increases__________________?

A. bleeding
B. shrinkage
C. permeability
D. heat of hydration

89. The slump recommended for mass concrete is about_______________?

A. 25 mm to 50 mm
B. 50 mm to 100 mm
C. 100 mm to 125 mm
D. 125 mm to 150 mm

90. After storage, the strength of cement________________?

A. decreases
B. increases
C. remains the same
D. may increase or decrease

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