Normal consistency of ordinary Portland cement is about _____ ?
A. 30%
B. 40%
C. 10%
D. 20%
Building Materials and Construction
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After storage, the strength of cement _____ ?
A. may increase or decrease
B. decreases
C. increases
D. remains same
Slump recommended for mass concrete is about ___ ?
A. 100 mm to 125 mm
B. 125 mm to 150 mm
C. 50 mm to 100 mm
D. 25 mm to 50 mm
Addition of pozzolana to ordinary Portland cement increases _____ ?
A. permeability
B. heat of hydration
C. bleeding
D. shrinkage
With increase in moisture content, the bulking of sand ____ ?
A. first decreases to a certain minimum value and then increases
B. first increases to a certain maximum value and then decreases
C. increases
D. decreases
According to IS specifications, the compressive strength of ordinary portland cement after three days should not be less than ____ ?
A. 16 MPa
B. 21 MPa
C. 7 MPa
D. 11.5 MPa
Early attainment of strength in rapid hardening cement is mainly due to _____ ?
A. finer grinding
B. tricalcium aluminate
C. gypsum
D. tricalcium silicate
Which of the following is the purest form of iron ?
A. wrought iron
B. high carbon steel
C. cast iron
D. mild steel
Most commonly used retarder in cement is _____ ?
A. calcium carbonate
B. calcium chloride
C. gypsum
D. None of them
Ultimate tensile strength of structural mild steel is about _____ ?
A. 520 N/mm2
B. 420 N/mm2
C. 160N/mm2
D. 260N/mm2