A. reduces the strength
B. increases the strength
C. does not change the strength
D. all of the above
0
The relation between modulus of rupturefcr and characteristic strength of concrete fck is given by_______________?
0
The approximate value of the ratio between direct tensile strength and flexural strength is_____________?
A. fcr=0.35Vf7
B. fcr=0.57f7
C. fcr=0.7Vf7
D. fcr=1.2Vf7
where fcr and fck are in N/mm2′
0
Air entrainment in the concrete increases________________?
A. 0.33
B. 0.5
C. 0.75
D. 1.0
0
Workability of concrete is inversely pro¬portional to______________?
A. workability
B. strength
C. the effects of temperature variations
D. the unit weight
0
The property of fresh concrete, in which the water in the mix tends to rise to the surface while placing and compacting, is called________________?
A. time of transit
B. ‘vater-cement ratio
C. the air in the mix
D. size of aggregate
0
To determine the modulus of rupture, the size of test specimen used is_______________?
A. segregation
B. bleeding
C. bulking
D. creep
0
The percentage of voids in cement is approximately_______________?
A. 150 x150 x500 mm
B. 100 x100 x700 mm
C. 150 x150 x700 mm
D. 100 x100 x500 mm
0
Modulus of rupture of concrete is a measure of_______________?
A. 25%
B. 40%
C. 60%
D. 80%
0
In order to obtain the best workability of concrete, the preferred shape of aggregate is_______________?
A. flexural tensile strength
B. direct tensile strength
C. compressive strength
D. split tensile strength
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