While adopting hand mixing of concrete, the extra cement to be added is
2.5%
3%
5%
10%
The main undesirable properties of concrete are:
i) Undergoes shrinkage
ii) Requires careful attention during manufacturing, placing, and curing
iii) Has lower tensile strength
iv) For equal load, cement members are heavier than steel members
i and iv only
i, ii, and iv only
i, ii, iii, and iv
ii, iii, and iv only
During the manufacturing process of the Portland cement, gypsum is added to
decrease the rate of setting of cement
increase the tensile strength of cement
bind the particles of calcium silicate
facilitate the formation of colloidal gel
According to IS Code provisions, minimum compressive strength of heavy-duty bricks required for masonry in heavy engineering works such as bridge structures and industrial foundations is
25 MPa
30 MPa
35 MPa
40 MPa
The compound which is responsible for early strength of concrete is
