1. to increase shrinkage
2. to decrease shrinkage
3. to increase setting time
4. to decrease setting time
The correct answer is?
A. (1) and (3)
B. (1)and(4)
C. (2)and (3)
D. (2)and (4)
Related Mcqs:
- Minimum grade of concrete to be used in reinforced concrete as per IS:456-1978 is_____________?
A. M15
B. M20
C. M 10
D. M25 - Approximate value of shrinkage strain in concrete, is________________?
A. 0.003
B. 0.0003
C. 0.00003
D. 0.03 - According to IS : 456-1978, the fiexural strength of concrete is________________?
A. directly proportional to compressive strength
B. inversely proportional to compressive strength
C. directly proportional to square root of compressive strength
D. inversely proportional to square root of compressive strength - The purpose of reinforcement in prestressed concrete is________________?
A. to provide adequate bond stress
B. to resist tensile stresses
C. to impart initial compressive stress in concrete
D. all of the above - Strength of concrete increases with________________?
A. increase in water-cement ratio
B. increase in fineness of cement
C. decrease in curing time
D. decrease in size of aggregate - Admixtures which cause early setting, and hardening of concrete are called_______________?
A. workability admixtures
B. accelerators
C. retarders
D. air entraining agents - The relation between modulus of rupturefcr and characteristic strength of concrete fck is given by_______________?
A. fcr=0.35Vf7
B. fcr=0.57f7
C. fcr=0.7Vf7
D. fcr=1.2Vf7
where fcr and fck are in N/mm2′ - 1% of voids in a concrete mix would reduce its strength by about______________?
A. 5%
B. 10 %
C. 15%
D. 20% - According to Whitney’s theory, ultimate strain of concrete is assumed to be_____________?
A. 0.03%
B. 0.1%
C. 0.3%
D. 3% - Cube strength of controlled concrete to be used for pretensioned and post-tensioned work respectively should not be less than__________________?
A. 35 MPa and 42 MPa
B. 42 MPa and 35 MPa
C. 42 MPa and 53 MPa
D. 53 MPa and 42 MPa
