1. humidity of atmosphere
2. passage of time
3. stress
The correct answer is?
A. (1) and (2)
B. (2)and (3)
C. only (3)
D. All (1), (2)and (3)
Related Mcqs:
- Approximate value of shrinkage strain in concrete, is________________?
A. 0.003
B. 0.0003
C. 0.00003
D. 0.03 - In symmetrically reinforced sections, shrinkage stresses in concrete and steel are respectively_______________?
A. compressive and tensile
B. tensile and compressive
C. both compressive
D. both tensile - 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 - Due to shrinkage stresses, a simply supported beam having reinforcement only at bottom tends to_____________?
A. deflect downward
B. deflect upward
C. deflect downward or upward
D. none of the above - The strength of concrete after one year as compared to 28 days strength is about_______________?
A. 10 to 15% more
B. 15 to 20% more
C. 20 to 25% more
D. 25 to 50% more - Admixtures which cause early setting, and hardening of concrete are called_______________?
A. workability admixtures
B. accelerators
C. retarders
D. air entraining agents - 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. segregation
B. bleeding
C. bulking
D. creep - In case of hand mixing of concrete, the extra cement to be added is__________________?
A. 5%
B. 10%
C. 15%
D. 20% - For a reinforced concrete section, the shape of shear stress diagram is_______________?
A. wholly parabolic
B. wholly rectangular
C. parabolic above neutral axis and rectangular below neutral axis
D. rectangular above neutral axis and parabolic below neutral axis - 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
