1. A ________ paste structure undergoes ________ creep.
a) Good, high
b) Poor, high
c) Good, average
d) Poor, low
Explanation: The amount of paste content and its quality is one of the most important factors influencing creep. A poorer paste structure undergoes higher creep.
2. Creep is _________ to the strength of concrete.
a) Equal
b) Similar
c) Directly proportional
d) Inversely proportional
Explanation: Creep increases with increase in water/cement ratio. In other words, it can also be said that creep is inversely proportional to the strength of concrete
3. The rate of creep rapidly ________ with time.
a) Increase
b) Decrease
c) Doesn’t affect
d) Depends on the temperature
Explanation: The rate of creep rapidly decreases with time. The time taken by a concrete structure to attained creep is 5 years
4. The rate of creep generally _________ with the _________ of the size of aggregates.
a) Increase, increase
b) Decrease, decease
c) Increase, decrease
d) 2.5, 12mm
Explanation: The rate of creep generally decreases with the increase of the size of aggregates.
5. Static modulus of elasticity of concrete has been related to its ___________
a) Tensile strength
b) Compressive strength
c) External strength
d) Applied force
Explanation: Static modulus of elasticity of concrete has been related to its compressive strength by the various Standards.
6. How many types of shrinkages, caused due to loss of water?
a) 1
b) 2
c) 3
d) 4
Explanation: There are 3 types of shrinkage that are caused due to loss of water i.e. plastic, drying and autogenous.
7. Reduction in the volume due to shrinkage causes ____________
a) Low volume
b) Volumetric strain
c) Volumetric stress
d) W/c ratio
Explanation: Reduction in the volume due to shrinkage causes volumetric strain in freshly hardened concrete.
8. Volumetric strain is equal to ___________ times the linear strain.
a) 1
b) 2
c) 3
d) 4
Explanation: Volumetric strain is equal to 3 times the linear strain in freshly hardened concrete.
9. In practice, shrinkage is measured simply as a ____________
a) Linear strain
b) Linear stress
c) Volumetric strain
d) Volumetric stress
Explanation: In practice, shrinkage is measured simply as a linear strain in freshly hardened concrete.
10. Shrinkage in concrete is caused mainly by a loss of water by evaporation or by hydration of cement.
a) True
b) False
Explanation: Shrinkage in concrete is caused mainly by a loss of water by evaporation or by hydration of cement.