Concrete Technology Questions and Answers – Types of Shrinkage

This set of Concrete Technology Multiple Choice Questions & Answers (MCQs) focuses on “Types of Shrinkage”.

1. What is plastic shrinkage?
a) It is not a result of any change in the concrete production process. Rather, it is a result of certain environmental conditions which occurs in the Central Missouri area
b) It is defined as the contracting of a hardened concrete mixture due to the loss of capillary water. This shrinkage causes an increase in tensile
c) It is an important phenomenon in young concrete. At low w/c ratios, less than about 0.42, all the water is rapidly drawn into the hydration process and the demand for more water creates very fine capillaries
d) It occurs when the concrete is exposed to air containing carbon dioxide
View Answer

Answer: a
Explanation: It is not a result of any change in the concrete production process. Rather, it is a result of certain environmental conditions which occurs in the Central Missouri area.

2. What is drying shrinkage?
a) It is not a result of any change in the concrete production process. Rather, it is a result of certain environmental conditions which frequently occur in the Central Missouri area
b) It is defined as the contracting of a hardened concrete mixture due to the loss of capillary water. This shrinkage causes an increase in tensile
c) It is an important phenomenon in young concrete. At low w/c ratios, less than about 0.42, all the water is rapidly drawn into the hydration process and the demand for more water creates very fine capillaries
d) It occurs when the concrete is exposed to air containing carbon dioxide
View Answer

Answer: b
Explanation: It is defined as the contracting of a hardened concrete mixture due to the loss of capillary water. This shrinkage causes an increase in tensile.

3. What is autogenous shrinkage?
a) It is not a result of any change in the concrete production process. Rather, it is a result of certain environmental conditions which frequently occur in the Central Missouri area
b) It is defined as the contracting of a hardened concrete mixture due to the loss of capillary water. This shrinkage causes an increase in tensile
c) It is an important phenomenon in young concrete. At low w/c ratios, less than about 0.42, all the water is rapidly drawn into the hydration process and the demand for more water creates very fine capillaries
d) It occurs when the concrete is exposed to air containing carbon dioxide
View Answer

Answer: c
Explanation: It is an important phenomenon in young concrete. At low w/c ratios, less than about 0.42, all the water is rapidly drawn into the hydration process and the demand for more water creates very fine capillaries.
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4. What is carbonation shrinkage?
a) It is not a result of any change in the concrete production process. Rather, it is a result of certain environmental conditions which frequently occur in the Central Missouri area
b) It is defined as the contracting of a hardened concrete mixture due to the loss of capillary water. This shrinkage causes an increase in tensile
c) It is an important phenomenon in young concrete. At low w/c ratios, less than about 0.42, all the water is rapidly drawn into the hydration process and the demand for more water creates very fine capillaries
d) It occurs when the concrete is exposed to air containing carbon dioxide
View Answer

Answer: d
Explanation: It occurs when the concrete is exposed to air containing carbon dioxide.

5. ACI 305.R.91 specifies Evaporation rate __ kg/hr/m2 should be avoided to prevent plastic cracking.
a) <.5
b) =0.5
c) >.5
d) Not equal to .5
View Answer

Answer: c
Explanation: ACI 305.R.91 specifies Evaporation rate >0.5 kg/hr/m2 should be avoided to prevent plastic cracking.

6. Carbonic Acid + Ca(OH)2 ⇨ X. What is the main compound in X?
a) CaCO2
b) CO2
c) CaCO3
d) H2O
View Answer

Answer: c
Explanation: It is a chemical reaction. It causes contraction of concrete which is known as Carbonation shrinkage.

7. If there is continuous supply of H2O to the concrete during hydration, concrete expands due to absorption of water by the cement gel.
a) True
b) False
View Answer

Answer: a
Explanation: If there is continuous supply of H2O to the concrete during hydration, concrete expands due to absorption of water by the cement gel and it is known as swelling.
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8. Reduction in the volume due to shrinkage causes _____
a) Low volume
b) Volumetric strain
c) Volumetric stress
d) W/c ratio
View Answer

Answer: b
Explanation: Reduction in the volume due to shrinkage causes volumetric strain in freshly hardened concrete.

Sanfoundry Global Education & Learning Series – Concrete Technology.

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To practice all areas of Concrete Technology, here is complete set of 1000+ Multiple Choice Questions and Answers.

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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