Concrete Technology Questions and Answers – Water Proofing Admixtures

This set of Concrete Technology Multiple Choice Questions & Answers (MCQs) focuses on “Water Proofing Admixtures”.

1. What is water proofing admixtures?
a) Water repellent materials
b) Water fair material
c) Water absorption material
d) Water adsorption material
View Answer

Answer: a
Explanation: Water proofing admixtures are available in powder, paste or liquid form and may consist of pore filling or water repellent materials.

2. Water proofing admixtures are available in powder, paste or liquid and gaesous form.
a) True
b) False
View Answer

Answer: b
Explanation: Water proofing admixtures are available in powder, paste or liquid form. It won’t be available un gaseous form.

3. Which one is not a chemically active pore filling material?
a) Silicate of soda
b) Aluminium
c) Chalk
d) Zinc
View Answer

Answer: c
Explanation: Chemically active pore filling materials: silicate of soda, aluminium, zinc sulphates and calcium chloride.
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4. Which one is not a chemically inactive pore filling material?
a) Aluminium
b) Chalk
c) Talc
d) Fullers earth
View Answer

Answer: a
Explanation: Chemically inactive filling material: chalk, fullers earth and talc. And aluminium is active filling material.

5. Chemically active pore fillers __________ the setting of concrete.
a) Retards
b) Decrease
c) Accelerates
d) No change
View Answer

Answer: c
Explanation: Chemically active pore fillers accelerate the setting of concrete and thus render the concrete more impervious at early age.

6. Chemically inactive pore fillers __________ the workability.
a) Decrease
b) Increase
c) Don’t affect
d) Improve
View Answer

Answer: d
Explanation: Chemically inactive pore fillers improve the workability and to facilitate the reduction of water for given workability and to make dense concrete which is basically impervious.

7. Water repelling materials like soda, potash soaps, etc make the concrete pervious.
a) True
b) False
View Answer

Answer: b
Explanation: Water repelling materials like soda, potash soaps, calcium soaps, waxes, fats, vegetable oils repel water and make the concrete impervious.
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8. Entrapped air normally exists in the form of relatively __________ air voids.
a) Small
b) Absent
c) Large
d) Medium
View Answer

Answer: c
Explanation: Entrapped air normally exists in the form of relatively large air voids, which are not dispersed uniformly throughout the mix, entrained air exists in the form of minute disconnected bubbles well distributed throughout the mix.

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.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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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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