Agents - Concrete Technology Questions and Answers

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

1. What is the content of SiO₂ in fly ash?
a) 30-60%
b) 15-30%
c) Up to 30%
d) 1-7%
View Answer

Answer: a
Explanation: The content of SiO2 in fly ash has been tested according to procedures specified in IS: 1727-1967.

2. What is the content of Al₂O3 in fly ash?
a) 30-60%
b) 15-30%
c) Up to 30%
d) 1-7%
View Answer

Answer: b
Explanation: The content of Al₂O3 in fly ash has been tested according to procedures specified in IS: 1727-1967.

3. What is the content of unburnt fuel in fly ash?
a) 30-60%
b) 15-30%
c) Up to 30%
d) 1-7%
View Answer

Answer: c
Explanation: The content of unburnt fuel in fly ash has been tested according to procedures specified in IS: 1727-1967.

4. Air entrainment in concrete increases ___________
a) Strength
b) Workability
c) The effect of temp variations
d) The unit weight
View Answer

Answer: b
Explanation: There are the following types of Air entrainment in concrete which helps to increase the workability.

5. Find the odd one out.
a) Clay and shales
b) Opalinccherts
c) Diatomaceous earth
d) Surkhi
View Answer

Answer: d
Explanation: Clay and shales, opalinccherts, diatomaceous earth are natural pozzolnanas and surkhi is artificial one.

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6. Find the odd one out.
a) Fly ash
b) Silica Fume
c) Rice husk ash
d) Volcanic tuffs
View Answer

Answer: d
Explanation: Fly ash, silica fume, rice husk ash are artificial pozzolnanas and Volcanic tuffs are the natural one.

7. Find the odd one out.
a) Finely divided minerals
b) Air entraining agents
c) Synthetic derivatives
d) Natural derivatives
View Answer

Answer: d
Explanation: Finely divided minerals, Air entraining agents, Synthetic derivatives are the types of plasticizers.

8. Find the odd one out.
a) Water reducing plasticizers
b) Water reducing plasticizers
c) High performance plasticizers
d) Super plasticizers
View Answer

Answer: d
Explanation: Water reducing plasticizers, Water reducing plasticizers, High performance plasticizers are the types of plasticizers available in India.

9. Which one is not chemical admixtures?
a) Accelerators
b) Retarders
c) Water-reducing agents
d) Silica fume
View Answer

Answer: d
Explanation: Accelerators, retarders, water reducing agents are the chemical admixtures and silica fumes is mineral admixtures.

10. Which one is not part of chemical and mineral admixtures?
a) Curing compounds
b) GGBFS
c) Metakaoline
d) Pumicites
View Answer

Answer: a
Explanation: GGBFS and Metakaoline are mineral admixtures and Pumicites is the artificial admixtures.

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