Civil Engineering — Concrete Technology Questions & Answers

Civil Engineering — Concrete Technology

Structures, surveying, soil mechanics

3 Questions 10 Topics Take Test

Showing 1–3 of 3 questions in Concrete Technology

Q.1 Hard Concrete Technology

Self-compacting concrete (SCC) must achieve a slump flow of:

A 150-250 mm

B 300-500 mm

C 600-800 mm

D 900-1000 mm

Correct Answer: C. 600-800 mm

EXPLANATION

SCC requires slump flow between 600-800 mm to flow and compact under its own weight without vibration.

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Q.2 Hard Concrete Technology

According to Abrams' Law, the relationship between w/c ratio and compressive strength is:

A Linear positive relationship

B Inverse/Negative exponential relationship

C No relationship

D Directly proportional

Correct Answer: B. Inverse/Negative exponential relationship

EXPLANATION

Abrams' Law states that compressive strength decreases exponentially with increase in water-cement ratio.

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Q.3 Hard Concrete Technology

Which chemical compound in cement causes flash setting when exposed to water?

A C3S (Tricalcium Silicate)

B C2S (Dicalcium Silicate)

C C3A (Tricalcium Aluminate)

D C4AF (Tetracalcium Aluminoferrite)

Correct Answer: C. C3A (Tricalcium Aluminate)

EXPLANATION

C3A reacts rapidly with water and is responsible for flash setting. Gypsum is added to control this reaction.

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