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Question

In Bogues compounds, the main characteristic role of C2S is ________

A
high heat of hydration
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B
low heat of hydration
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C
initial setting of cement
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D
early strength development
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Solution

The correct option is B low heat of hydration
The main characteristic role of C2S is low heat of hydration.
(1) Tricalcium silicate (C3S) (25 - 50 %) - Normally 40%
Best cementing material and is well burnt
It is responsible for early hardness and strength, mainly 7 days of strength.
(2) Dicalcium silicate (C2S)(2540
It is responsible for ultimate strength.
It imparts resistance to chemical attack.
(3) Tricalcium Aluminate (C3A)
It rapidly reacts with water and is responsible for flash set.
Mainly responsible for the initial setting.
(4) Tetracalcium Alumino ferrite C4AF) Poorest cementing value.

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