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Q.

An aqueous paste of portland cement sets to a hard mass due to

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a

hydration of the molecules of constituents

b

rearrangement of molecules of constituents

c

both (1) and (2)

d

evaporation of water only

answer is C.

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Detailed Solution

cement is mixed with water, the paste becomes rigid within a short time which is known as initial setting. This is due to the hydration of tricalcium aluminate and gel formation of tetra calcium alumino ferrite
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