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