Building Materials
The constituent of cement which is responsible for all the undesirable properties of cement is

Tri-calcium silicate
Tetra calcium alumino ferrite
Tri-calcium aluminate
Di-calcium silicate

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Building Materials
The basic purpose of a retarder in concrete is

To increase the initial setting time of cement paste in concrete
To render the concrete more water tight
To improve the workability of concrete mix
To decrease the initial setting time of cement paste in concrete

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