Building Materials
Which of the following cements contains maximum percentage of dicalcium silicate?

Low heat cement
Rapid hardening cement
Sulphate resisting cement
Ordinary Portland cement

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

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