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| 1. |
Mention the main constituents of Portland cement. What is the role of gypsum in it? |
| Answer» Dicalcuim silicate `(26%)`, tricalcuim silicate `(51%)` and tricalcuim aluminate `(11%)`. Gypsum is added to cement to slow down the precess of setting of the cement so that it gets sufficiently hardened. | |