McqMate
| Q. |
The addition of gypsum to port-land cement helps in : |
| A. | increasing the strength of cement |
| B. | rapid setting of cement |
| C. | preventing rapid setting of cement |
| D. | reduction in the cost of cement |
| Answer» C. preventing rapid setting of cement | |
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Explanation: Portland cement clinker is a hydraulic material which shall consist of at least two-thirds by mass of calcium silicates, theremainder consisting of aluminium- and iron- containing clinker phases and other compounds. The ratio of CaO to SiO2 shall not be less than 2.0. The magnesium oxide content (MgO) shall not exceed 5.0% by mass. Cement sets when mixed with water by way of a complex series of chemical reactions still only partly understood. |
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