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Harmful Constituents Of Cement

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Harmful Constituents Of Cement

 

The presence of the following two oxides adversely affects the quality of cement:

(1) Alkali oxides K2O and Na2O

(2) Magnesium oxide MgO.

If the amount alkali oxide exceeds 1 per cent, it leads to the failure of concrete made from that cement. Similarly, if the content of magnesium oxide exceeds 5 per cent, it causes cracks after mortar or concrete hardens. It is due to the fact that magnesium oxide, burned at a temperature of about 1500ºC slakes very slowly, when mixed with water.

 
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