Temperature Control of Ingredients:

The temperature at the time of setting of concrete can be raised by heating the ingredients of the concrete mix. Heating of mixing water is easy. The temperature of the water should not exceed 65ºC as the flash set of cement will occur when the hot water and cement come in contact in the mixers. Therefore, the heated water should come in direct contact with the aggregate and the sand first. The aggregates might be heated through passing steam through pipes embedded in aggregate storage bins. The other precaution taken along with the heating of ingredients is to construct a temporary shelter around the construction site. The air inside is heated by electric or steam heating or central heating with circulating water. The temperature of ingredients should be so decided that the resulting concrete sets at a temperature of 10ºC to 20ºC.