The raw materials used for mixing c

The raw materials used for mixing concrete in winter construction should be kept at a positive temperature. Generally, the raw materials should be heated appropriately to make the concrete reach the required temperature. Heating raw materials should be given priority to the mixing water heating, because the heat capacity of water is large, heating is also convenient; Then consider sand and gravel heating. Cement, admixture, active mineral admixture can not be heated, should be preserved with a greenhouse.