In order to improve the mixing effe

In order to improve the mixing effect of concrete in winter construction, the mixer should be preheated before concrete mixing, generally using hot water to wash the mixer, when conditions allow, it is best to wrap the mixer with insulation materials or build a warm shed. When stirring should first join sand stone material and mix water, agitate, join cement again next agitate, cannot mix cement and hot water directly, prevent cement to produce "false coagulate" phenomenon, make concrete workability becomes poor, reduce late strength. The stirring time should be half longer than normal temperature. In the process of mixing, in addition to strictly normal temperature concrete slump, mix ratio inspection, in winter concrete mixing should also be at any time check the mixing temperature and concrete outlet temperature (not less than 12℃).