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砼二次投料法(这里指裹砂法)是从国外引进的新工艺,操作简便,不需要增加什么投资,只需改变一下传统的投料方法,就能获得提高砼强度和节约水泥的明显效果,弥补了常规拌合料的不足。裹砂法的投料顺序如下。先将全部砂子和20～30%水泥重量的水加入搅拌机内搅拌10～15s,砂子表面达到充分滑润,然后投放水泥搅拌15～35s,使砂子颗粒表面粘有水泥,形成一个水泥外壳,接着将全部石子、剩余的水、附加剂一起加进去,再搅拌35～45s;糊化搅拌后即可出料。
The second batch feeding method (herein referred to as the sand wrapping method) is a new process imported from abroad, and is simple in operation, and does not require any additional investment. Only by changing the traditional feeding method, the concrete strength can be improved and the cement can be saved. Make up for the lack of conventional mixing materials. The sand loading method is as follows. First all the sand and 20 to 30% of the cement weight of water into the mixer to stir 10 ~ 15s, the sand surface is fully smooth, and then put the cement to stir 15 ~ 35s, so that the surface of the sand particles cement, forming a cement shell, then All the stones, the remaining water, and additives are added together and stirred for another 35 to 45 seconds. After stirring, the materials can be discharged.