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拌制混凝土通常是将水泥、砂、石混合在一起进行,这称做一次投料。这种投料方法的缺点是,水泥颗粒被砂、石夹裹,遇水后容易形成小水泥团粒。水灰比越小,这种结块现象越严重。水泥团粒附在粗骨料上,骨料粒经越大,越不易破坏。最终以水泥闭粒的形式填充于骨料空隙之中,水泥不能充分水化。结果是降低了混凝土强度,
Mixing concrete is usually cement, sand, stone mixing together, which is called a feed. The disadvantage of this feeding method is that the cement particles sand and stone wrapped, easy to form small water cement particles. The smaller the water-cement ratio, the more serious this agglomeration occurs. Cement particles attached to the coarse aggregate, the larger the aggregate particles, the more difficult to destroy. Finally, the form of cement granules filled in the gap in the aggregate, the cement can not be fully hydrated. The result is a decrease in concrete strength,