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近年来,商品砼在很多国家的发展势如破竹,除去其它原因之外,一个很重要的原因是可以利用一些先进的施工工艺进一步提高砼的质量,降低成本,二次投料法就是其中一项主要的施工工艺。二次投料法包括水泥裹砂法,预拌水泥砂浆法和预拌水泥浆法。现以其中主要的水泥裹砂法为例进行分析。使用这种方法制备的砼有以下特点: 1.砼质量好,省水泥。因此自日本1979年研制成功此种砼以来,受到各国的极大关注。大成建设株式会社将此种砼与一次投料
In recent years, the development of commodity markets in many countries is in vain. In addition to other reasons, an important reason is that some advanced construction techniques can be used to further improve the quality of helium and reduce costs. The secondary feeding method is one of the major factors. Construction process. The secondary feeding method includes a cement sand dressing method, a ready-mixed cement mortar method, and a ready-mixed cement slurry method. The main cement sand-binding method is now taken as an example for analysis. The crucibles prepared using this method have the following characteristics: 1. The quality of the crucible is good and the cement is saved. Therefore, since Japan successfully developed this type of helium in 1979, it has received great attention from various countries. Daesung Construction Co., Ltd