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在任何水泥混凝土路面工程中使用外加剂一定要注意其与所用水泥的适应性问题,减水剂性能均是在基准水泥、标准温度和标准砂石料的基础上测出的。当采用当地的水泥和砂石料时,性能会有很大的变化,有的减水剂的减水率可能远高于规范中的数据,有的则可能根本不减水反而增加单位用水量,甚至出现假凝现象。一等品外加剂,也存在适应和不适应问题,这是外加剂使用技术中的最大难点和关键技术所在。国内很多公路水泥混凝土路面工程即使有外加剂也不使用,因为用外加剂需要承担风险,这是外加剂在混凝土路面中推广不开的重要原因之一。
The use of admixtures in any cement concrete pavement must pay attention to its compatibility with the cement used, performance of the water reducer are measured on the basis of the standard cement, standard temperature and standard aggregate. When the use of local cement and aggregate, the performance will have a great change, and some water-reducing agent may be much higher than the water reduction in the data in the norms, while others may not increase the water instead of increasing unit water consumption, Even pseudo-coagulation phenomenon. First-class admixture, there are also adapt and not adapt to the problem, which is the admixture of the most difficult technical and key technology lies. One of the most important reasons why admixtures can not be promoted in concrete pavement is that even admixtures are not used in many domestic highway cement concrete pavement projects because the admixtures need to bear the risk.