目前,混凝土据不完全统计年产量已高达近二亿m~3,而水泥的产量确远远不能满足工程建设的需要,现已成为影响工程建设的重要原因之一,为此国家计委在一九八六年召开的“全国工程建设节约水泥经验会”上已明确指出在混凝土中掺用减水剂是节约水泥用量的最有效的办法之一,并要求在“七五”计划期间实现掺减水剂的混凝土量达到40%,重点工程达到70%。而目前我国 At present, according to incomplete statistics, the annual concrete output has reached nearly 200 million cubic meters, and the output of cement is far from enough to meet the needs of the project construction. Now it has become one of the important reasons that affect the construction of the project. For this reason, the State Planning Commission The “National Experience on Cement Saving in Cement Construction” convened in 1986 clearly stated that the use of water reducer in concrete is one of the most effective ways to save cement consumption, and it is required to be realized during the “Seventh Five-Year Plan” period. The amount of concrete mixed with water-reducing agent reached 40%, and the key project reached 70%. At present, our country