据说,古罗马人在修建城堡时,曾经把牛血之类的东西加入火山灰里作建筑材料。但在近代水泥发明以后,却禁止向混凝土中添加任何物质,尤其不准加入有机物质。到了本世纪30年代,由于偶然的机会才发现外加物能改变混凝土的性能。此后,对外加剂的研究和使用日渐广泛,各国纷纷制订外加剂应用规程,专门生产外加剂的工厂也应运而生。在混凝土中加了外加剂后,能节约水泥,方便操作,缩短工期,降低成本,是一项使用 It is said that when the ancient Romans built the castle, they used to add things like cow blood into the volcanic ash as building materials. However, after modern cement was invented, it was forbidden to add any substances to the concrete, especially the addition of organic substances. By the 1930s, it was discovered by chance that the additions could change the performance of the concrete. Since then, the research and use of admixtures has become increasingly widespread. Various countries have formulated application procedures for admixtures, and factories specializing in the production of admixtures have also emerged. Adding admixtures to the concrete can save cement, facilitate operation, shorten the construction period, and reduce costs. It is a use.