用粉煤灰作硅酸盐水泥混合材,我国50年代就开始研究。1978年制定了国家标准。但由于粉煤灰难以计量、运输,掺粉煤灰降水泥标号较多,污染较严重,生产厂经济效益差等原因,生产厂不愿采用。特别是粉煤灰水泥早期强度低,混凝土易离析,建筑单位不好使用。因此,现在全国生产粉煤灰水泥年产量不到水泥总产量的0.3%。 With fly ash as Portland cement admixture, China began research in the 1950s. National standards were established in 1978. However, because fly ash is difficult to measure and transport, there are many labels with fly ash to reduce cement, the pollution is more serious, the economic benefits of the production plant are poor, and the manufacturer is unwilling to adopt it. In particular, the early strength of fly ash cement is low, the concrete is easy to segregate, and the construction unit is not good to use. Therefore, the annual output of fly ash cement produced in the country is less than 0.3% of the total cement output.