一种以粉煤灰为主要原料(占63％),掺入少量的水泥熟料(如12％)及外加剂(如用FDN0.3％)等配制成低标号水泥是重庆建筑大学研制的技术成果。该水泥可用来拌制砌筑和抹面砂浆,其砂浆的强度等级为M10、M7.5、M5及M2.5等。配制时所用粉煤灰经磨细。细度为经0.080mm筛余不超过3％(含SiO_2 42.8％、Al_2O_3 24.8％、Fe_2O_3 21.1％等),生石灰含有效钙在70％(用量2.7％)、石膏含SO_3 41.9％(用量4％)以及芒硝、氯化钠用量各 A low-grade cement made of fly ash as the main raw material (63%), a small amount of cement clinker (such as 12%), and an admixture (such as FDN 0.3%) was developed by Chongqing University of Architecture. Technical achievements. The cement can be used to mix masonry and plastering mortars with strength grades of M10, M7.5, M5 and M2.5. The fly ash used in the preparation is finely ground. The fineness is no more than 3% by 0.080mm sieve (42.8% of SiO2, 24.8% of Al_2O_3, 21.1% of Fe_2O_3, etc.). The quick lime contains 70% of effective calcium (2.7% of dosage) and 41% of SO_3 of gypsum (4% of dosage). ) and Glauber’s salt, sodium chloride dosage