石灰石粉复合粉煤灰水泥的制备及对混凝土性能影响

采用石灰石粉和Ⅲ级粉煤灰作为混合材制备复合水泥,通过粉煤灰和石灰石粉的复合比例和掺量来优化水泥性能,并用所制备的水泥配制混凝土,研究其对混凝土强度和抗裂性能的影响。结果表明:随着石灰石粉掺量的增加,复合水泥的标准稠度用水量明显下降,饱和掺量点提前,对外加剂的适应性表现良好;粉煤灰和石灰石粉的复合比例在7:3～6:4,混合材掺量为20%～40%时,可以配制出42.5和32.5的复合硅酸盐水泥;自制复合水泥所配制混凝土的工作性和强度与重庆涪陵腾辉生产的水泥差别不大,裂缝数目和面积减少,抗裂性明显改善。

Preparation of Limestone Powder Composite Fly Ash Cement and Influence on Concrete Performance

Limestone powder and Ⅲ grade fly ash are mixed to prepare composite cement. Through changing the compound proportion and mixing amount of fly ash and limestone powder to optimize the performance of cement, and using self-made cement to prepare cnncrete, the influence on concrete＇s strength and crack resistance can be got. The results indicate that with the increasing of limestone powder, standard consistency water of composite cement decreases obviously, saturated mixing amount point advances and it is well-adapted to admixture. When the compound proportion of fly ash and limestone powder is 7：3 - 6：4, and the mixing amount is 20% - 40%, composite portland cement of 42.5 and 32.5 can be prepared. The workahility and strength of self-made composite cement has a small different with the cement produced by Chongqing Peiling Tenghui, and the number and size of crack reduce, which means crack resistance improues a lot.