Material design for blended cement

水泥行业被要求为可持续社会做出贡献，并要求在水泥生产中增加废物的利用。由于废渣中Al_2O_3的含量高于水泥的组成，为了提高废渣在水泥生产中的利用率，应提高水泥中铝酸盐相的含量。铝酸盐相的增加有可能增加水泥浆体的流动性，降低水泥浆体的水化收缩率。因此，随着水泥中铝酸盐相水泥用量的增加，有必要对水泥配合比进行材料设计。在本研究中，讨论了以下项目。1)基于水化分析的掺合水泥材料设计应考虑的物质安排2)慢冷高炉炉渣的表征3)铝酸盐相的优缺点4)利用外加剂控制C_3A高含量水泥流动性的方法在此基础上提出了今后掺合水泥和普通水泥的材料设计方法。阐明了各种外加剂对水泥胶料反应的影响及其反应。总结了矿物掺合料的化学成分、细度、玻璃性比等在材料设计中应考虑的因素。此外，还讨论了慢冷高炉炉渣的还原效果。水泥中的铝酸盐相对固定有害离子有较好的效果。随着铝酸盐相含量的增加，水泥的流动性降低。当铝酸盐相调整到8%左右或更低时，表明水泥的流动性易于控制。此外，还阐明了矿物掺合料以20-30质量%左右的质量分数来减少铝酸盐相的用量是有效的，作为控制水泥流动性的方法，增加了废料的利用率，增加了铝酸盐相。少

In the cement industry, the contribution to the sustainable society is requested, and it is demanded to increase the usage of waste at cement manufacture. Because the content of Al_2O_3 for wastes is higher than the composition of cement, he contents of aluminates phase of cement should be increased for increasing the utilization amounts of waste disposal in cement production. It is possible that the fluidity of cement paste is increased and the hydration shrinkage of cement paste is decreased by the increasing of aluminate phase. Therefore, it is necessary to arrange the material design of blended cement when the amount of cement of aluminate phase in cement increases. In this study, the following items are discussed.1)Arrangement of matter that should be considered on material design of blended cement based on hydration analysis2)Characterization of slowly cooled blast furnace slag3)Merits and demerits of aluminate phase4)Controlling methods for fluidity of cement with high contents … More of C_3A by using of additivesIt proposed the material design method of blended cement and ordinary cement in the future based on the above-mentioned. The influence of various admixtures on the reaction of the cement compound and the reaction of them were clarified. The factors that had to be considered on the material design of the chemical composition, fineness, and the glassiness ratio etc. of the mineral admixtures were summarized. In addition, the reduction effect of the slowly cooled blast furnace slag was discussed.. The aluminate phase in cement is effective for the immobilization of harmful ions. However, the flowability of cement decreases wit increasing of the contents of aluminate phase. When the aluminate phase was adjusted to about 8% or less, it was clarified that the control of the flowability of cement was easy. In addition, it was clarified that it was effective to decrease the amount of the aluminate phase by using the mineral admixtures by about 20-30 mass% as a controlling method of the flowability of cement that increased the usage of waste, and increased the aluminate phase. Less