粒化高炉矿渣粉替代量对偏高岭土基地质聚合物力学性能及凝结时间影响的研究

偏高岭土基地质聚合物在常温养护下具有抗压强度低、凝结时间长等缺点。本文使用GGBS(粒化高炉矿渣粉)等质量替代偏高岭土,研究常温养护下不同GGBS替代量对偏高岭土基地质聚合物抗压强度和凝结时间的影响。本研究首先通过测试不同水玻璃模数对偏高岭土基地质聚合物抗压强度的影响,确定了最佳水玻璃模数;然后,控制最佳水玻璃模数不变,通过测试偏高岭土基地质聚合物的凝结时间和抗压强度,确定了GGBS的最佳替代量范围。研究结果表明,GGBS等质量替代偏高岭土可以缩短地质聚合物的凝结时间,还可以大幅度增加其抗压强度。本文确定了水玻璃的最佳模数为1.3,在此基础上的GGBS最佳替代量为20%至30%。

The effects of GGBS and Modulus of water glass on the hardening behavior of metakaolin based geopolymer under normal temperature curing

Metakaolin-based geopolymers have the disadvantages of low compressive strength and long setting time under room temperature curing. In the present study, GGBS (Ground granulated blastfurnace slag) was utilized to replace the metakaolin, and the effect of different GGBS replacements on the compressive strength and setting time of the geopolymer under normal temperature curing was investigated. The optimal modulus of water glass was determined at first by testing the effect of different modulus of water glass on the compressive strength of metakaolin-based geopolymer. Then, keeping the optimal modulus of water glass unchanged, the optimal range of replacement for GGBS was determined by testing the setting time and compressive strength of metakaolin-based geopolymers. The results show that GGBS can decrease the curing period and significantly increase the compressive strength of the geopolymers. The optimal modulus of water glass is 1.3, and the optimal range of GGBS is 20% to 30%.