矿渣-电石渣基地质聚合物的性能及作用机制

摘要/Abstract

摘要： 以粒化高炉矿渣为主要材料,在碱性电石渣激发作用下,制备了一种矿渣-电石渣基地质聚合物。通过XRD、SEM、EDS、FTIR、TG-DSC等微观测试技术,对矿渣-电石渣基地质聚合物的性能及作用机制进行了分析,同时对地质聚合物进行了重金属浸出测试。结果表明:当外掺电石渣质量分数为14%、水胶比为0.34时,矿渣-电石渣基地质聚合物在4 d常温养护、32 h蒸汽养护环境下抗压强度达到31.8 MPa;地质聚合物的水化产物主要为水化硅铝酸钙、水化碳铝酸钙和少量钙钒石晶体;浸出液中重金属浓度均满足国家毒性控制标准,说明了地质聚合物的安全性;电石渣对矿渣碱激发作用效果良好。

关键词: 矿渣, 电石渣, 地质聚合物, 碱激发, 蒸汽养护, 微观组成, 重金属浸出, 作用机制

Abstract: With ground granulated blast furnace slag as the main material, a slag-carbide slag based geopolymer was prepared under the excitation of alkaline carbide slag. Through XRD, SEM, EDS, FTIR, TG-DSC and other microscopic testing techniques, the performance and action mechanism of the slag-carbide slag based geopolymer were analyzed, and the heavy metal leaching test was carried out for the geopolymer. The results show that when the mass fraction of carbide slag is 14% and the water to cementitious material is 0.34, the compressive strength of the slag-carbide slag based geopolymer is 31.8 MPa under the condition of 4 d ambient temperature curing and 32 h steam curing. The hydration products of geopolymer are mainly calcium aluminosilicate hydrate, calcium carboaluminate hydrate and a small amount of ettringite crystals. The concentration of heavy metals in the leaching solution meets the national toxicity control standard, indicating the safety of geopolymer. Carbide slag has good effect on alkali activation of slag.

Key words: slag, carbide slag, geopolymer, alkali activation, steam curing, microscopic composition, heavy metal leaching, action mechanism

中图分类号:

TU526

安赛, 王宝民, 陈文秀, 王晓军. 矿渣-电石渣基地质聚合物的性能及作用机制[J]. 硅酸盐通报, 2023, 42(11): 3996-4005.

AN Sai, WANG Baomin, CHEN Wenxiu, WANG Xiaojun. Performance and Action Mechanism of Slag-Carbide Slag Based Geopolymer[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(11): 3996-4005.

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