摘要: |
本研究探讨了铝酸钙水泥掺量对粉煤灰基地聚合物性能的影响规律。用铝酸钙水泥代替粉煤灰,掺量分别为0%、2%、4% 、8%和12%。运用SEM、XRD、FTIR与TG等测试方法,对复掺铝酸钙水泥的地聚合物浆体进行微观机理探究;开展流动度试验、凝结时间与抗压强度试验,对复掺铝酸钙水泥的地聚合物浆体进行宏观性能分析。结果表明,复掺CAC有利于生成更多的富铝凝胶和C-S-H凝胶,且C-S-H凝胶具有更大的生成速率。由于铝酸钙水泥具有不规则棱角状颗粒形态,复掺铝酸钙水泥减弱地聚合物浆体流动度;更快生成的C-S-H凝胶和富铝凝胶显著缩短了浆体凝结时间,生成更多的富铝凝胶和C-S-H凝胶,使得地聚合物浆体内部结构更加密实,促进抗压强度增长。因此,复掺铝酸钙水泥有利于提高地聚合物浆体性能。 |
关键词: 粉煤灰地聚合物 铝酸钙水泥 微观机理 抗压强度 |
DOI: |
分类号: |
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目) |
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Properties of fly ash geopolymer with calcium aluminate cement as an additive |
WangYamin,HuShaowei,Fan Xiangqian,LouBenxing,YaoLiqin,HuDengxing
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1.Department of Materials and Structural Engineering, Nanjing Hydraulic Research Institute;2.School of Civil Engineering, Chongqing University;3.Qinglong Pipes
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Abstract: |
The main purpose of this study is to explore the effect of calcium aluminate cement (CAC) on the properties of fly ash geopolymer (FAG). CAC was used as a substitute for fly ash, with replacement amount of 0%, 2%, 4%, 8% and 12%. In order to explore the micro-mechanism and macro-performance of geopolymer mixed with CAC, the SEM, XRD, FTIR and TG test methods were used and fluidity test, setting time test and compressive strength test were carried out. The results show that increasing CAC content is beneficial for generating more aluminium-rich gels and C-S-H gels, and the growth rate of C-S-H gel is higher. For the geopolymer mixed with CAC, the fluidity was weakened owing to the irregular particle shape, the setting time was shortened because of the faster generation of C-S-H gel and aluminum rich gel, and the compressive strength was deeply improved thanks to the greater amounts of aluminium-rich and C-S-H gels. Therefore, CAC can improve the performance of geopolymer paste. |
Key words: fly ash geopolymer calcium aluminate cement micro-mechanism compressive strength |