高钙灰地聚合物的离子固化作用及固化体的性能研究
发布时间：2018-11-14 20:41
【摘要】：地聚合物具有独特的空间三维网络结构使其在固结重金属离子方面具有优势,引起了人们的广泛关注。传统的地聚合物固化重金属多采用无钙或低钙的硅铝质材料,且研究主要集中在固化体的制备及力学性能方面,对于高钙粉煤灰地聚合物的重金属离子固结性能以及固化体的性能研究较少。本文以高钙粉煤灰为基础材料,硅灰为辅助材料制备地聚合物,分析各因素对地聚合物抗压强度和抗冻性能的影响,获得综合性能最佳的基体配合比。并在此基础上,制备地聚合物固化体,分析固化效果和重金属Cu离子和Cr离子对固化体性能的影响。研究结果表明:当激发剂的SiO_2/Na_2O为1.2,Na_2O用量为8%,硅灰掺量为10%,且试件在80℃下预蒸养24h时,高钙粉煤灰基地聚合物的综合性能最佳;在激发剂的SiO_2/Na_2O较低时,Na_2O用量比较大的地聚合物试件具有较高的强度增长率;在激发剂的SiO_2/Na_2O较高时,Na_2O用量比较小的地聚合物试件具有较高的强度增长率;重金属离子的加入减缓了高钙粉煤灰基地聚合物的聚合反应程度;当重金属离子(Cu~(2+)、Cr~(3+))掺量增加时,适当的提高体系的水胶比有利于提高固化体的抗压强度和离子稳定性;铬离子固化体孔隙含量相对更高,孔径分布更加合理,受低温的影响更小。
[Abstract]:Geopolymers have been widely concerned because of their unique three-dimensional spatial network structure and their advantages in the consolidation of heavy metal ions. The traditional geopolymer solidified heavy metals mostly used silica-aluminum materials without calcium or low calcium, and the research mainly focused on the preparation and mechanical properties of solidified materials. There are few studies on heavy metal ion consolidation and solidification properties of high calcium fly ash geopolymers. In this paper, based on high calcium fly ash and silica fume as auxiliary material, the influence of various factors on the compressive strength and freezing resistance of the ground polymer is analyzed, and the optimum matrix mixture ratio of the comprehensive properties is obtained. On this basis, the solidified polymer was prepared and the effects of heavy metal Cu and Cr ions on the properties of the solidified polymer were analyzed. The results show that when the amount of SiO_2/Na_2O of activator is 1.2n Na2O is 8, the amount of silica fume is 10, and the sample is presteamed at 80 鈩，
本文编号：2332248
[Abstract]:Geopolymers have been widely concerned because of their unique three-dimensional spatial network structure and their advantages in the consolidation of heavy metal ions. The traditional geopolymer solidified heavy metals mostly used silica-aluminum materials without calcium or low calcium, and the research mainly focused on the preparation and mechanical properties of solidified materials. There are few studies on heavy metal ion consolidation and solidification properties of high calcium fly ash geopolymers. In this paper, based on high calcium fly ash and silica fume as auxiliary material, the influence of various factors on the compressive strength and freezing resistance of the ground polymer is analyzed, and the optimum matrix mixture ratio of the comprehensive properties is obtained. On this basis, the solidified polymer was prepared and the effects of heavy metal Cu and Cr ions on the properties of the solidified polymer were analyzed. The results show that when the amount of SiO_2/Na_2O of activator is 1.2n Na2O is 8, the amount of silica fume is 10, and the sample is presteamed at 80 鈩，
本文编号：2332248
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