【摘要】：地聚合物具有獨特的空間三維網(wǎng)絡結構使其在固結重金屬離子方面具有優(yōu)勢,引起了人們的廣泛關注。傳統(tǒng)的地聚合物固化重金屬多采用無鈣或低鈣的硅鋁質材料,且研究主要集中在固化體的制備及力學性能方面,對于高鈣粉煤灰地聚合物的重金屬離子固結性能以及固化體的性能研究較少。本文以高鈣粉煤灰為基礎材料,硅灰為輔助材料制備地聚合物,分析各因素對地聚合物抗壓強度和抗凍性能的影響,獲得綜合性能最佳的基體配合比。并在此基礎上,制備地聚合物固化體,分析固化效果和重金屬Cu離子和Cr離子對固化體性能的影響。研究結果表明:當激發(fā)劑的SiO_2/Na_2O為1.2,Na_2O用量為8%,硅灰摻量為10%,且試件在80℃下預蒸養(yǎng)24h時,高鈣粉煤灰基地聚合物的綜合性能最佳;在激發(fā)劑的SiO_2/Na_2O較低時,Na_2O用量比較大的地聚合物試件具有較高的強度增長率;在激發(fā)劑的SiO_2/Na_2O較高時,Na_2O用量比較小的地聚合物試件具有較高的強度增長率;重金屬離子的加入減緩了高鈣粉煤灰基地聚合物的聚合反應程度;當重金屬離子(Cu~(2+)、Cr~(3+))摻量增加時,適當?shù)奶岣唧w系的水膠比有利于提高固化體的抗壓強度和離子穩(wěn)定性;鉻離子固化體孔隙含量相對更高,孔徑分布更加合理,受低溫的影響更小。
[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，

本文編號：2332248