Bobirică Constantin, Orbeci Cristina, Bobirică Liliana, Palade Petru, Deleanu Călin, Pantilimon Cristian Mircea, Pîrvu Cristian, Radu Ionuţ Cristian
Department of Analytical Chemistry and Environmental Engineering, University Politehnica of Bucharest, 1-7 Polizu, 011061, Bucharest, Romania.
National Institute of Materials Physics, P.O. Box MG-7, 077125, Bucharest-Magurele, Romania.
Sci Rep. 2020 Nov 13;10(1):19827. doi: 10.1038/s41598-020-76818-4.
The influence of waste glass and red mud addition as alternative source of aluminosilicate precursors on the microstructural, mechanical, and leaching properties of bottom ash-based geopolymer was studied in this work through mineralogical, morphological, and spectroscopic analysis, as well as by conducting compressive strength and leaching tests. The bottom ash-based geopolymer composites were synthesized by adding a constant amount of waste glass (10% by weight) and increasing amounts of red mud (up to 30% by weight). The results derived from FTIR, Si and Al MAS NMR, and SEM-EDX revealed that adding up to 10% (by weight) red mud to the synthesis mixes leads to an increase in the degree of geopolymerization of the activated mixes. The compressive strength followed the same trend. An increase of more than 10% (by weight) red mud added to the synthesis mixes results in a significant decrease of compressive strength of the geopolymer composites. A low leachability of geopolymer composites in regard with their contaminants was revealed especially for those with good compressive strength.
在本研究中，通过矿物学、形态学和光谱分析，以及进行抗压强度和浸出试验，研究了添加废玻璃和赤泥作为硅铝酸盐前驱体替代来源对底灰基地质聚合物微观结构、力学性能和浸出性能的影响。通过添加恒定数量的废玻璃（重量比10%）和增加赤泥数量（最高重量比30%）来合成底灰基地质聚合物复合材料。傅里叶变换红外光谱（FTIR）、硅和铝的魔角旋转核磁共振（Si和Al MAS NMR）以及扫描电子显微镜-能谱分析（SEM-EDX）的结果表明，在合成混合物中添加高达10%（重量）的赤泥会导致活化混合物的地质聚合程度增加。抗压强度也呈现相同趋势。当合成混合物中添加超过10%（重量）的赤泥时，地质聚合物复合材料的抗压强度会显著降低。研究发现，地质聚合物复合材料对其所含污染物的浸出性较低，特别是那些具有良好抗压强度的复合材料。
