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研究粉煤灰在碱性激发剂作用下硅、铝、钙的溶出聚合机理,并研究了生成的粉煤灰地聚合物的抗压强度、微观结构和形貌特征.研究表明:在地聚合反应中,粉煤灰玻璃质球体溶蚀,硅铝相不断溶出且逐渐增加,继而再聚合生成地聚合物凝胶,钙质成分部分键合在地聚合物中以平衡电价,部分参与水化反应生成相应的水化产物;粉煤灰地聚合物在75℃养护8... 相似文献
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系统介绍了周内外关于矿聚物的组织结构、性能及影响因素、制备工艺及特点、矿聚物的反应过程与聚合机理。评述了矿聚物的陶瓷化、先进矿聚物基复合材料、矿聚物及其复合材料的应用等方面的研究进展,指出了今后矿聚物及其复合材料的研究方向。 相似文献
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土壤聚合反应的影响因素 总被引:6,自引:1,他引:6
讨论了原料配方,激活剂种类,碱性激活剂掺量及含水量等对土壤聚合反应的影响,另外,对不同养护温度下土壤聚合反应的最佳养护时间也进行了研究。 相似文献
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Afonso R. G. de Azevedo Markssuel Teixeira Marvila Higor Azevêdo Rocha Lucas Reis Cruz Carlos Mauricio Fontes Vieira 《International Journal of Applied Ceramic Technology》2020,17(6):2649-2658
The production process of ceramic roof tiles requires a large consumption of natural raw material, such as clay, and energy consumption in the sintering process. Thus, the objective of this research was the development of more ecological tile for civil construction, adopting the process of geopolymerization, which does not require burning, and the use of glass polishing waste, in partial replacement of natural raw material. Prismatic specimens were made with a ratio of alkaline solution/ (metakaolin + waste) = 0.26 and variation of the curing time in 7, 28, and 60 days, and a ratio of precursors with SiO2/Al2O3 varying in 2.5, 3.0, 3.5, and 4.0 for the evaluation of technological properties such as apparent specific mass, linear shrinkage, water absorption, and mechanical resistance to flexion, in addition to microstructural evaluations and the physical, chemical, and mineralogical characterization of the waste. The results showed that the glass waste had potential for use as a precursor in the geopolymerization process, and that the specimens with a 7 days cure and a SiO2/Al2O3 = 4 ratio are the most recommended for the production of roof tiles for civil construction. 相似文献
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在室温条件下,通过偏高岭石与磷酸水溶液中低聚[PO4]n^3n-四面体基团的缩合,制备了脱水铝硅酸盐-磷酸基矿物键合材料,该反应产物具有二维Si-O-Al-O-P结构。采用X射线衍射分析(x-ray diffraction,XRD)、Fourier红外吸收光谱、29^Si和27^Al魔角旋转核磁共振(nudear magnetic resonance,NMR)对反应产物进行了结构和反应机理分析。结果表明:反应产物中的Al^3+具有3种化学环境特征。29^Si NMR的化学位移只在-110处出现,预示着[SiO4]四面体以层状结构方式存在。反应产物的红外光谱中偏高岭石的表征Al-O层结构特征的800Cm^-1共振吸收峰消失。反应产物的XRD谱具有非晶结构特征。据此,对键合反应机理模型进行了推测。 相似文献