地质聚合物合成中铝酸盐组分的作用机制(英文)  

HYDROLYSIS KINETICS OF ALUMINATES IN GEOPOLYMERS SYNTHESIS

作　　者：翁履谦[1] SAGOE-CRENTSIL Kwesi 宋申华[1] 张化宇[1] 

机构地区：[1]哈尔滨工业大学深圳研究生院材料科学与工程系,广东深圳518055 [2]CMIT澳大利亚国家科学与工程研究院

出　　处：《硅酸盐学报》2005年第3期276-280,共5页Journal of The Chinese Ceramic Society

摘　　要：在对铝、硅酸盐离子团中离子的部分电荷计算的基础上,研究了铝组分在地质聚合物合成中的作用机制,并通过实验进行了初步验 证。研究表明:铝组分对地质聚合物的合成中缩聚反应有显著的促进作用,因而在合成地质聚合物时原料中铝组分的溶解性至关重要。实验 结果表明:由具有较小颗粒度的煅烧高岭土为原料合成的地质聚合物具有较短的固化时间,更均匀的显微结构和更高的机械强度。如由较粗 的煅烧高岭土为原料合成的地质聚合物的抗压强度为54MPa,而由较细的煅烧高岭土为原料合成的地质聚合物的抗压强度则能达到 74MPa。The mechanisms of Al speciation and hydrolysis in geopolymers were investigated based on the partial charge model together with preliminary experimental validation. The study essentially concludes that aluminate species generally promote the condensation reactions in aluminosilicate systems owing to such factors as their partial charge, atomic size and the number of hydroxyl groups. Consequently, the solubility of aluminate sources, like metakaolin, has important influence on the properties of geopolymers. Experimental results further show that the duration of milling metakaolin, which results in different particle sizes and different dissolution rates of metakaolin, has an important effect on geopolymer properties such as setting time, microstructure and compressive strength. The samples from the larger specific surface area of metakaolin give quicker setting time, higher compressive strength, and a more homogeneous microstructure. The compressive strength is 54 MPa for the samples produced from coarse metakaolin, up to 74 MPa for those from fine metakaolin.

关 键 词：地质聚合物 合成机理 部分电荷分布 

分 类 号：TQ172[化学工程—水泥工业]