偏高岭土活性的煅烧温度影响及测定方法研究  

Research on Influence of Calcination Temperature on Metakaolin Reactivity and Its Determination

作　　者：彭晖[1,2] 崔潮 蔡春声[3] 李树霖[1] 张雄飞[4] 

机构地区：[1]长沙理工大学土木与建筑学院,长沙410114 [2]长沙理工大学桥梁工程安全控制教育部重点实验室,长沙410114 [3]路易斯安那州立大学建筑与环境工程系,路易斯安那70803 [4]长沙理工大学化学与生物工程学院,长沙410114

出　　处：《硅酸盐通报》2014年第8期2078-2084,2094,共8页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(51008036);湖南省科技计划项目(2012SK3101);湖南省研究生科研创新项目(CX2014B377);湖南省教育厅科学研究重点项目(14A005)

摘　　要：偏高岭土基地质聚合物在土木工程领域具有广泛的应用前景,其中偏高岭土的活性对生成的地质聚合物性能具有重要影响。评定偏高岭土活性的最直接方法是比较生成的偏高岭土基地质聚合物的抗压强度,但该方法周期较长,不利于实用。本文通过对高温煅烧后偏高岭土的DSC-TG分析、XRD分析和NMR分析,讨论了偏高岭土活性与其中活性氧化铝含量的相关性,探索了偏高岭土的高温活化机理和活性测定原理,提出了改进的滴定络合法和紫外分光光度计法并应用于偏高岭土活性测定,进而通过偏高岭土地聚物的力学性能试验予以验证。试验结果表明,煅烧温度对偏高岭土的活性有显著影响,随煅烧温度升高呈现先提高后降低的规律;滴定络合法和紫外分光光度计法可以测定铝的溶出率并且用于偏高岭土活性的快速测定。There is extensive prospect for the application of the metakaolin based geopolymer in the civil engineering. The mechanical performance of the metakaolin based geopolymer is tremendously influenced by the metakaolin reactivity, which can be determined by comparing the compressive strength of the goepolymer. However, the determination method for the metakaolin reactivity through the strength test of the metakaolin based geopolymer is time-consuming and inconvenient. In the present paper, the methods of DSC-TG, XRD, NMR were used to analyze the influence of the calcination temperature on the composition of the metakaolin. The relationship between the metakaolin reactivity and the activated alumina, and the mechanism that the calcination influences the metakaolin reactivity were discussed respectively. Furthermore, two test methods for the metakaolin reactivity, the improved complexometric titration and the UV-VIS spectrophotometer, were presented. The strength tests were conducted to investigate the relationship between the calcination temperature and the strength of the metakaolin basedgeopolymer. The test results show that the compressive strength of metakaolin based geopolymer increase at first and decrease later with the increase of the calcination temperature; and the improved complexometric titration and the UV-VIS spectrophotometer can be used to detect the percentage of dissolved A12 O3 and then determine the metakaolin reactivity.

关 键 词：偏高岭土活性 煅烧温度 滴定络合法 紫外分光光度计法 铝溶出率 

分 类 号：TD98[矿业工程—选矿]