摘要
采用热分析和XRD衍射分析方法,对偏高岭土中活性氧化铝进行了定性分析。结果表明,高温煅烧破坏了高岭土的晶型结构,使得高岭土中非活性的氧化铝转变为活性的氧化铝。为进一步测得偏高岭土中活性氧化铝的含量,采用铬天青-S分光光度法测试了偏高岭土中活性氧化铝的含量,并研究了活性氧化铝含量与偏高岭土胶凝性能的关系。结果表明:偏高岭土中活性氧化铝可通过酸浸溶出,采用铬天青-S分光光度法能准确地测试偏高岭土中活性氧化铝的含量;龙岩高岭土在600℃下煅烧6 h获得的偏高岭土活性最高,其活性氧化铝含量为24.9%,用其制备的地聚合物3 d抗压强度也最大,达到58.1 MPa;偏高岭土中活性氧化铝含量与用其制备的地聚合物的抗压强度有很好的对应关系。
Thermal analysis method and XRD pattern analysis method were used to analyze activated alumina in metakaolin qualitatively. Results indicated that calcination destroyed crystal structure of kaolin and non-active alumina transformed to activated alumina. Content of activated alumina in metalkaolin was measured quantitatively by chrome azurol-s Spectrophotometry method. Then the relationship of activated alumina content and its cementitious activity was studied. Results indicated that activated alumi na in metakaolin can be dissolved by acid leaching method,the activated alumina content can be accurately tested by using chrome azurol-s Spectrophotometry method; the activity of metakaolin obtained by calcining Longyan kaolin for 6 h at 600 ℃ is the highest, its activated alumina content is of 24.9%,the 3 d compressive strength of the geopolymer prepared with it reached a maximum of 58.1 MPathe activated alumina content in metakaolin showed good correlation with the compressive strength of the geopolymer.
出处
《新型建筑材料》
2014年第1期50-53,75,共5页
New Building Materials
