水热碱性环境下粉煤灰水化进程研究  

Study of Fly Ash Hydrated Course in Hydrothermal and Alkaline Environment

作　　者：罗忠涛[1] 马保国[1] 李相国[1] 王迎斌[1] 孙涛[1] 

机构地区：[1]武汉理工大学硅酸盐材料工程教育部重点实验室,湖北武汉430070

出　　处：《中国矿业大学学报》2010年第2期275-278,共4页Journal of China University of Mining & Technology

基　　金：国家重点基础研究发展计划(973)项目(2009CB623201);"十一五"国家科技支撑计划项目(2006BAF02A24)

摘　　要：通过Ka法(ICP-AES)快速评价分析,结合SEM-EDS微观形貌观察,研究了粉煤灰在80±2℃水热碱性环境下的水化特征及水化历程.结果表明:粉煤灰化学活性反应实际上是一个累加变化过程,Ka值在3d龄期之后出现快速增长趋势,其14d龄期的Ka值达到77.41%.水热碱性环境下粉煤灰颗粒在反应初期与Ca(OH)2反应形成CSH单层膜或CH-CSH双层膜附着于颗粒表面,反应膜层的形成延缓了Ka值初期的增长速度.易反应区域会形成溶蚀活化点促进反应介质的继续反应,溶蚀活化点在反应后期进一步扩展,粉煤灰玻璃体中的大部分活性SiO2,Al2O3参与反应,剩下由惰性莫来石及/或新生矿物沸石形成的镂空状搭接结构.The hydration character and process of fly ash in alkaline water at 80±2 ℃ were researched by Ka method（ICP-AES） rapid evaluation and SEM-EDS analysis. The results indicate that the chemical activity reaction of fly ash is actually an accumulative process. Ka value increased quickly after 3 days, and reached 77.41% at 14 days. Fly ash granule reacted with Ca（OH）2 and generated CSH monolayer film or CSH double deck film at the initial stage which adhered to the granule surface. The formation of reactant reduced the increasing speed of Ka value at the initial stage. The area where is easy to react formed activation point to promote reaction medium to react continually. The activation point was enlarged more at the later period, and most of active SiO2, Al2O3 in fly ash reacted completely. The inert mullite and newborn mineral-zeolite which doesn＇t react in this process formed joining structure with hollow shape.

关 键 词：粉煤灰 水化环境 水化进程 

分 类 号：TU528.01[建筑科学—建筑技术科学]