高温蒸养对粉煤灰水泥基材料水化产物结构的影响  

Effect of high temperature autoclaving curing on microstructure of hydration product for fly ash cement-based material

作　　者：徐子芳[1] 张明旭[1] 朱金波[1] 

机构地区：[1]安徽理工大学材料科学与工程学院,安徽淮南232001

出　　处：《材料热处理学报》2011年第8期28-31,共4页Transactions of Materials and Heat Treatment

基　　金：国家自然基金项目(10872001);安徽理工大学博士基金项目(2010yc001)

摘　　要：运用基本力学及导热系数测定实验系统对高温蒸养作用后的粉煤灰水泥基材料的抗压强度和热导率进行了试验研究,并借助于X射线衍射(XRD)、扫描电镜(SEM)和热重-差热分析(TG-DTA)等手段对水化产物的微观结构对其宏观性能的决定性机理进行了分析。结果表明:随蒸养温度的增加,粉煤灰水泥基材料的强度和保温性能均增强。钙矾石(AFt)转变为单硫型水化硫铝酸钙(AFm),粉煤灰释放珠状的铝、硅成分形成莫来石,水化产物失水后重新结合,晶相、晶形稳定性增强是蒸养后强度及保温性能增强的主要原因。Compressive strength and thermal conductivity of fly ash cement-based composite material after high temperature autoclaving curing were investigated with fundamental mechanical experiment and thermal conductivity testing system.The mechanism involved in the increasing of performance of the material was disscussed based on microstructure study of the hydration product by means of X-ray diffraction（XRD）,scanning electron microscopy（SEM） and thermogravimetry/differential thermal analysis（TG/DTA）.The results show that the strength and heat insulation performance of fly ash cement-based material both increased with the increase of autoclaving curing temperature.The enhancement of strength and heat insulation performance after autoclaving curing are ascribed to the transformation of ettringite to calcium salphoaluminate,fly ash after release of pearl shape aluminium and silicon to form mullite,as well as the reconnection of the hydration products lost water and the increase of the stability of crystal phase and crystal morphology of the hydration products.

关 键 词：蒸养 粉煤灰水泥基材料 水化产物 微观结构 

分 类 号：TU52[建筑科学—建筑技术科学]