金尾矿蒸压加气混凝土水化机理和微观结构分析  

The hydration mechanism and microstructural investigations on autoclaved aerated concrete with gold tailings

作　　者：陈伟[1] 倪文[1] 李德忠[1] 祝丽萍[1] 李倩[1] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083

出　　处：《材料科学与工艺》2015年第1期32-37,共6页Materials Science and Technology

基　　金：国家高技术研究发展计划(863计划)资助项目(2012AA062405)

摘　　要：为明确金尾矿蒸压加气混凝土制品的水化机理和微观结构的内在关系,通过对比硬化坯体(NAC)、蒸压恒温养护0 h(AAC-0)和蒸压恒温养护8 h(AAC-8)的3组样品的XRD谱、IR谱图分析其水化产物种类的变化,并对比SEM照片分析了其微观结构变化.研究结果表明,随着蒸压养护过程的进行,坯体内的水化产物出现阶段性变化,最终由富钙型水化硅酸钙向托贝莫来石转化,由于托贝莫来石生成的局限性和同步性,导致微观孔壁结构出现明显的分层现象,后生成的托贝莫来石层使孔结构成为中空的刚性球,作为"骨料",起到骨架和支撑的作用.To research the relationship between hydration mechanism and microstructure of autoclaved aerated?gold tailings concrete products, three samples, the hardening body(NAC), the product only by heating and cooling in the autoclaved kettle( AAC-0) and the product of autoclave constant temperature curing eight hour (AAC-8), were made. The XRD, IR and SEM patterns of those samples were compared by analyzing the changes of hydration products and microstructure. The results showed that as the process of steam curing went by, hydration products inside the body would transform from calcium?rich calcium silicate hydrates to tobermorites. Because the limitations and synchronization of the generation of tobermorites would lead to apparent stratification in the pore structures, the layer composed by tobermorites made the structure of pore into hollow rigid spheres and played a role in being skeletons and proping as “aggregate”.

关 键 词：金尾矿 加气混凝土 微观结构 托贝莫来石 孔壁结构 

分 类 号：TU528[建筑科学—建筑技术科学]