Early hydration of composite cement with thermal activated coal gangue
Early hydration of composite cement with thermal activated coal gangue
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DOI：
10.1007/s11595-010-1162-0
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发表时间：
2010-02-01
影响因子：
1.6
通讯作者：
Yang Nanru
中科院分区：
文献类型：
--
作者：
Guo Wei;Zhu Jianping;Yang Nanru
将煅烧后的煤矸石与熟料、石膏混合，制备了复合水泥试样。测试了水泥浆体的力学强度和Ca（OH）2含量，并通过热重-差热分析（TG-DSC）、X射线衍射（XRD）、扫描电镜（SEM）和孔结构分析等手段对水泥浆体的组成和微观结构进行了分析。结果表明，热活化煤矸石能明显促进水泥熟料的早期水化，从而促进煤矸石自身的水化。水泥早期水化产物为C-S-H凝胶、Ca（OH）2和AFt。掺30%（质量分数）煤矸石的水泥具有较高的机械强度，其中700 A ℃煅烧煤矸石的水泥水化率最高，机械强度最高，凝胶孔最多，总孔隙率最低。
Composite cement samples were prepared by mixing clinker, gypsum with burnt coal gangues which was calcined at various temperatures. The mechanical strength and Ca(OH)(2) content in the cement paste were tested, and the paste composition and microstructure were analyzed by thermogravimetry-differential thermal analysis (TG-DSC), X-ray diffraction(XRD), scanning electronic microscopy (SEM) and pore structure analysis. Results demonstrate that the thermal activated coal gangue could accelerate the early hydration of cement clinker obviously, which promotes the gangue hydration itself. The early hydrated products of the cement are C-S-H gel, Ca(OH)(2) and AFt. The cement with 30% (in mass) the gangue exhibits higher mechanical strength, and among all the cement samples the one with the gangue burnt at 700 A degrees C displays the highest hydration rate, mechanical strength, the most gel pores and the lowest total porosity.