C-S-H凝胶产物在抑制ASR中的作用  

The Effect of C-S-H Gel on Alkali-silica Reaction

作　　者：魏风艳[1] 兰祥辉[1] 吕忆农[1] 许仲梓[1] 

机构地区：[1]南京工业大学材料科学与工程学院,210009

出　　处：《混凝土与水泥制品》2004年第3期5-8,共4页China Concrete and Cement Products

基　　金：国家重点基础研究项目"973"(2001CB610706)

摘　　要：用粉煤灰部分取代水泥制作砂浆试件 ,在模拟孔溶液碱度的碱液中养护 ,测定了不同龄期砂浆棒的膨胀率和Ca(OH)2含量的变化。试验用扫描电子显微镜 (SEM)观察C -S -H凝胶的形貌和用能谱分析 (EDAX)测定了C -S-H凝胶的化学组成。结果显示 ,粉煤灰的掺入对ASR有较好的抑制效果。粉煤灰主要是通过与Ca(OH)2 及水泥熟料水化生成的高Ca/Si比的C -S-H凝胶发生二次火山灰反应 ,生成大量低Ca/Si比的C -S-H凝胶 ,提高了对孔溶液中Na+ 和K+ 的吸收 。The expansion rate and the content of Ca(OH) 2 of mortar bars are experimentally measured at different age,in which the cement is partially replaced by lfy ash and the specimens are cured in simulated alkali solution.The morphology of C-S-H gel was observed by Scanning Electron Microscope(SEM)and the chemical composition of C-S-H gel was analyzed by energy-dispersive X-ray analysis(EDAX).The results showthat fly ash will reacte with Ca(OH) 2 and high Ca/Si ratio C-S-H gel produced by the hydration of clinker,and so that to produce the C-S-H gel with a lower molar ratio of CaO/SiO.And such C-S-H gel can bind more Na + and K + ions.

关 键 词：碱 CA/SI比 C-S-H凝胶 碱-硅酸反应 

分 类 号：TU528.01[建筑科学—建筑技术科学]