煤矸石细集料对水泥浆体微观结构的影响及其作用机理

发布时间：2018-01-29 14:57

本文关键词： 煤矸石细集料微观结构活性　出处：《建筑材料学报》2014年04期 　论文类型：期刊论文

【摘要】：以自燃煤矸石细集料-水泥浆体和非自燃煤矸石细集料-水泥浆体为研究对象,采用X射线衍射仪和扫描电镜研究自燃和非自燃煤矸石细集料对水泥浆体水化产物的物相组成、微观形貌的影响,分析煤矸石细集料活性对水泥浆体微观结构和强度发展的作用机理.结果表明:自燃煤矸石细集料早龄期发生明显的活性反应,在水泥浆体中形成水钙沸石、水石榴石、钙铁榴石等新物相,对水泥浆体早期抗压强度有一定提高作用;非自燃煤矸石细集料对水泥浆体水化进程和微观结构没有产生影响.2种煤矸石细集料均存在一个最优掺量.当煤矸石掺量(质量分数)为20%时,自燃煤矸石细集料-水泥浆体和非自燃煤矸石细集料-水泥浆体抗压强度均最高.
[Abstract]:The self-ignition coal gangue fine aggregate cement paste and the non-spontaneous combustion coal gangue fine aggregate cement paste were taken as the research objects. The effects of self-ignition and non-spontaneous combustion gangue fine aggregates on the phase composition and microstructure of cement paste hydration products were studied by X-ray diffraction and scanning electron microscopy. The mechanism of action of coal gangue fine aggregate activity on the microstructure and strength development of cement paste is analyzed. The results show that the spontaneous combustion coal gangue fine aggregate has obvious active reaction in early age and forms calcium hydrite in cement paste. The new phases, such as garnet and calcium iron garnet, can improve the early compressive strength of cement paste. Non-spontaneous combustion coal gangue fine aggregate has no effect on the hydration process and microstructure of cement paste. 2 kinds of coal gangue fine aggregate have an optimal content, when the coal gangue content (mass fraction) is 20. The compressive strength of autoignition coal gangue fine aggregate-cement paste and non-spontaneous combustion coal gangue fine aggregate-cement paste is the highest.
【作者单位】：中国矿业大学江苏省土木工程环境灾变与结构可靠性重点实验室;中国矿业大学力学与建筑工程学院;
【基金】：国家自然科学基金资助项目(51274192) 江苏省土木工程环境灾变与结构可靠性重点实验室开放研究基金资助项目(JSKL2012YB08) 江苏高校优势学科建设工程项目(PAPD)
【分类号】：TU528
【正文快照】： 煤矸石(CG)化学成分中富含氧化硅和氧化铝,与混凝土常用砂、石集料无论在“质”还是在“量”上均具有双重近似性[1].将煤矸石作为混凝土粗、细集料[2-4]是其资源化再利用的又一有效途径.自燃后的煤矸石具有火山灰活性,可用作水泥混凝土辅助胶凝材料.目前研究用作辅助胶凝材料

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