冷却条件对低热水泥熟料中方镁石晶体的影响
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摘要
设计MgO质量分数为5%的低热熟料配比,在1 400℃下保温2 h后在不同的冷却条件下制备样品,利用化学分析、X线衍射仪(XRD)、扫描电子显微镜(SEM)等测试方法,研究冷却条件对熟料中方镁石晶体的影响。结果表明:提高冷却速率能降低熟料中方镁石的含量,同时也减小方镁石的晶粒尺寸。方镁石主要分布在硅酸盐相边缘或者中间相中间,且该区域内的方镁石的尺寸要大于硅酸盐相内部的方镁石的晶粒尺寸。方镁石的形貌受冷却速率的影响较小,多为板状或者不规则的多边形。
The low heat Portland cement clinkers with 5% MgO were prepared by sintering at 1 400 ℃ for 2 h and at different cooling conditions. Effects of cooling condition on the formation of periclase in clinkers were studied through chemical analysis, X-ray diffraction(XRD), scanning electron microscope(SEM). Results showed that with the increase of the cooling rate, both the content and the crystal size of periclase in clinkers decreased. Most of the periclase crystals formed at the edge of silicate phase and in the intermediate phase, and the crystal size of these periclase was larger than those formed within silicate phases. The morphology of periclase in low heat Portland cement was tabular or irregular, and was not significantly influenced by the change of cooling condition.
The low heat Portland cement clinkers with 5% MgO were prepared by sintering at 1 400 ℃ for 2 h and at different cooling conditions. Effects of cooling condition on the formation of periclase in clinkers were studied through chemical analysis, X-ray diffraction(XRD), scanning electron microscope(SEM). Results showed that with the increase of the cooling rate, both the content and the crystal size of periclase in clinkers decreased. Most of the periclase crystals formed at the edge of silicate phase and in the intermediate phase, and the crystal size of these periclase was larger than those formed within silicate phases. The morphology of periclase in low heat Portland cement was tabular or irregular, and was not significantly influenced by the change of cooling condition.
引文
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[2]ACI COMMITTEE.Mass concrete for dams and other massive structures[J].ACI Sturctrual Journal,1970,67(4):273.
[3]CHATTERJEE A K.High belite cements present status and future technological options:part I[J].Cement and Concrete Research,1996,26(8):1213.
[4]隋同波,范磊,文寨军,等.低能耗、低排放、高性能、低热硅酸盐水泥及混凝土的应用[J].中国材料进展,2009,28(11):46.
[5]马忠诚,姚燕,王显斌,等.高镁中热硅酸盐水泥的制备及性能研究[J].武汉理工大学学报,2014,36(9):1.
[6]王燕,许晓英,蔡攀.中热硅酸盐水泥生产工艺配方研究[J].水泥,2015(3):5.
[7]隋同波,文寨军.低能源资源消耗、低环境负荷和高性能水泥:高贝利特水泥[J].中国建材,2003,1(9):60.
[8]黎茜,阳运霞,陈雪梅,等.低热硅酸盐水泥的研究进展[J].居业,2015,7(22):15.
[9]隋同波,文寨军,张忠伦,等.低热硅酸盐水泥性能评价[J].水泥工程,2003(6):13.
[10]陈连发,王振雷,陆洋,等.低热微膨胀水泥的研制[J].吉林化工学院学报,2015,32(1):60.
[11]ZAPATA A,PEDRO B.Low temperature preparation of belitic cement clinker[J].Journal of the European Ceramic Society,2009,29(10):1879.
[12]隋同波,文寨军.低能源资源消耗、低环境负荷和高性能水泥:高贝利特水泥[J].中国建材,2003,52(9):60.
[13]王显斌,文寨军.低热硅酸盐水泥及其在大型水电工程中的应用[J].水泥,2014(11):22.
[14]贾金生,袁玉兰,郑璀莹,等.中国水库大坝统计和技术进展及关注的问题简论[J].水力发电,2010,36(1):6.
[15]袁美栖,唐明述.吉林白山大坝混凝土自生体积变形膨胀机理的研究[J].南京工业大学学报(自然科学版),1984,6(2):38.
[16]李红,邓敏,莫立武,等.不同活性氧化镁膨胀剂对水泥浆体变形的影响[J].南京工业大学学报(自然科学版),2010,32(6):98.
[17]MO L,DENG M,TANG M,et al.Mg O expansive cement and concrete in China:past,present and future[J].Cement and Concrete Research,2014,57(1):1.
[18]VANDEPERRE L J,LISKA M,AL-TABBAA A.Microstructures of reactive magnesia cement blends[J].Cement and Concrete Composites,2008,30(8):706.
[19]嵇鹰,李霞,陈冠君.高镁石灰石煅烧制度对熟料性能及熟料中方镁石形成的影响[J].硅酸盐通报,2015,43(2):450.
[20]朱颖灿.水泥熟料中方镁石的水化和膨胀[D].南京:南京工业大学,2009.
[21]虞冕,陈胡星,傅肯旋,等.熟料氧化镁含量与冷却条件对氧化镁形态的影响[J].材料科学与工程学报,2013,31(3):399.
[22]赵松海,魏丽颖,刘松辉,等.高温液相对熟料方镁石形成的影响[J].硅酸盐通报,2014,42(7):1599.
[23]魏丽颖,赵松海,刘松辉,等.制备条件对熟料中Mg O形态分布的影响[J].武汉理工大学学报,2013,35(10):27.