煅烧黏土反应活性及其影响机理
作者:
作者单位:

1.武汉理工大学 硅酸盐建筑材料国家重点实验室,湖北 武汉 430070;2.武汉理工大学 材料科学与工程国际化示范学院,湖北 武汉 430070;3.NED工程技术大学 机械工程系, 信德 卡拉奇 74200;4.尼泊尔国家科学技术院 巴格马蒂 拉利特普尔 44700

作者简介:

胡传林(1985—),男,河南商丘人,武汉理工大学研究员,博士生导师,博士. E-mail: chuanlin@whut.edu.cn

通讯作者:

王发洲(1975—),男,湖北襄阳人,武汉理工大学教授,博士生导师,博士. E-mail: fzhwang@whut.edu.cn

中图分类号:

U414.1

基金项目:

“十三五”国家重点研发计划-政府间国际科技创新合作重点专项(2018YFE0106300);武汉市科技计划项目(2020020601012279)


Reactivity of Calcined Clay and Its Influence Mechanism
Author:
Affiliation:

1.State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China;2.International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China;3.Department of Mechanical Engineering, NED University of Engineering and Technology, Karachi 74200,Pakistan;4.Nepal Academy of Science and Technology, Lalitpur 44700, Nepal

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    摘要:

    采用煅烧黏土在碱性溶液中的反应热试验,探明了氢氧化钙含量、反应温度、煅烧温度和高岭石含量等因素对煅烧黏土反应活性的影响规律及其机理.结果表明:反应热试验能够实现煅烧黏土反应活性的快速表征,且累计放热量与黏土中高岭石含量具有良好的线性相关性;随着煅烧温度的升高,黏土颗粒逐渐破碎,结构无序化程度增大,反应活性出现并逐渐增长到峰值,随后黏土颗粒粒径进一步增大,导致反应活性显著下降.

    Abstract:

    Through the reaction heat release of calcined clay in alkaline solution, the influence rule and mechanism concerning calcium hydroxide content,reaction temperature, calcination temperature and kaolinite content on the reactivity of calcined clay were investigated. Results show that the reactivity of calcined clay can be easily characterized by the reaction heat release analysis, and there is a good linear correlation between the cumulative heat release and the kaolinite content of the clay. With the increase of calcination temperature, the clay particles are broken, the degree of structural disorder increases, and the reaction begins and gradually accelerates to its peak,then the clay particle size further increases and the reactivity decreases significantly.

    图1 黏土的TG-DTG曲线Fig.1 TG-DTG curve of clay
    图2 6种混合样品的累积放热曲线及反应200 h后的XRD图谱Fig.2 Cumulative heat release curves and XRD patterns after 200 h of reaction of six kinds of mixed sample
    图3 样品(m(Ca(OH)2)∶m(calcined clay)= 2∶1)在 20、40 ℃条件下的累计放热曲线对比Fig.3 Comparison of cumulative heat release curve of sample(m(Ca(OH)2)∶m(calcined clay)= 2∶1)at 20,40 ℃
    图4 不同温度煅烧的黏土 S6在40 ℃下的热流曲线和累计放热曲线Fig.4 Heat flow and cumulative heat release curves at 40 ℃ of clay S6 at different calcination temperatures
    图5 黏土S6在不同煅烧温度下的XRD图谱Fig.5 XRD patterns of clay S6 at different calcination temperatures
    图6 黏土S6在不同煅烧温度下的SEM照片Fig.6 SEM images of clay S6 at different calcination temperatures
    图7 黏土S6在不同煅烧温度下的粒径分布Fig.7 Particle size distributions of clay S6 at different calcination temperatures
    图8 黏土S6在不同煅烧温度下的27Al NMR图谱Fig.8 27Al NMR spectra of clay S6 at different calcination temperatures
    图9 6种黏土在不同煅烧温度下的累计放热量对比Fig.9 Comparison of 24 h cumulative heat releases of six kinds of clay at different calcination temperatures
    图10 煅烧黏土的24 h 累计放热量与高岭石含量的相关性Fig.10 Correlation between cumulative heat release at 24 h and kaolinite content of calcined clay
    表 1 高岭石含量不同的6种黏土的化学组成Table 1 Chemical compositions of six kinds of clay with different kaolinite contents
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引用本文

胡传林,陶永征,TARIQ Jamil, BISHNU Gautam,王发洲.煅烧黏土反应活性及其影响机理[J].建筑材料学报,2023,26(2):179-185

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  • 收稿日期:2021-12-30
  • 最后修改日期:2022-02-14
  • 在线发布日期: 2023-03-06
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