磷建筑石膏对硫铝酸盐水泥熟料收缩特性的影响
作者:
作者单位:

1.武汉科技大学 城市建设学院,湖北 武汉 430065;2.中国一冶集团有限公司,湖北 武汉 430080;3.武汉科技大学 高性能工程结构研究院,湖北 武汉 430065

作者简介:

黄浩然(1996—),女,河南罗山人,武汉科技大学硕士生. E-mail: 2819476170@qq.com

通讯作者:

廖宜顺(1984—),男,湖北江陵人,武汉科技大学副教授,硕士生导师,博士. E-mail: liaoyishun@wust.edu.cn

中图分类号:

TQ172

基金项目:

长江科学院开放研究基金资助项目(CKWV2019756/ KY);国家自然科学基金资助项目(51608402)


Effect of Phosphorous Calcined Gypsum on Shrinkage Characteristics of Calcium Sulfoaluminate Cement Clinker
Author:
Affiliation:

1.School of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065, China;2.China First Metallurgical Group Company Limited, Wuhan 430080, China;3.Institute of High Performance Engineering Structure, Wuhan University of Science and Technology, Wuhan 430065, China

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    摘要:

    研究了不同掺量磷建筑石膏对硫铝酸盐水泥熟料凝结时间、化学收缩、自收缩、浆体内部相对湿度和干燥收缩的影响.结果表明:随着磷建筑石膏掺量的增加,熟料浆体的凝结时间显著缩短,化学收缩变化速率加快,浆体内部相对湿度逐渐降低,浆体自收缩与内部相对湿度具有较好的相关性;当磷建筑石膏掺量不超过25%时,硫铝酸盐水泥浆体化学收缩到达稳定阶段的时间缩短;当磷建筑石膏掺量为25%~30%时,硫铝酸盐水泥浆体在自收缩测试条件下产生膨胀,且干燥收缩小于空白组.

    Abstract:

    The setting time, chemical shrinkage, autogenous shrinkage, internal relative humidity and drying shrinkage of calcium sulfoaluminate (CSA) cement clinker blended with different amounts of phosphorous calcined gypsum (PCG) were investigated. The results show that the setting time of paste is shortened significantly with the increase of PCG content, and the rate of chemical shrinkage and the internal relative humidity of the paste is decreased gradually. The autogenous shrinkage has a good relationship with the internal relative humidity of the paste. The stable stage of chemical shrinkage is accelerated when the content of PCG is not more than 25%. When the content of PCG is 25% to 30%, the CSA cement paste expanded during the autogenous shrinkage test and the drying shrinkage of CSA cement clinker pastes are less than the control sample.

    表 1 原材料的化学组成Table 1 Chemical compositions of raw materials
    图1 原材料的XRD图谱Fig.1 XRD patterns of raw materials
    图2 PCG掺量对CSA水泥浆体凝结时间的影响Fig.2 Influence of PCG content on setting time of CSA cement paste
    图3 PCG 掺量对CSA水泥浆体化学收缩及其变化速率的影响Fig.3 Influence of PCG content on chemical shrinkage and change rate of CSA cement paste
    图4 PCG掺量对CSA水泥浆体内部相对湿度的影响Fig.4 Influence of PCG content on internal relative humidity of CSA cement paste
    图5 PCG 掺量对CSA水泥浆体自收缩曲线及其变化速率的影响Fig.5 Influence of PCG content on autogenous shrinkage and change rate of CSA cement paste
    图6 CSA水泥浆体自收缩与浆体内部相对湿度的关系Fig.6 Relationship between autogenous shrinkage and internal relative humidity of CSA cement paste
    图7 PCG15试件线性化学收缩与自收缩之间的关系Fig.7 Relationship between linear chemical shrinkage and autogenous shrinkage of specimen PCG15
    图8 PCG试件24、48、72 h自收缩与线性化学收缩的比例关系Fig.8 Ratio of linear chemical shrinkage to autogenous shrinkage of PCG specimens at 24, 48, 72 h
    图9 PCG掺量对CSA水泥浆体的干燥收缩及其变化速率的影响Fig.9 Influence of PCG content on drying shrinkage and its change rate of CSA cement paste
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黄浩然,廖宜顺,江国喜,廖国胜,梅军鹏.磷建筑石膏对硫铝酸盐水泥熟料收缩特性的影响[J].建筑材料学报,2022,25(9):893-900

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  • 收稿日期:2021-07-27
  • 最后修改日期:2021-10-07
  • 在线发布日期: 2022-09-30
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