氢氧化钙对碱矿渣材料硫酸盐结晶破坏的抑制机理
作者:
作者单位:

1.桂林理工大学 土木与建筑工程学院,广西 桂林 541004;2.桂林理工大学 广西建筑新能源与节能重点实验室,广西 桂林 541004;3.桂林理工大学 广西北部湾绿色海工材料工程研究中心,广西 桂林 541004;4.桂林理工大学 广西工业废渣建材资源利用工程技术研究中心, 广西 桂林 541004;5.桂林理工大学 有色金属矿产勘查与资源高效利用省部共建协同创新中心,广西 桂林 541004

作者简介:

李 青(1986—),男,江苏徐州人,桂林理工大学讲师,博士. E-mail: liqing@glut.edu.cn

通讯作者:

尹 霞(1984—),女,湖北汉川人,桂林理工大学实验师,硕士. E-mail: yinxia@glut.edu.cn

中图分类号:

TU528.33

基金项目:

国家自然科学基金资助项目(52268039);广西青年科学基金资助项目(2021GXNSFBA220047);广西人才专项(桂科AD22035104);广西建筑新能源与节能重点实验室开放基金资助项目(22-J-21-21,22-J-21-16,22-J-21-24);“十三五”国家重点研发计划项目(2019YFC1906202)


Inhibition Mechanism of Calcium Hydroxide on Sulfate Crystallization Damage of Alkali-Activated Slag Materials
Author:
Affiliation:

1.College of Civil and Architecture Engineering, Guilin University of Technology, Guilin 541004, China;2.Guangxi Key Laboratory of New Energy and Building Energy Saving, Guilin University of Technology, Guilin 541004, China;3.Guangxi Beibu Gulf Engineering Research Center for Green Marine Materials, Guilin University of Technology, Guilin 541004, China;4.Guangxi Engineering and Technology Center for Utilization of Industrial Waste Residue in Building Materials, Guilin University of Technology, Guilin 541004, China;5.Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources in Guangxi, Guilin University of Technology, Guilin 541004, China

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    摘要:

    通过外观变化和质量损失的发展研究了Ca(OH)2对碱矿渣材料硫酸盐结晶破坏的抑制效率,结合抗压强度、毛细孔隙率、X射线衍射、综合热分析和扫描电子显微镜,揭示了Ca(OH)2对碱矿渣材料硫酸盐结晶破坏的抑制机理.结果表明:质量分数为5%的Ca(OH)2使碱矿渣水泥石的微结构变得致密,降低其毛细孔隙率和毛细吸水系数,显著减小碱矿渣材料的硫酸盐结晶破坏;质量分数为10%的Ca(OH)2使碱矿渣水泥石内部的微裂纹增多,毛细孔隙率和毛细吸水系数增大,对抑制硫酸盐结晶破坏不利.

    Abstract:

    The inhibition efficiency of calcium hydroxide on sulfate crystallization damage of alkali-activated slag material was studied by observing the development of appearance change and mass loss of alkali slag mortars. The inhibition mechanism of calcium hydroxide on sulfate crystallization damage of alkali-activated slag material was revealed through measurement of compressive strength and capillary porosity of alkali-activated slag pastes, combined with X-ray diffraction, integrated thermal analyzer and scanning electron microscope. The results show that an appropriate amount of calcium hydroxide (5%) can significantly reduce the sulfate crystallization damage of alkali-activated slag material by compacting the microstructure and reducing the capillary porosity and capillary pore water absorption coefficient of alkali-activated slag cement stone. Excessive calcium hydroxide(10%) increases the internal microcracks, capillary porosity and capillary water absorption coefficient of alkali-activated slag cement stone, which is unfavorable to the inhibition of sulfate crystallization damage of alkali-activated slag material.

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李青,姚凯,李俊潼,陈平,尹霞.氢氧化钙对碱矿渣材料硫酸盐结晶破坏的抑制机理[J].建筑材料学报,2023,26(4):437-442

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  • 收稿日期:2022-03-09
  • 最后修改日期:2022-04-18
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  • 在线发布日期: 2023-05-08
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