骨料包浆预处理对礁石混凝土性能的影响

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (10): 3436-3444.

骨料包浆预处理对礁石混凝土性能的影响

朱兆坤, 高旭, 范小春, 蓝少丁, 赵东三

武汉理工大学土木工程与建筑学院,武汉 430070

收稿日期:2022-06-25 修回日期:2022-07-24 出版日期:2022-10-15 发布日期:2022-10-26
通讯作者: 高旭,博士,教授。E-mail:x.gao@whut.edu.cn
作者简介:朱兆坤(1997—),男,硕士研究生。主要从事生态混凝土方面的研究。E-mail:1401799171@qq.com
基金资助:
国家自然科学基金青年科学基金(52108244);武汉理工大学三亚科教创新园开放基金(2020KF0008)

Effect of Aggregate Coating Pretreatment on Properties of Reef Concrete

ZHU Zhaokun, GAO Xu, FAN Xiaochun, LAN Shaoding, ZHAO Dongsan

School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China

Received:2022-06-25 Revised:2022-07-24 Online:2022-10-15 Published:2022-10-26

摘要/Abstract

摘要： 本文对比研究了不同礁石骨料包浆预处理方法以及高性能包浆胶凝材料对礁石骨料物理性质、氯离子溶出行为以及力学性能的影响;并将包浆预处理后的礁石骨料用于制备礁石混凝土,讨论了包浆预处理和骨料替代率对礁石混凝土力学性能、氯离子渗透特性以及体积稳定性的影响。结果表明,包浆静置后烘干较包浆后自然风干与包浆后标准养护的预处理方式具有最好的骨料改性效果,礁石骨料的空隙率、吸水率、压碎值以及氯离子溶出特性等均被优化。当礁石骨料以20%、40%、60%体积替代率掺入混凝土中时,包浆礁石混凝土28 d抗压强度较未包浆礁石混凝土分别提高了6.67%、15.40%、20.05%,氯离子扩散系数分别降低了6.25%、17.31%、38.10%,干燥收缩率分别降低了5.81%、17.05%、24.43%。礁石骨料经过包浆后改变了其与水泥砂浆之间的界面过渡区,进而改善了礁石混凝土的力学性能、氯离子渗透性能以及体积稳定性。

关键词: 礁石骨料, 礁石混凝土, 包浆预处理, 氯离子溶出, 体积稳定性, 界面过渡区

Abstract: In this paper, the effects of different pretreatment methods and high performance coating cementitious materials on physical properties, chloride ion dissolution behavior and mechanical properties of reef aggregate were studied. The reef aggregate pretreated by coating was used to prepare reef concrete, and the effects of pretreatment method and aggregate replacement level on the mechanical properties, chloride ion permeability and volume stability of reef concrete were discussed. The results show that the pretreatment method of standby after evenly coated the aggregate with slurry and then drying in oven exhibits the best aggregate modification results than other pretreatment methods, and the technical properties of reef aggregate such as void fraction, water absorption, crushing value and chloride ion dissolution characteristics are optimized. When the reef aggregate is added into concrete with the volume replacement of 20%, 40% and 60%, comparing with uncoated reef concrete, the compressive strength of coated reef concrete increases by 6.67%, 15.40% and 20.05% at 28 d, the diffusion coefficient of chloride ion decreases by 6.25%, 17.31% and 38.10%, and the drying shrinkage reduces by 5.81%, 17.05% and 24.43%, respectively. After coating, the interface transition zone between reef aggregate and cement mortar is modified, and the mechanical properties, chloride ion permeability and volume stability of reef concrete are improved.

Key words: reef aggregate, reef concrete, coating pretreatment, chloride ion dissolution, volumetric stability, interfacial transition zone

中图分类号:

TU528

朱兆坤, 高旭, 范小春, 蓝少丁, 赵东三. 骨料包浆预处理对礁石混凝土性能的影响[J]. 硅酸盐通报, 2022, 41(10): 3436-3444.

ZHU Zhaokun, GAO Xu, FAN Xiaochun, LAN Shaoding, ZHAO Dongsan. Effect of Aggregate Coating Pretreatment on Properties of Reef Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(10): 3436-3444.

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