人造骨料表面改性改善混凝土界面过渡区性能研究

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (5): 1615-1622.

所属专题：水泥混凝土

人造骨料表面改性改善混凝土界面过渡区性能研究

陈伟^1,2, 宋金源^1,3, 段平⁴, 陈琴⁵, 唐佩¹

1.武汉理工大学硅酸盐建筑材料国家重点实验室,武汉 430070;
2.湖北三峡实验室,宜昌 443007;
3.武汉理工大学材料科学与工程学院,武汉 430070;
4.中国地质大学(武汉)材料与化学学院,武汉 430074;
5.武汉市汉阳市政建设集团有限公司,武汉 430050

收稿日期:2023-01-14 修订日期:2023-03-01 出版日期:2023-05-15 发布日期:2023-06-01
通信作者: 唐佩,博士,研究员。E-mail:pei-tang@whut.edu.cn
作者简介:陈伟(1976—),男,博士,教授。主要从事生态建筑材料方面的研究。E-mail:chen.wei@whut.edu.cn
基金资助:
国家自然科学基金(52108245);湖北省重点研发计划(2020BAB065);湖北三峡实验室开放/创新基金(SC211004);武汉市知识创新专项-曙光计划;深圳市科技计划项目协同创新专项(CJGJZD20200617102601003)

Study on Surface Modification of Artificial Aggregate to Improve Performance of Concrete Interfacial Transition Zone

CHEN Wei^1,2, SONG Jinyuan^1,3, DUAN Ping⁴, CHEN Qin⁵, TANG Pei¹

1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China;
2. Hubei Three Gorges Laboratory, Yichang 443007, China;
3. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China;
4. Facluty of Materials Science and Chemistry, China University of Geosciences (Wuhan), Wuhan 430074, China;
5. Wuhan Hanyang Municipal Construction Group Company Limited, Wuhan 430050, China

Received:2023-01-14 Revised:2023-03-01 Online:2023-05-15 Published:2023-06-01

摘要/Abstract

摘要： 针对混凝土用人造骨料表面疏松多孔和水泥浆体结合能力不足的问题,提出包覆和表面疏水特性修饰的新方法处理人造骨料。试验将不同质量分数的硅烷偶联剂溶液与有机硅树脂联合改性应用于碳化养护的人造骨料,研究改性方法对人造骨料吸水率、颗粒强度、骨料-水泥砂浆黏结强度等性能的影响规律,利用细观/微观测试分析方法表征改性前后人造骨料的微观结构以及人造骨料与水泥砂浆的界面形貌。结果表明,较单一使用化学溶液改性人造骨料,联合改性方法可显著优化人造骨料的表面微观结构,提升骨料性能,骨料吸水率可降低至1.74%。当硅烷偶联剂质量分数为5%时,人造骨料表面形成厚度合适的改性层,人造骨料与水泥砂浆的结合程度显著提升。

关键词: 固体废弃物, 人造骨料, 表面改性, 界面过渡区, 物理性能, 微观形貌

Abstract: A new method of coating and surface hydrophobic modification was proposed to treat artificial aggregate aiming at solving the problems of loose and porous surface of artificial aggregate and insufficient binding with cement paste in concrete. Different mass fractions of silane coupling agent solution and silicone resin were used to modify the artificial aggregate of carbonation curing. The effects of modification methods on the water absorption rate, particle strength of artificial aggregate and bond strength of aggregate-cement mortar were studied, and the microstructure of artificial aggregate and the interface morphology between artificial aggregate and cement mortar before and after modification were characterized by meso/micro test analysis methods. The results show that compared with the single use of chemical solution to modify artificial aggregate, the combined modification method significantly optimizes the surface microstructure of artificial aggregate and improves the aggregate performance, and the water absorption rate of aggregate is reduced to 1.74%. When the mass fraction of silane coupling agent is 5%, a modified layer with appropriate thickness is formed on the surface of artificial aggregate, and the binding property between artificial aggregate and cement mortar is significantly improved.

Key words: solid waste, artificial aggregate, surface modification, interfacial transition zone, physical property, microstructure

中图分类号:

TU528.041

陈伟, 宋金源, 段平, 陈琴, 唐佩. 人造骨料表面改性改善混凝土界面过渡区性能研究[J]. 硅酸盐通报, 2023, 42(5): 1615-1622.

CHEN Wei, SONG Jinyuan, DUAN Ping, CHEN Qin, TANG Pei. Study on Surface Modification of Artificial Aggregate to Improve Performance of Concrete Interfacial Transition Zone[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(5): 1615-1622.

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人造骨料表面改性改善混凝土界面过渡区性能研究

Study on Surface Modification of Artificial Aggregate to Improve Performance of Concrete Interfacial Transition Zone

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