ISSN 1008-5548

CN 37-1316/TU

最新出版

再生细骨料-超高性能混凝土的抗氯盐侵蚀性能

Chloride ion resistance of recycled fine aggregate-ultra-high performance concrete


马志鹏a, 许祺祺a, 吴晨洁a, 王德志ab

宁夏大学 a.土木与水利工程学院, b.旱区现代农业水资源高效利用教育部工程研究中心, 宁夏 银川 750021


引用格式:

马志鹏, 许祺祺, 吴晨洁, 等. 再生细骨料-超高性能混凝土的抗氯盐侵蚀性能[J]. 中国粉体技术, 2026, 32(4): 1-10.

Ma Zhipeng, Xu Qiqi, Wu Chenjie, et al. Chloride ion resistance of recycled fine aggregate-ultra-high performance concrete[J]. China Powder Science and Technology, 2026, 32(4): 1-10.

DOI:10.13732/j.issn.1008-5548.2026.04.009

收稿日期: 2025-10-10, 修回日期: 2026-04-02,上线日期: 2026-06-08。

基金项目 国家自然科学基金项目, 编号: 52368037, 51968060; 宁夏重点研发计划项目, 编号: 2022BEE03001; 宁夏自然科学基金资助目, 编号: 2023AAC03040; 宁夏一流学科建设计划项目, 编号: NXYLXK2021A03。

第一作者: 马志鹏(2000—),男(回族),硕士生,研究方向为超高性能混凝土。E-mail:908573077@qq.com。

通信作者: 王德志(1981—),男,教授,博士,博士生导师,研究方向为混凝土抗冻、抗裂、耐久性能机理。E-mail:wangdzh@nxu.edu.cn。


摘要:【目的】为了减轻氯盐对再生细骨料-超高性能混凝土(recycled fine aggregate-ultra-high performance concrete,RFA-UHPC)的侵蚀,防止RFA-UHPC内部结构的劣化,提高RFA-UHPC的耐久性能,对RFA-UHPC的抗氯盐侵蚀性能进行深入研究。【方法】首先采用RFA取代质量分数为50%的天然砂制备RFA-UHPC;然后进行抗氯盐侵蚀性能试验,将各试样浸泡于NaCl的质量分数分别为0、3%、7%、10%的溶液中,浸泡总时间设为900 d,制得4种被氯盐侵蚀程度不同的RFA-UHPC试样;随后进行力学性能试验,测试各试样的失质量分数、相对弹性模量、抗压强度以及氯离子质量分数,测试各试样的物相组成与微观形貌;最后分析NaCl的质量分数对RFA-UHPC的力学性能、抗氯盐侵蚀性能以及微观形貌的影响。【结果】当浸泡时间为900 d、 NaCl质量分数为10%时,RFA-UHPC的失质量分数为0.57%,相对动弹性模量为76%,抗压强度为97.7 MPa,在厚度为0~3 mm的表层内的氯离子质量分数最大可达0.90%,RFA-UHPC的碳化反应达到最大,C-S-H凝胶结构的变化最为显著。【结论】在高浓度氯盐侵蚀条件下,RFA-UHPC内部的碳化反应程度逐渐加剧,抑制钙矾石的生成,C-S-H凝胶主体结构发生改变,界面过渡区逐渐劣化并伴随微裂纹与孔隙的扩展,从而对RFA-UHPC宏观耐久性产生不利影响,但基体中C-S-H凝胶的致密结构依然能有效延缓氯盐侵蚀的深入,保障RFA-UHPC整体结构的完整性与稳定性。

关键词:再生细骨料;超高性能混凝土;长龄期;氯盐侵蚀;力学性能

Abstract

Objective To mitigate chloride attack on recycled fine aggregate-ultra-high performance concrete (RFA-UHPC), prevent deterioration of its internal structure, and improve its durability, an in-depth investigation is conducted into the resistance of RFA-UHPC to chloride attack.

Methods Firstly, RFA-UHPC was prepared by replacing 50% of mass of natural sand with RFA. Secondly, chloride ion resistance tests were conducted. The specimens were immersed in NaCl solutions with mass fractions of 0%, 3%, 7%, and 10% for a total duration of 900 days, resulting in four types of RFA-UHPC specimens. Thirdly, mechanical property tests were performed to determine the mass loss fraction, relative dynamic elastic modulus, compressive strength, and chloride ion mass fraction of each specimen. Meanwhile, the phase composition and microscopic morphology were characterized. Finally, the influence of NaCl mass fraction on the mechanical properties, chloride ion resistance, and microstructure of RFA-UHPC was analyzed.

Results and Discussion As the immersion time and NaCl mass fraction increased, the mass loss fraction of RFA-UHPC gradually increased, while the relative dynamic elastic modulus and compressive strength gradually decreased. When the immersion time was 900 days and the NaCl mass fraction was 10%, the mass loss fraction of RFA-UHPC was 0.57%, the relative dynamic elastic modulus was 76%, and the compressive strength was 97.7 MPa. The chloride ion mass fraction inside RFA-UHPC decreased with increasing depth from the surface and increased with increasing NaCl mass fraction. When the immersion time was 900 days and the NaCl mass fraction was 10%, the chloride ion mass fraction in the 0-3 mm surface layer of the RFA-UHPC specimen reached its maximum value of 0.90%. Furthermore, when the NaCl mass fraction was 10%, the carbonation reaction of RFA-UHPC reached its maximum, and the alteration of the C-S-H gel structure was the most significant.

Conclusion Under high-concentration chloride attack, the carbonation reaction inside RFA-UHPC gradually intensifies, inhibiting the formation of ettringite and altering the main structure of the C-S-H gel. The interfacial transition zone gradually deteriorates, accompanied by the propagation of microcracks and pores, which adversely affects the macroscopic durability of RFA-UHPC. However, the dense structure of the C-S-H gel in the matrix can still effectively delay further penetration of chloride ions, ensuring the integrity and stability of the overall RFA-UHPC structure.

Keywords: recycled fine aggregate; ultra-high performance concrete;chloride attack; mechanical properties


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