盐类侵蚀作用对超高性能混凝土（UHPC）在西部盐渍土环境下性能影响研究

郭晓锋; 宋海奎; 庾宏亮; 杨子凡; 常海娜; 梁全策

doi:10.3724/j.gyjzG24050805

盐类侵蚀作用对超高性能混凝土（UHPC）在西部盐渍土环境下性能影响研究

doi: 10.3724/j.gyjzG24050805

1. 三门峡市昌通路桥建设有限责任公司, 河南三门峡 472000;
2. 西安建筑科技大学材料科学与工程学院, 西安 710055

基金项目:

国家自然科学基金面上项目（51878549）；陕西省杰出青年科学基金项目（2022JC-20）。

详细信息

作者简介:
郭晓锋，工程师，289357292@qq.com。

通讯作者:
杨子凡，yangzf0925@163.com。

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- 被引次数: 0
出版历程
- 收稿日期: 2024-05-08
- 网络出版日期: 2025-07-15

Research on the Effect of Salt Erosion on the Performance of UHPC in Western Saline Soil Environments

1. Changtong Road & Bridge Construction Co., Ltd. of Sanmenxia, Sanmenxia 472000, China;
2. College of Materials and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China

摘要

摘要: 盐渍土环境中含有大量硫酸盐与氯盐等侵蚀盐类，将对超高性能混凝土（UHPC）的性能产生重要影响。通过制定西部盐渍土环境侵蚀模拟制度，设计了室内加速侵蚀试验，探究了硫酸盐侵蚀与硫酸盐-氯盐复合侵蚀作用下UHPC的性能劣化规律，并结合X射线衍射（XRD）、热重分析、扫描电镜及压汞分析等微观测试方法揭示UHPC在不同盐类侵蚀作用下的劣化机理。结果表明：相较于未侵蚀试件，在硫酸盐-氯盐复合侵蚀240 d后，其抗压强度、抗折强度、等效弯曲韧性与相对动弹性模量分别降低了7.36%、25.49%、10.87%及97.83%；复合盐侵蚀末期，试件的钙矾石与石膏特征峰强于硫酸盐侵蚀，且内部生成大量针棒状钙矾石晶体，产生的膨胀应力导致结构内部出现较多贯穿裂缝及连通孔隙；复合盐侵蚀后试件毛细孔与大孔等有害孔比例增加，凝胶孔数量相对减少，对孔结构的影响大于硫酸盐侵蚀试件。
- 盐渍土环境 /
- 超高性能混凝土 /
- 复合盐侵蚀 /
- 力学性能 /
- 劣化机理
Abstract: Saline soil environments contain large amounts of erosion salts such as sulfates and chloride salts， which will have an important impact on the performance of UHPC. In this paper， an environmental erosion simulation system for western saline soils was formulated， and indoor accelerated erosion tests were designed to explore the performance degradation laws of UHPC under sulfate erosion and sulfate-chloride composite erosion. Microscopic testing methods such as XRD， TG-DTG， SEM and MIP revealed the degradation mechanism of UHPC under different salt erosion conditions. The results showed that after 240 d of sulfate-chloride composite erosion， the surface of the specimen appeared to flake off， and more holes were produced and a large number of salt crystals were precipitated. Compared with the uneroded specimen， its compressive strength， flexural strength， equivalent bending toughness and relative dynamic elastic modulus were reduced by 7.36%， 25.49%， 10.87%， and 97.83%， respectively. At the end of composite salt erosion， the characteristic peaks of ettringite and gypsum in the specimen were stronger than those under sulfate erosion condition， and a large number of needle-like ettringite crystals were formed inside， and the expansion stress generated led to the appearance of more penetrating cracks and connected pores inside the structure. After composite salt erosion， the proportion of harmful pores such as capillary pores and macropores increased， while the number of gel pores decreased relatively， which had a greater impact on the pore structure than the sulfate-eroded specimen.
- saline soil environment /
- ultra-high performance concrete /
- composite salt erosion /
- mechanical properties /
- deterioration mechanism

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