Study on chloride penetration resistance of hybrid fiber-reinforced concrete in winter construction

IF 3.4 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Materials and Structures Pub Date : 2024-12-26 DOI:10.1617/s11527-024-02552-2

Yi Li, Mudan Qi, Shengpeng Ji

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Abstract

Chloride penetration resistance is an important indicator of durability, while the tortuosity of the pore structure affects the penetration path of chloride. However, the actual migration paths of chloride are complex and numerous, obtaining the actual migration path is a difficult process. This study proposed to quantify pore tortuosity using the shortest penetration path obtained from pore structure scans, investigated the mechanism of the effect of winter construction curing measures and fibers on the chloride penetration resistance based on the pore tortuosity. Three types of concrete were prepared: plain concrete (C), basalt-polypropylene fiber-reinforced concrete (BP) and steel-polypropylene fiber-reinforced concrete (SP), three curing conditions were set up in severe cold conditions: no winter construction curing measures (NWCM-1), adoption of winter construction curing measures (AWCM-2) and standard curing measures (SCM-3). Pore structure scans were performed and chloride migration coefficient were tested, the shortest penetration path and pore tortuosity were calculated. This study used the chloride migration coefficient as the basis for evaluating durability, experimental results showed that the highest durability was obtained by the adoption of winter construction curing measures. The pore tortuosity was calculated based on the shortest penetration path of chloride, was highly negatively correlated with the chloride migration coefficient, with a relevant coefficient of 0.902. Winter construction curing measures improved durability by reducing the porosity of the material and increasing the pore tortuosity. Adding fibers had the opposite effect.

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混杂纤维增强混凝土冬季施工抗氯离子渗透性能研究

抗氯离子渗透性能是耐久性能的重要指标，而孔隙结构的弯曲度影响着氯离子的渗透路径。然而，氯化物的实际迁移路径是复杂和众多的，获得实际迁移路径是一个困难的过程。本研究提出利用孔隙结构扫描获得的最短渗透路径来量化孔隙扭曲度，并基于孔隙扭曲度研究了冬季施工养护措施和纤维对氯离子渗透阻力的影响机理。配制了素混凝土(C)、玄武岩-聚丙烯纤维增强混凝土（BP）和钢-聚丙烯纤维增强混凝土（SP）三种混凝土，在严寒条件下设置了无冬季施工养护措施（NWCM-1）、采用冬季施工养护措施（AWCM-2）和标准养护措施（SCM-3）三种养护条件。进行了孔隙结构扫描，测试了氯离子迁移系数，计算了最短渗透路径和孔隙弯曲度。本研究以氯离子迁移系数作为评价耐久性的依据，试验结果表明，采用冬季施工养护措施获得的耐久性最高。基于氯离子最短渗透路径计算孔隙扭曲度，与氯离子迁移系数呈高度负相关，相关系数为0.902。冬季施工养护措施通过降低材料孔隙率和增加孔隙扭曲度来提高耐久性。添加纤维则产生相反的效果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials and Structures 工程技术-材料科学：综合

CiteScore

6.40

自引率

7.90%

发文量

222

审稿时长

5.9 months

期刊介绍： Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.