关键混合参数下超高性能纤维增强混凝土的迁移特性和腐蚀行为

IF 3.6 3区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY International Journal of Concrete Structures and Materials Pub Date : 2024-07-02 DOI:10.1186/s40069-024-00680-1
Shamsad Ahmad, Ashraf A. Bahraq, Amin Al-Fakih, Moruf Olalekan Yusuf, Mohammed A. Al-Osta
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引用次数: 0

摘要

劣质粗集料的存在和暴露在侵蚀性条件下是影响混凝土耐久性的两大问题。因此,与传统混凝土相比,需要一种性能更强的混凝土来防止流体和离子的流动。本研究调查了主要混合参数对超高性能纤维增强混凝土(UHPFRC)的迁移特性和腐蚀行为的影响。根据 33 因子实验设计,制备了一组 27 种不同容重/体积比、水泥和硅灰含量组合的 UHPFRC 混合物,并对其进行了透水性、氯离子渗透性、电阻率、氯离子分布和腐蚀电流密度测试。结果表明,超高压纤维水泥混凝土混合物具有极佳的耐久性能,其特点是透水性可忽略不计(15 毫米),当水胶比为 0.15(100 库仑)和 0.2(300 库仑)时,氯化物渗透性可忽略不计且非常低,钢筋层面的氯化物浓度非常低(0.03-0.18 重量百分比)。所有电阻率值都在 26.7-78.8 kΩ cm(20 kΩ cm)范围内,pH 值为 12.41-13.01,这表明超高压FRC 混合物发生腐蚀的可能性很小。经过 450 天氯化物暴露后,对加固的 UHPFRC 试样进行的腐蚀电流密度测定也证实了这一点,其值低于钢筋开始腐蚀的临界值。最后,对所有列出的试验数据进行了统计分析和拟合,并利用回归分析建立了模型,使回归系数在 0.90-0.99 范围内。
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Transport Characteristics and Corrosion Behavior of Ultra-High Performance Fiber-Reinforced Concrete with the Key Mix Parameters

The presence of low-quality coarse aggregates and exposure to aggressive conditions are the two major problems with the durability of concrete. Therefore, an alternative concrete with enhanced properties to prevent fluid and ionic mobility compared to conventional concrete is needed. This study investigated the effects of main mix parameters on the transport characteristics and corrosion behavior of ultra-high performance fiber-reinforced concrete (UHPFRC). A set of 27 UHPFRC mixtures with different combinations of w/b ratio, cement, and silica fume contents, based on a 33-factorial experiment design, were prepared and tested for water permeability, chloride penetrability, electrical resistivity, chloride profile, and corrosion current density. The results showed that UHPFRC mixtures exhibited excellent durability properties characterized by negligible water penetration (< 15 mm), negligible and very low chloride permeability when the w/b ratio was 0.15 (< 100 Coulombs) and up to 0.2 (< 300 Coulombs), respectively, and very low chloride concentrations at the rebar level (0.03–0.18 wt.%). All resistivity values were within the range of 26.7–78.8 kΩ cm (> 20 kΩ cm) and pH values were 12.41–13.01, indicating the implausible likelihood of corrosion in the UHPFRC mixtures. This was confirmed through the corrosion current density measurements of reinforced UHPFRC specimens after 450 days of chloride exposure, which were below the critical limit for the corrosion initiation of reinforcing steel. Finally, the experimental data were statistically analyzed and fitted for all the listed tests, and models were developed for them using the regression analysis such that regression coefficients were within 0.90–0.99.

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来源期刊
International Journal of Concrete Structures and Materials
International Journal of Concrete Structures and Materials CONSTRUCTION & BUILDING TECHNOLOGY-ENGINEERING, CIVIL
CiteScore
6.30
自引率
5.90%
发文量
61
审稿时长
13 weeks
期刊介绍: The International Journal of Concrete Structures and Materials (IJCSM) provides a forum targeted for engineers and scientists around the globe to present and discuss various topics related to concrete, concrete structures and other applied materials incorporating cement cementitious binder, and polymer or fiber in conjunction with concrete. These forums give participants an opportunity to contribute their knowledge for the advancement of society. Topics include, but are not limited to, research results on Properties and performance of concrete and concrete structures Advanced and improved experimental techniques Latest modelling methods Possible improvement and enhancement of concrete properties Structural and microstructural characterization Concrete applications Fiber reinforced concrete technology Concrete waste management.
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