Modifying effects and mechanisms of superfine stainless wires on microstructures and mechanical properties of ultra-high performance seawater sea-sand concrete

IF 4.4 2区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY
Feng Yu, SuFen Dong, Ashraf Ashour, SiQi Ding, BaoGuo Han
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Abstract

Ultra-high-performance seawater sea-sand concrete (UHPSSC) presents a prospective solution to address the natural resource shortage in marine infrastructure construction. To eliminate the corrosion risk of steel fibers and broaden the applicability of UHPSSC, this study investigates the mechanical properties and free chloride ion content as well as microstructures of UHPSSC reinforced with superfine stainless wires (SSWs) under natural curing. The results indicate that 1.5% SSWs can remarkably improve the flexural strength and toughness of UHPSSC by 127% and 1724%, respectively, and mitigate the long-term strength degradation of UHPSSC. The strong interfacial bond between SSW and UHPSSC improves the compactness of UHPSSC, thus reducing the growth space for Ca(OH)2 crystals and swelling hydration products generated by sulfate and magnesium ions. This can be supported by the observed reduction in the Ca/Si ratio of C–S–H gels, CH crystal orientation index, and porosity. Moreover, through mechanisms such as pull-out, rupture, overlapping network, and internal anchor interface, SSWs effectively prevent microcrack growth and propagation, transforming single long-connected microcracks into multiple-emission microcracks centered on SSW. Additionally, the free chloride ion content of the composites at 28 and 180 d meets the ACI 318-19 standard requirements for concrete exposed to seawater. This compliance is attributed to the chloride immobilization facilitated by Friedel’s salt and C–S–H gels within the interfaces around SSWs and sea-sand. Consequently, SSWs-reinforced UHPSSC exhibits considerable potential for applications in sustainable marine infrastructures, demanding long-term mechanical properties and high durability.

超细不锈钢丝对超高性能海水海砂混凝土微观结构和力学性能的改性效应和机制
超高性能海水海砂混凝土(UHPSSC)是解决海洋基础设施建设中自然资源短缺问题的一种前瞻性解决方案。为了消除钢纤维的腐蚀风险并扩大 UHPSSC 的适用范围,本研究对自然养护条件下用超细不锈钢丝(SSWs)增强的 UHPSSC 的力学性能、游离氯离子含量以及微观结构进行了研究。结果表明,1.5% 的超细不锈钢丝能显著提高 UHPSSC 的抗弯强度和韧性,分别提高 127% 和 1724%,并能缓解 UHPSSC 的长期强度退化。SSW 与 UHPSSC 之间的强界面键提高了 UHPSSC 的致密性,从而减少了 Ca(OH)2 晶体以及硫酸根离子和镁离子产生的膨胀水化产物的生长空间。从观察到的 C-S-H 凝胶的 Ca/Si 比率、CH 晶体取向指数和孔隙率的降低可以证明这一点。此外,通过拉出、破裂、重叠网络和内部锚界面等机制,SSW 可有效阻止微裂纹的生长和扩展,将单个长连接微裂纹转变为以 SSW 为中心的多发射微裂纹。此外,复合材料在 28 d 和 180 d 时的游离氯离子含量符合 ACI 318-19 标准对暴露于海水中的混凝土的要求。这要归功于弗里德尔盐和 C-S-H 凝胶在 SSW 和海砂周围的界面上对氯离子的固定作用。因此,由 SSWs 加固的超高强度聚苯乙烯泡沫混凝土在要求长期机械性能和高耐久性的可持续海洋基础设施中具有相当大的应用潜力。
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来源期刊
Science China Technological Sciences
Science China Technological Sciences ENGINEERING, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
8.40
自引率
10.90%
发文量
4380
审稿时长
3.3 months
期刊介绍: Science China Technological Sciences, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science China Press, is committed to publishing high-quality, original results in both basic and applied research. Science China Technological Sciences is published in both print and electronic forms. It is indexed by Science Citation Index. Categories of articles: Reviews summarize representative results and achievements in a particular topic or an area, comment on the current state of research, and advise on the research directions. The author’s own opinion and related discussion is requested. Research papers report on important original results in all areas of technological sciences. Brief reports present short reports in a timely manner of the latest important results.
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