摘要
超高性能海水海砂混凝土(Ultra-high Performance Seawater and Sea-sand Concrete,UHPSSC)是一种极具潜力的海洋工程建设材料。它直接利用丰富的海水和海砂资源,不仅能够缓解海洋工程中淡水与河砂资源匮乏的困境,其固有的致密微观结构还能有效减缓氯离子的侵蚀,提高结构耐久性。然而,其固有的高脆性在一定程度上限制了应用。为克服这一局限,本研究旨在通过引入不锈钢纤维以改善其韧性,系统探究水胶比与纤维掺量对UHPSSC力学性能的协同影响规律。结果表明,当水胶比为0.20且不锈钢纤维体积掺量为2%时,为本研究9组配合比中的最佳配合比。最佳配合比可使UHPSSC的轴心抗压强度值提高22.57%,抗折强度值提高46.32%,流动度为260 mm,弹性模量为41.17 GPa,脆性系数为6.12。因此,本研究制备出力学性能优异的不锈钢纤维增强超高性能海水海砂混凝土,不仅为解决海水海砂中氯离子侵蚀难题提供了有效途径,也为海洋资源的直接与高值化利用奠定了重要的理论与实验基础。
Ultra-high Performance Seawater and Sea-sand concrete represents a highly promising material for marine engineering construction.By directly utilizing abundant seawater and seasand resources,it not only alleviates the scarcity of freshwater and river sand in marine projects but also effectively mitigates chloride ion corrosion through its inherently dense microstructure,thereby enhancing structural durability.However,its inherent high brittleness has somewhat limited its application.To overcome this limitation,this study aims to enhance its toughness by introducing stainless steel fibers,systematically investigating the synergistic effects of water-to-binder ratio and fiber content on the mechanical properties of UHPSSC.Results indicate that a water-to-binder ratio of 0.20 and a stainless steel fiber volume content of 2%represent the optimal mix design among the nine tested formulations.This optimal mix design increased the axial compressive strength of UHPSSC by 22.57%and flexural strength by 46.32%,with a flow value of 260 mm,elastic modulus of 41.17 GPa,and brittleness coefficient of 6.12.Therefore,the preparation of stainless steel fiber-reinforced ultra-high performance seawater sea sand concrete with excellent mechanical properties in this study not only provides an effective solution to the challenge of chloride ion corrosion in seawater sea sand but also lays a crucial theoretical and experimental foundation for the direct and high-value utilization of marine resources.
作者
罗国华
宋钰莹
米召
伍超军
黄雅娟
朱政
蒲弘胤
钟晨希
LUO Guo-hua;SONG Yu-ying;MI Zhao;WU Chao-jun;HUANG Ya-juan;ZHU Zheng;PU Hong-yin;ZHONG Chen-xi(Guangdong Yonghe Construction Group Co.,Ltd.,Maoming 525400;Guangdong University of Technology,Guangzhou 510006;Guangzhou Taihe Concrete Co.,Ltd.,Guangzhou 510080)
出处
《广州建筑》
2025年第12期76-83,共8页
Guangzhou Architecture
基金
广东工业大学-广东永和建设集团有限公司校企产学研合作项目(23HK0171)
广东工业大学-广州市泰和混凝土有限公司校企产学研合作项目(25HK0371)。
关键词
超高性能海水海砂混凝土
不锈钢纤维
工作性能
力学性能
ultra-high performance seawater sea-sand concrete
stainless steel fibers
workability
mechanical propertie
