摘要
为缓解玄武岩纤维增强复合(BFRP)筋在高碱硅酸盐水泥中易水解、引发力学性能下降的问题,本文采用大体积矿物掺合料制备低碱混凝土,以降低BFRP筋的劣化损伤。结果表明:降低混凝土碱度可以有效提升BFRP筋的耐久性能,高温海水浸泡180 d后,低碱混凝土中BFRP筋的拉伸强度保留率比普通混凝土中BFRP筋高44.5%;低碱混凝土中BFRP筋的内部树脂能有效保护纤维,而普通混凝土中BFRP筋表面泛黄,内部大量树脂水解并析出,腐蚀深度达到1000μm以上。该研究结果为海洋环境高抗蚀BFRP筋增强混凝土的应用提供数据支撑和理论指导。
To mitigate the hydrolysis and mechanical degradation of basalt fiber-reinforced polymer(BFRP)bars in high-alkalinity Portland cement,this study prepared low-alkalinity concrete using large-volume mineral admixtures to reduce degradation damage to BFRP bars.Results indicate that lowering concrete alkalinity significantly enhances the durability of BFRP bars.After 18o days of immersion in high-temperature seawater,BFRP bars in low-alkalinity concrete retained 44.5%higher tensile strength than those in ordinary concrete.The internal resin of BFRP bars in low-alkalinity concrete effectively protected the fibers,whereas bars in ordinary concrete exhibited surface yellowing,significant resin hydrolytic exudation,and corosion depths exceeding 10o0μm.These findings provide data support and theoretical guidance for applying high-corrosion-resistant BFRP bar-reinforced concrete in marine environments.
出处
《混凝土世界》
2025年第7期23-27,共5页
China Concrete
关键词
海洋环境
玄武岩纤维复合筋
耐久性能
劣化机理
Marine environment
basalt fiber-reinforced polymer bars
durability
degradation mechanism
