摘要
在沿海或海洋环境下,海工结构不断遭受各种劣化因子的侵蚀作用,面临混凝土材料的腐蚀和钢筋锈蚀的问题,结构安全受到威胁。该研究采用无机聚合物替代波特兰水泥,玄武岩纤维筋(BFRP)替代钢筋,并使用海砂海水制备BFRP筋混凝土梁。试验研究了不同配筋率的BFRP无机聚合物海砂海水混凝土梁构件的力学性能、BFRP筋的应力应变、主裂缝的发展(大小及位置)、破坏形式等,并与无机聚合物海砂海水钢筋混凝土梁进行了比较。试验结果表明:相比钢筋混凝土梁,BFRP筋混凝土梁的荷载-挠度曲线并没有明显屈服平台,破坏形式为脆性破坏,但是BFRP筋梁破坏时的预兆依然明显。相同配筋条件下,BFRP筋梁极限承载力要大于钢筋混凝土梁,BFRP筋梁承载力随配筋率增大而增大。
In coastal or marine environments,offshore structures are constantly eroded by various deterioration factors,facing the problems of corrosion of concrete materials and corrosion of steel bars,and the structural safety is threatened.In this study,geopolymer was used to replace Portland cement,basalt fiber bars(BFRP)were used to replace steel bars,and sea sand and seawater were used to prepare BFRP-reinforced concrete beams.The mechanical properties of BFRP inorganic polymer sea sand seawater concrete beam members with different reinforcement ratios,the stress and strain of BFRP bars,the development(size and location)of main cracks,the failure form,etc.,were investigated experimentally.Reinforced concrete beams were compared.The test results show that compared with reinforced concrete beams,the load-deflection curve of BFRP reinforced concrete beams has no obvious yield plateau,and the failure mode is brittle failure,but the omen of failure of BFRP reinforced concrete beams is still obvious.Under the same reinforcement conditions,the ultimate bearing capacity of BFRP reinforced beams is greater than that of reinforced concrete beams,and the bearing capacity of BFRP reinforced beams increases with the increase of reinforcement ratio.
作者
吴清华
陈思可
谢亮
李兆恒
WU Qinghua;CHEN Sike;XIE Liang;LI Zhaoheng(Guangdong Research Institute of Water Resources and Hydropower,Guangzhou 510635,China;Guangdong Provincial Engineering Research Center for Water Conservancy Advanced Material and Structure,Guangzhou 510635,China)
出处
《广东水利水电》
2022年第10期13-18,共6页
Guangdong Water Resources and Hydropower
基金
广东省水利科技创新项目(编号:2015-10)。
关键词
BFRP筋
无机聚合物
海砂海水
力学性能
极限承载力
BFRP bars
Geopolymer
sea sand and sea water
mechanical properties
ultimate bearing capacity
