海洋环境下BFRP筋增强珊瑚混凝土柱抗侵蚀性能

Corrosion Resistance of BFRP Bar Reinforced Coral Concrete Column Under Marine Environment

为探究海洋环境下玄武岩纤维(Basalt fiber reinforced polymer,BFRP)筋的劣化机理、评估BFRP筋增强珊瑚混凝土柱抗侵蚀性的退化程度,对海水环境下BFRP筋、珊瑚混凝土进行受压性能试验。基于材性试验,对12根BFRP筋增强珊瑚混凝土柱进行轴心受压试验,并采用扫描电子显微镜(SEM)对试件破坏后其内部BFRP筋材进行微观试验,检测分析玄武岩纤维、纤维-树脂界面处的化学成分。结果表明:干湿循环条件对BFRP筋的极限承载力影响强于浸泡环境;珊瑚混凝土轴压柱破坏后,其内部筋材均发生了一定程度的腐蚀劣化,构件的承载性能很大程度取决于内部钢筋的锈蚀程度。最后,基于试验结果,分析不同海水腐蚀类别、不同腐蚀周期对构件内部BFRP筋、珊瑚混凝土微观成分的变化规律,探讨不同因素对构件耐久性能的影响机理。

To explore the degradation mechanism of basalt fiber reinforced polymer(BFRP)reinforcement in the marine environment and evaluate the degradation degree of the corrosion resistance of coral concrete column with BFRP reinforced,the compression tests of BFRP bars,coral concrete and coral concrete column with BFRP reinforced were carried out in the marine environment.Based on the material tested results,the axially loaded tests were carried out on 12 coral concrete columns with BFRP bar reinforced.A micro test of scanning electron microscope(SEM)was put forward to measuring the internal BFRP reinforcement and coral concrete of failure members,and the chemical elements of basalt fiber and fiber-resin interface were tested and analyzed.The results showed that the ultimate bearing capacity of BFRP reinforcement was weakened more critically of dry and wet circulation conditions than that of soaking environment.The marine environment had little effect on the compressive performance of coral concrete.The bearing performance of axially loaded members greatly depended on the degree of corrosion and deterioration of internal reinforcement in failure specimens.Subsequently,based on the tested results,the change rules of different seawater corrosion categories and corrosion cycles on the internal BFRP reinforcement surface and the micro-component of coral concrete,and the influence mechanism of different factors on the durability of members were discussed and analyzed.