GFRP筋混凝土柱海水环境受压性能

Compression Performance of GFRP Reinforced Concrete Columns Under Seawater Environment

从新的角度和采用真实的腐蚀条件,首先通过混凝土材料在海洋环境下的腐蚀试验排除海洋环境对混凝土材料的影响,然后对玻璃纤维增强塑料(GFRP)筋体进行腐蚀试验,将不同腐蚀时间的GFRP筋进行绑扎、支模和浇筑,制作成混凝土柱并进行试验。根据相关力学试验结果,对比混凝土构件内筋体腐蚀前后其极限承载力、破坏形态以及筋体腐蚀后构件各项性能的变化情况。结果表明:人工制备的高浓度海水溶液对混凝土材料的力学性能影响不大,有必要排除混凝土保护层对传统腐蚀试验的影响;在柱内筋体受到180d腐蚀的条件下,钢筋混凝土柱的极限承载力保留率下降到70.2%,降低了29.8%;GFRP筋混凝土柱的极限承载力保留率下降到86.5%,降低了13.5%;海水环境下GFRP筋在受压构件中具有比钢筋更好的性能优势和使用价值。

The tests with a new point of view and real corrosion conditions were carried out.First,the effect of marine environment on the concrete material was eliminated through the corrosion test of concrete in the marine environment.Then the corrosion test of the GFRP reinforcement was initiated.The GFRP tendons with different corrosion time were lashed,formed and poured into concrete column and the related tests were carried out.According to the experimental results of the related mechanics test,the ultimate bearing capacity,failure mode of concrete members before and after corrosion,and the changing status of various properties of reinforcement body after corrosion were compared.The results show that the artificial high concentration seawater solution has little influence on mechanical properties of concrete materials.It is essential that overcoming the influence of concrete protection layer on traditional corrosion test.Under the condition of inner tendons corroded for 180 days,the retention rate of ultimate bearing capacity of reinforced concrete column reduces from 100% to 70.2% for about29.8%.The retention rate of ultimate bearing capacity of GFRP-reinforced concrete column reduces from 100% to 86.5% for about 13.5%.It can be found from the experimental results that the compression components in seawater, GFRP tendons are better than rebar in performance and value of application.