Abstract: Long-term sulfate corrosion can cause the degradation of concrete structure, and the composite structure of fiber reinforced polymer (FRP) and concrete has good corrosion resistance. The corrosion tests were carried out for short concrete filled GFRP tube columns by sulfate immersion and dry-wet cycle. Through apparent phenomenon observation, mass loss measurement and ultrasonic detection etc., the structure changes of composite columns under the action of sulfate were studied. The ultimate bearing capacity and load-strain curves were tested by axial compression tests, and the evolution law of axial compression performance of short concrete filled GFRP tube columns was compared and analyzed. The results show that in the sulfate environment, GFRP tube can resist sulfate erosion, effectively protecting concrete and ensuring the compressive strength of composite columns. The strength and ductility of short concrete filled GFRP tube columns are reduced by sulfate immersion and dry-wet cycle. Moreover, with the increase of corrosion time, the sulfate dry-wet cycle action causes more defects on the short concrete filled GFRP tube column than the sulfate immersion action does, and the synergistic effect between GFRP tube and concrete is slightly reduced.

Key words: bridge engineering; sulfate solution; short concrete filled GFRP tube column; axial compression performance; dry-wet cycle

摘要： 硫酸盐长期腐蚀会导致混凝土结构性能退化，纤维增强聚合物（FRP）与混凝土组合结构具有良好的抗腐蚀性能。对玻璃纤维增强聚合物（GFRP）管混凝土短柱采用硫酸盐浸泡和干湿循环两种作用方式开展腐蚀试验，通过表观现象观察、质量损失测试、超声探测等，研究组合柱在硫酸盐作用下结构变化特征；开展轴压试验，测试极限承载力与荷载-应变曲线，对比分析GFRP管混凝土短柱轴压性能演化规律。结果表明：在硫酸盐环境中，GFRP管能抵抗硫酸盐的侵蚀，有效保护混凝土，确保组合柱抗压强度。硫酸盐溶液浸泡和干湿循环作用降低了GFRP管混凝土短柱的强度以及延性，且随着腐蚀时间的增加，硫酸盐干湿循环作用比浸泡作用下对GFRP管混凝土短柱造成的缺陷更多，GFRP管与混凝土协同作用略微降低。

关键词: 桥梁工程；硫酸盐溶液；GFRP管混凝土短柱；轴压性能；干湿循环