中文摘要：

以碳纤维复材约束混凝土为研究对象，探讨盐水干湿环境对其抗压性能的影响。基于亚热带气候特征，设计了盐溶液干湿循环加速老化试验系统。制作了5组共60个尺寸为150mm（直径）×300mm（高度）的混凝土圆柱体试件。试验试件按5种干湿循环作用次数（0，60，120，240，360次）进行分组，承受每种循环次数的试件由4种不同层数的碳纤维复材（0，1，2，3层）包裹约束，每种条件制备3个相同的试件。通过实施轴向压缩试验，分析了碳纤维复材约束混凝土经受干湿环境作用后的破坏模式、应力一应变曲线、抗压强度和极限压向应变的变化规律。试验结果表明：经受盐溶液干湿循环后的素混凝土圆柱抗压性能有所提高，而碳纤维复材约束混凝土圆柱的抗压性能下降；与未经受干湿环境作用的试件相比，经过360次干湿循环后，素混凝土圆柱的抗压强度提高9．38％，而包裹1、2、3层碳纤维复材约束混凝土圆柱的抗压强度分别下降12．10％、10．81％、13．88％。

英文摘要：

An experimental study was conducted to investigate the axial compressive performance of CFRP-confined concrete under dry-wet cycling in salt water. Based on the subtropical climate characteristics, a test system of dry-wet cycling accelerated aging was designed in the study. A total of 60 concrete cylinder specimens were casted, the size of which is 150 mm （diameter） x 300 mm （height）. Specimens are divided into 4 groups in accordance with the times of dry-wet cycling （0, 60, 120, 240 and 360）, and the specimens of each group were confined by different layers of CFRP（O, 1 layer, 2 layers and 3 layers）. Each test condition included 3 same specimens. Based on the axial compressive test, the failure modes, the stress-strain curve, the compressive strength and ultimate axial strain of CFRP-confined concrete were analyzed. The results showed that the compressive property of plain concrete after dry- wet cycling increased, but that of CFRP-confined concrete decreased. Compared with the specimens without dry-wet cycling, the plain concrete after 360 times of dry-wet cycling had an increase of compressive strength by 9.38% , while the compressive strength of the confined concrete with 1, 2, 3 layers of CFRP decreased by 12. 10% , 10.81% and 13.88% , respectively.