海水浸泡对FRP筋-珊瑚混凝土粘结性能的影响  

Effects of sea water soaking on the bonding properties of FRP bars-coral concrete

作　　者：王磊[1,2] 李威 陈爽 毛亚东[1] 王恺[1] WANG Lei;LI Wei;CHEN Shuang;MAO Yadong;WANG Kai(School of Civil and Architectural Engineering, Guilin 541004, China;Key Laboratory of Geotechnical Mechanics and Engineering in Guangxi, Guilin 541004, China)

机构地区：[1]桂林理工大学土木与建筑工程学院,桂林541004 [2]广西岩土力学与工程重点实验室,桂林541004

出　　处：《复合材料学报》2018年第12期3458-3465,共8页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(51568013;51868014);广西高等学校高水平创新团队及卓越学着计划(2017)

摘　　要：开展了30℃海水浸泡条件下玻璃纤维增强树脂基复合材料(GFRP)筋、碳纤维增强树脂基复合材料(CFRP)筋与珊瑚混凝土粘结性能的试验研究,分析了纤维增强树脂基复合材料(FRP)筋-珊瑚混凝土粘结滑移曲线特征、破坏形态及粘结强度变化。试验结果表明,海水浸泡后FRP筋力学性能和粘结性能均表现为不同程度的降低。随浸泡时间增加,GFRP筋表层树脂与纤维间的孔隙率明显增大,并逐渐出现脱粘现象,纤维本身遭受到侵蚀,而CFRP筋仅表面基体有少许损伤,其耐久性明显优于GFRP筋;FRP筋-珊瑚混凝土粘结强度呈现出先增加后减小的趋势,且后期下降速率逐渐变小,部分GFRP筋-珊瑚混凝土试件的破坏模式逐渐由筋被拔出转变为筋材断裂;增加保护层厚度能有效地减缓海水对GFRP筋的侵蚀,有利于保持GFRP筋-珊瑚混凝土间的粘结性能。The experimental study on the bond properties of glass fiber reinforced polymer(GFRP)bars and coral concrete,carbon fiber reinforced plomer(CFRP)bars and coral concrete under sea water immersion at 30℃ was carried out.The characteristics of bond slip curves,failure modes and bond strength of fiber reinforced polymer(FRP)bars-coral concrete were analyzed.The results show that the mechanical properties and adhesive properties of FRP bars decrease in different degrees after immersion in seawater.With the increase of soaking time,the porosity between surface resin and fiber increases evidently,the phenomenon of debonding occurrs gradually,and the fiber itself is that of GFRP bars.The ultimate bond strength of FRP bars-coral concrete shows a trend to increase at first and then decreases and the later falling rate gradually becomes smaller.The failure modes of some GFRP bars-coral concrete specimens gradually change into bar fracture from pull-out.Increasing the cover thickness of coral concrete could reduce the erosion of the sea water to the FRP bars effectively,and helps to maintain the bond performance of the GFRP bars-coral concrete.

关 键 词：粘结性能 拉拔试验 FRP筋 珊瑚混凝土 耐久性 海洋环境 

分 类 号：TB302[一般工业技术—材料科学与工程] TU528.59[建筑科学—建筑技术科学]