玻璃纤维织物增强海水海砂混凝土在模拟海洋环境中的耐久性研究  

Research on Durability of Glass Fiber Textile Reinforced Seawater Sea-sand Concrete Exposed to Simulated Marine Environment

作　　者：喻松 胡翔 赵一帆 朱德举 史才军 YU Song;HU Xiang;ZHAO Yifan;ZHU Deju;SHI Caijun(Key Laboratory for Green&Advanced Civil Engineering Materials and Application Technology of Hunan Province,College of Civil Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学土木工程学院,绿色先进土木工程材料及应用技术湖南省重点实验室,长沙410082

出　　处：《材料导报》2022年第9期89-97,共9页Materials Reports

基　　金：国家重点研发计划项目(2018YFC0705400);国家自然科学基金(U1806225,51638008)。

摘　　要：本工作研究了玻璃纤维织物增强海水海砂混凝土(GTR-SWSSC)复合材料于海水浸泡和干湿循环条件下的弯曲性能。在不同干湿循环次数和海水浸泡时间下对玻璃纤维增强混凝土(GTR-SWSSC)进行了四点弯曲试验,对复合材料在模拟海洋服役环境下的抗弯性能进行了评估。同时,探究了环氧树脂对复合材料抗海水腐蚀性能的改善作用,并通过电镜扫描从微观层面对海水浸泡时间、干湿循环次数和环氧树脂涂层的作用进行了分析。研究结果表明GTR-SWSSC的弯曲性能变化符合一定的规律,海水干湿循环和浸泡环境导致了试件内部结构的损伤,使得试件强度有所下降。总体而言,复合材料在海水恶劣环境下的强度呈现较为缓慢的下降趋势,采用环氧树脂进行表面处理能有效提高试件的弯曲强度,延缓试件力学性能的衰退,但是延缓效果在一定时间后随龄期延长逐渐减弱。In this work,the flexural behavior of glass fibertextile reinforced seawater sea-sand concrete(GTR-SWSSC)exposed to the simulated marine environment was studied.Four-point bending tests were carried out on GTR-SWSSC after different drying-wetting cycles and seawater immersion time,and the flexural performance of GTR-SWSSC was evaluated.At the same time,the improvement effect of epoxy resin on the resistance of GTR-SWSSC to seawater was investigated and analyzed from the microscopical level by scanning electron microscope(SEM).The results show that the bending properties of GTR-SWSSC conform to a certain regularity,and the exposure to seawater leads to the damage of the internal structure of the specimen,which makes the bending strength decrease.In general,the bending strength of the GTR-SWSSC exhibits a relatively slow decline trend in the harsh marine environment.Surface treatment with epoxy resin can effectively improve the bending strength and delay the decline of the mechanical properties of GTR-SWSSC,but the delaying effect is gradually weakened with the increase of the age after a certain period of time.

关 键 词：海水海砂混凝土 耐碱玻璃纤维 水下区 潮汐区 海水浸泡 干湿循环 弯曲性能 耐久性 

分 类 号：TU528[建筑科学—建筑技术科学]