海水海砂混凝土中混杂碳-玄武岩纤维筋拉伸性能退化机制及寿命预测  

Degradation mechanism of tensile properties and life prediction of hybrid carbon/basalt fiber reinforced polymer bars in seawater sea-sand concrete

作　　者：许艾沿 杜运兴[1] 潘柳景泰 朱德举[1,3] XU Aiyan;DU Yunxing;PAN Liujingtai;ZHU Deju(School of Civil Engineering,Hunan University,Changsha 410082,China;School of Civil Engineering,Central South University,Changsha 410083,China;Key Laboratory for Green&Advanced Civil Engineering Materials and Application Technology of Hunan Province,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学土木工程学院,长沙410082 [2]中南大学土木工程学院,长沙410083 [3]湖南大学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：《复合材料学报》2024年第7期3677-3688,共12页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金山东联合基金项目(U1806225)。

摘　　要：为了研究海水浸泡下海水海砂混凝土(SSC)中以环氧树脂为基体的混杂碳-玄武岩纤维复材筋(CFBF/Epoxy)拉伸性能退化规律,在不同温度(25℃、40℃和55℃)下对SSC中的CF-BF/Epoxy进行海水浸泡,周期为60天、90天和120天,通过拉伸试验对CF-BF/Epoxy在SSC中的拉伸性能进行了研究,并利用SEM和FTIR对其微观结构的变化进行了分析。结果显示:环境温度对CF-BF/Epoxy的拉伸性能有明显影响,在55℃下浸泡120天后,抗拉强度下降了13.84%,弹性模量在3%范围内轻微波动,CF-BF/Epoxy出现伪延性;玄武岩纤维和碳纤维混杂延缓了SSC中OH-进一步向CF-BF/Epoxy内部侵蚀,而外层玄武岩纤维区域的树脂水解和树脂-纤维界面退化是CF-BF/Epoxy拉伸性能退化的主要原因。最后基于Arrhenius方程预测,嵌入SSC中的CF-BF/Epoxy的抗拉强度保持率将在584~803天内降至70%。To investigate the degradation pattern of tensile properties of epoxy resin-based hybrid carbon-basalt fiber reinforcing bars(CF-BF/Epoxy)in seawater sea-sand concrete(SSC)under seawater immersion,the CFBF/Epoxy in SSC were soaked in seawater at different temperatures(25℃,40℃,and 55℃)for durations of 60,90 and 120 days.The tensile performance of the CF-BF/Epoxy in SSC was examined through tensile tests,and the changes in their microstructure were analyzed by SEM and FTIR.The results indicate that ambient temperature significantly affects the tensile properties of CF-BF/Epoxy.After 120 days of immersion at 55℃,the tensile strength decreases by 13.84%,the elastic modulus experiences a slight fluctuation within a 3% range,and pseudo-ductility is observed in the CF-BF/Epoxy.Additionally,blending of basalt fibers and carbon fibers delay the further intrusion of OH-from SSC into CF-BF/Epoxy,while the hydrolysis of the resin in the outer basalt fiber region and the degradation of the resin-fiber interface are identified as the primary causes of the decline in the tensile properties of CF-BF/Epoxy.Lastly,based on the Arrhenius equation,it is predicted that the tensile strength retention rate of CF-BF/Epoxy embedded in SSC will drop to 70% between 584 and 803 days.

关 键 词：混杂碳-玄武岩纤维复材筋 海水海砂混凝土 抗拉强度 退化机制 寿命预测 

分 类 号：TB332[一般工业技术—材料科学与工程]