摘要
为了研究侵蚀环境下玻璃纤维增强复合材料(GFRP)筋的力学性能退化机理,对3种不同直径的GFRP筋进行了为期半年的溶液浸泡试验。试验采用了清水、碱溶液以及盐溶液3种侵蚀环境,在浸泡不同时间后分别对筋材进行了外观检测和力学性能试验。结果表明:不同侵蚀环境下,GFRP筋的抗拉强度在碱环境中下降最多,平均为11.44%,其次是盐环境,平均为4.59%,下降最少是清水环境,平均为4.30%;GFRP筋的剪切强度在清水、盐、碱环境中分别平均下降了23.03%,18.69%,28.28%,说明侵蚀环境对其力学性能有明显的影响;在盐环境下,直径为8,12,16mm的试样抗拉强度分别下降了3.53%,9.42%,0.82%,说明GFRP筋力学性能退化具有一定的尺寸效应;GFRP筋的剪切强度退化随浸泡时间的增加而增大,在前36d下降较快,36d后下降则趋于平缓。
In order to study the mechanical properties degradation mechanism of glass fiber reinforced polymer (GFRP)bars under eroded environment,three kinds of GFRP bars with different diameters were tested in solution immersion for six months.In the experiment,three kinds of eroded environments,such as clear water,alkali solution and salt solution,were used to test the appearance and mechanical properties of the reinforcement materials after soaking different time.The results show that in different eroded environment,the tensile strength of GFRP bars decreases mostly in alkaline environment,the average is 11.44%,in the salt environment,the average is 4.59%,in the water environment,the average is 4.30%,and theshear strenghs decrease 23.03%,18.69%,28.28% in water,salt and alkali environments respectively,which indicates that the eroded environment has a significant effect on mechanical properties,in the salt environment,the tensile strengths of 8,12and 16mm specimens decrease by 3.53%,9.42% and 0.82%respectively,which indicates that the mechanical properties of the samples have a certain size effect.The shear strength degradations of GFRP bars increase with the increase of immersion time,and decrease rapidly in previous 36d and slowly after 36d.
作者
陆春华
何礼远
褚天舒
延永东
LU Chun-hua;HE Li-yuan;CHU Tian-shu;YAN Yong-dong(Faculty of Civil Engineering and Mechanics,Jiangsu University,Zhenjiang 212013,Jiangsu,China)
出处
《建筑科学与工程学报》
CAS
北大核心
2018年第6期73-79,共7页
Journal of Architecture and Civil Engineering
基金
国家自然科学基金项目(51578267
51378241
51608233)
江苏省"六大人才高峰"高层次人才资助项目(2015-JZ-008)
