氯盐侵蚀作用下BFRP筋增强海砂ECC的拉伸及弯曲性能试验  

Experimental study on tensile and bending properties of sea sand ECC reinforced by BFRP bars under chloride salt erosion

作　　者：姚淇耀 陆宸宇 彭林欣[1,2] 滕晓丹 罗月静 YAO Qiyao;LU Chenyu;PENG Linxin;TENG Xiaodan;LUO Yuejing(School of Civil Engineering and Architecture,Guangxi University,Guangxi 530004,China;Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,Guangxi Key Laboratory of Disaster Prevention and Engineering Safety,Guangxi University,Guangxi 530004,China;Guangxi Xinfazhan Communications Group Co.Ltd.,Guangxi 530028,China;Hualan Design&Consulting Group,Guangxi 530011,China;Guangxi Transportation Science&Technology Group Co.Ltd.,Guangxi 530007,China)

机构地区：[1]广西大学土木建筑工程学院,广西530004 [2]广西大学广西防灾减灾与工程安全重点实验室工程防灾与结构安全教育部重点实验室,广西530004 [3]广西新发展交通集团有限公司,南宁530028 [4]华蓝设计(集团)有限公司,广西530011 [5]广西交科集团有限公司,广西530007

出　　处：《复合材料学报》2022年第3期1215-1227,共13页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(51738004,51878186,11962001);国家重点研发计划(2019YFC1511103);中国博士后科学基金(2018M633298);广西创新驱动重大专项(桂科AA18118055);广西研究生教育创新计划(YCSW2019048)。

摘　　要：为推广使用海洋资源,采用海砂代替硅砂制备工程水泥基复合材料(Engineering cementitious composites,ECC)。将海砂ECC与玄武岩纤维增强树脂复合材料(Basalt fiber reinforced polymer,BFRP)筋结合,充分发挥两种材料的优点,以获得更强的耐腐蚀性能及更为优异的拉伸性能。通过单轴拉伸及四点弯曲试验,研究了不同侵蚀制度及配筋率对BFRP筋增强海砂ECC的拉伸性能及弯曲性能的影响,并与未配筋的海砂ECC作比较。结果表明,BFRP筋增强海砂ECC的极限拉应力与海砂ECC相比提升了2.46~4.92倍,极限拉应变提升了1.40~2.94倍,干湿循环作用下BFRP筋增强海砂ECC的极限荷载是海砂ECC极限荷载的3.14~4.29倍。不同侵蚀制度下,BFRP筋增强海砂ECC的最佳配筋率均为0.67%。研究的BFRP筋增强海砂ECC可为桥面无缝连接板等设计提供参考。In order to popularize the use of marine resources,sea sand was used to prepare engineering cementitious composite(ECC)instead of silica sand.By combining sea sand ECC with basalt fiber reinforced polymer(BFRP)bars,the advantages of the two kinds of materials can be fully exploited to obtain higher corrosion resistance and better tensile properties.Through uniaxial tensile and four-point bending tests,the effects of different erosion systems and reinforcement ratio on the tensile and bending properties of BFRP reinforced sea sand ECC were studied,and compared with the sea sand ECC without BFRP reinforcement.The results show that the ultimate tensile stress of BFRP reinforced sea sand ECC is increased by 2.46-4.92 times and the ultimate tensile strain is increased by 1.40-2.94 times compared with the sea sand ECC.The ultimate load of BFRP reinforced sea sand ECC is 3.14-4.29 times of the sea sand ECC without BFRP reinforcement under the effect of dry-wetting cycling.Under different erosion systems,the optimal reinforcement ratio of BFRP reinforced sea sand ECC is 0.67%.The BFRP reinforced sea sand ECC can provide reference for the design of seamless bridge deck.

关 键 词：Friedel盐 受弯性能 拉伸性能 BFRP筋 海砂 氯盐侵蚀 

分 类 号：TU528.58[建筑科学—建筑技术科学]