纤维表面改性对EGC力学性能的影响  

Effect of Fiber Surface Modification on Mechanical Properties of EGC

作　　者：陈娅 万小梅[1,2] 崔允铮 李辉 CHEN Ya;WAN Xiaomei;CUI Yunzheng;LI Hui(School of Civil Engineering,Qingdao University of Technology,Qingdao 266520,China;Collaborative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone,Qingdao University of Technology,Qingdao 266520,China)

机构地区：[1]青岛理工大学土木工程学院,青岛266520 [2]青岛理工大学蓝色经济区工程建设与安全山东省协同创新中心,青岛266520

出　　处：《硅酸盐通报》2023年第4期1174-1182,1193,共10页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(51878365)。

摘　　要：采用化学沉积法将合成的纳米SiO_(2)附着在聚乙烯醇(PVA)纤维和聚乙烯(PE)纤维表面,使用扫描电子显微镜(SEM)观测改性后纤维表面SiO_(2)的分布情况。通过抗压、抗折测试和单轴拉伸测试对比纤维表面改性前后工程地质聚合物复合材料(EGC)的强度和韧性,并通过单纤维拔出试验从细观力学角度验证宏观力学性能改变的原因。研究发现,经SiO_(2)疏水改性后的PVA纤维EGC试件抗压、抗折强度有所下降,经SiO_(2)亲水改性后的PE纤维EGC试件抗压、抗折强度得到提升。在单轴拉伸过程中,绝大多数EGC试件都表现出不同程度的拉伸应变硬化特性,且纤维经改性后这一特征更加明显。单纤维拔出试验结果显示,纤维表面改性EGC试件有更为明显的滑移硬化阶段,纤维-基体界面性能得到了改善。The synthesized nano-SiO_(2) was attached to the surface of polyvinyl alcohol(PVA)fiber and polyethylene(PE)fiber by chemical deposition method,and the distribution of SiO_(2) on the modified fiber surface was observed by scanning electron microscope(SEM).The strength and toughness of engineering geopolymer composites(EGC)were compared by compressive tests,flexural tests and uniaxial tensile tests before and after the surface modification of fibers.And the reason for the change of macro-mechanical properties was verified by single fiber pull-out tests from the microscopic mechanical point of view.The results show that the compressive and flexural strength of PVA fiber EGC specimen after hydrophobic modification of SiO_(2) decrease and those properties of PE fiber EGC specimen after hydrophilic modification of SiO_(2) improve.In the process of uniaxial tension,most EGC specimens show different degrees of tensile strain hardening,and it is more obvious after the fibers are modified.The results of single fiber pull-out tests show that the EGC specimens have a more obvious slip hardening stage and the interface property of fiber-matrix is improved after fiber surface modification.

关 键 词：地质聚合物 纤维 二氧化硅 力学性能 韧性 界面性能 

分 类 号：TU528.58[建筑科学—建筑技术科学]