混杂纤维对NC的力学性能影响研究  

Effect of Hybrid Fiber on Mechanical Properties of NC

作　　者：徐晋 樊广利 张明明[1] 王社良[1,2] XU Jin;FAN Guang-lil;ZHANG Ming-ming;WANG She-liang(School of Civil Engineering,Xijing University,Xi＇an 710123,China;School of Civil Engineering,Xi＇ an University of Architecture and Technology,X i ’ an 710055,China)

机构地区：[1]西京学院土木工程学院,西安710123 [2]西安建筑科技大学土木工程学院,西安710055

出　　处：《硅酸盐通报》2018年第5期1525-1530,1537,共7页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(51178388);陕西省教育厅重点实验室科研计划项目(11JS059;12JS055);陕西省攻关项目(2014K06-34)

摘　　要：纤维因其具有变形小、韧性大以及强度高等优点在混凝土中被广泛应用,但是由于不同种类的纤维性能和尺寸不相同,从而导致其普通混凝土力学性能的差异,因此通过对单一纤维、二元混杂纤维、三元混杂纤维混凝土的立方体抗压强度、轴心抗压强度、劈裂抗拉强度、抗折强度、变形性能进行试验研究,从而总结纤维混凝土的增强规律。研究结果表明:添加不同种类纤维后,纤维的抗拉阻裂作用使得混凝土避免了脆性破坏形态,具有延性破坏的特征;对抗折强度的增强最为敏感,其抗折强度均高于普通混凝土,且混杂纤维较单一纤维混凝土增幅更为明显,最大增幅达普通混凝土相应强度的1.3倍;对于峰值应力、峰值应变、弹性模量,纤维混凝土基本均低于普通混凝土;其中纤维混凝土的切线模量随着应力的增加而逐渐降低。Fiber has been widely used in concrete because of its small deformation,high ductility and high strength,but due to the fiber performance and size of different types are not the same,which leads to the difference of mechanical properties on ordinary concrete,therefore,the cube compressive strength,axial compressive strength,splitting tensile strength,flexural strength and deformation performance of single fiber,two yuan hybrid fiber and three yuan hybrid fiber reinforced concrete were studied,the strengthening rule of fiber reinforced concrete was summarized. The results show that the addition of different types of fibers,the tensile resistance of fiber concrete crack makes avoid brittle failure form and has the characteristics of ductile fracture; the flexural strength is most sensitive to fibers and is higher than that of ordinary concrete,the hybrid fiber is more obvious than the single fiber reinforced concrete,and the maximum increase is 1. 3 times of the corresponding strength of ordinary concrete; for the peak stress,the peak strain and the modulus of elasticity,the fiber concrete is basically lower than that of the ordinary concrete; the tangent modulus of fiber reinforced concrete gradually decreases with the increase of stress.

关 键 词：再生纤维 劈裂抗拉 弹性模量 强度比 

分 类 号：TU528.041[建筑科学—建筑技术科学]