玄武岩纤维特征参数对混凝土单轴受拉性能的影响  

Influence of basalt fiber characteristic parameters on uniaxial tensile properties of concrete

作　　者：郭耀东[1] 刘元珍[1] 王文婧 张玉[1] 王凯迪 刘运房 GUO Yaodong;LIU Yuanzhen;WANG Wenjing;ZHANG Yu;WANG Kaidi;LIU Yunfang(College of Civil Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Facult of Engineering,China University of Geosciences,Wuhan 430079,China)

机构地区：[1]太原理工大学土木工程学院,太原030024 [2]中国地质大学工程学院,武汉430079

出　　处：《复合材料学报》2023年第5期2897-2912,共16页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(52078473,51808375,5201101735);Russian Foundation for Basic Research(21-51-53008);住建部科学技术计划项目(2021-K-046);山西省新兴产业领军人才项目(202014)。

摘　　要：考虑玄武岩纤维体积分数和长径比两个主要因素,通过直接拉伸试验,研究玄武岩纤维对混凝土轴心受拉破坏形态、应力-应变全曲线、受拉荷载变形性能和韧性的影响。结果表明:玄武岩纤维增强混凝土单轴受拉破坏呈明显的塑性特征,玄武岩纤维显著增强了混凝土在轴心受拉荷载作用下的韧性;与普通混凝土(NC)相比,随着玄武岩纤维增强因子的提高,轴心受拉应力-应变全曲线特征点和断裂能均呈先增大后减小的趋势;基于轴心受拉应力-应变全曲线分析,提出关于纤维体积分数和长径比的玄武岩纤维混凝土轴心受拉应力-应变本构模型,可供玄武岩纤维混凝土结构和构件的非线性分析和工程设计参考。对比分析拉压比、折压比和单轴拉伸破坏断裂能3种韧性指标,发现断裂能可以准确评价玄武岩纤维增强混凝土(BFRC)受拉韧性,BFRC韧性较NC最大提升率为43.0%。Considering the two main factors of basalt fiber volume fraction and aspect ratio,the axial tensile failure mode,full stress-strain curve,tensile load deformation performance and toughness of basalt fiber concrete reinforced were studied through direct tensile test.The results show that the uniaxial tensile failure of basalt fiber reinforced concrete shows obvious plastic characteristics,and basalt fiber significantly enhances the toughness of concrete under axial tensile load.Compared with ordinary concrete,with the increase of basalt fiber reinforcement factor,the characteristic points and fracture energy of the full axial tensile stress-strain curve increase first and then decrease.Based on the full axial tensile stress-strain curve analysis,the axial tensile stress-strain constitutive model of basalt fiber reinforced concrete about fiber volume fraction and length diameter ratio was proposed,which can be used as a reference for nonlinear analysis and engineering design of basalt fiber reinforced concrete structures and components.The tensile compression ratio,flexural compression ratio and uniaxial tensile failure fracture energy were compared and analyzed.It is found that fracture energy can accurately evaluate the tensile toughness of basalt fiber reinforced concrete(BFRC),and the maximum increase rate of BFRC toughness compared with normal concrete(NC)is 43.0%.

关 键 词：玄武岩纤维增强混凝土 纤维增强因子 应力-应变全曲线 本构模型 韧性 

分 类 号：TB301[一般工业技术—材料科学与工程]