寇佳亮^1,2，邓明科¹，梁兴文¹

（1 西安建筑科技大学土木工程学院，西安 710055；2 西安理工大学土木建筑工程学院, 西安 710048）

 

［摘要］选用5种不同的PVA纤维配制延性纤维增强混凝土，对其进行单轴拉伸性能试验，测得材料的立方体抗压强度、密度和拉伸应力-应变全曲线。通过试验对比分析发现，掺加不同PVA纤维的延性纤维增强混凝土的拉伸应力-应变曲线均具有一定的应变硬化特性；不同PVA纤维性能对初裂应力-应变、峰值应力-应变、极限拉应变和抗压强度都有明显的影响；同一种纤维配制的延性纤维增强混凝土随着水胶比增大，其立方体抗压强度均有明显降低，并且密度降低；水胶比对延性纤维增强混凝土的立方体抗压强度、应力-应变影响较大，在满足抗拉强度和韧性的前提下应采用较低的水胶比，这也有助于提高纤维的分散性，但同时较低的水胶比将使其和易性变差。

［关键词］延性纤维增强混凝土；聚乙烯醇纤维；单轴拉伸性能；应力-应变曲线；应变硬化

中图分类号：TU528.58        文献标识码：A        文章编号：1002-848X(2013)01-0059-06

 

Kou Jialiang^1,2, Deng Mingke¹, Liang Xingwen¹

(1 School of Civil Engineering, Xi′an University of Architecture and Technology, Xi′an 710055, China; 2 School of Civil Engineering & Architecture, Xi′an University of Technology, Xi′an 710048, China)

 

Abstract: The uniaxial tensile properties of ductile fiber reinforced concrete compounded with 5 various PVA fibers were tested. The cube compressive strength,density and the uniaxial tensile complete stress-strain curve were obtained. Tests of uniaxial tensile properties show that the curves of partial ductile fiber reinforced concrete have strainhardening properties. Various PVA fibers properties have significant influence on initial cracking stress-strain, peak stress-strain, ultimate tensile strain and cube compressive strength. When the water-cement ratio of ductile fiber reinforced concrete with the same fiber increases, the cube compressive strength and density decrease. The water-cement ratio of ductile fiber reinforced concrete also has great effect on the stress-strain and cube compressive strength. The lower water-cement ratio, if the good tensile strength and toughness can be met, can help to improve the dispersion of fibers, and make it worse workability.

Keywords: ductile fiber reinforced concrete; PVA fiber; uniaxial tensile property; stress-strain curve; strain-hardening

* 国家自然科学基金资助项目(50908187,51078305)，陕西省重点学科建设专项资金资助项目(E01001，E01003)，陕西省自然科学青年基金资助项目（2009JQ7013），西安建筑科技大学基础研究基金资助项目（JC0902）, 长江学者和创新团队发展计划资助项目，西安理工大学博士启动资金（118\|211206)。

作者简介：寇佳亮，博士，讲师，Email：jialiangkou0918@163.com

 

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