温缩纤维混凝土力学性能试验与本构关系
Mechanical Properties Test and Constitutive Relationship of Heat-shrinkable Fiber-reinforced Concrete
卢志芳 1胡玉坤 1吴静 2刘沐宇 1张利华3
作者信息
- 1. 武汉理工大学土木工程与建筑学院,武汉 430070;武汉理工大学道路桥梁与结构工程湖北省重点实验室,武汉 430070
- 2. 武汉纺织大学材料科学与工程学院,武汉 430200
- 3. 武汉市政工程设计研究院有限责任公司,武汉 430023
- 折叠
摘要
为提高混凝土的抗裂性能,研发了一种基于温缩纤维的混凝土材料,利用温升时纤维回缩所产生的应力来提高混凝土的抗裂性能.为了探明该种混凝土的力学性能,设计制作了 26组共计112个混凝土试块,按2.0 kg/m3纤维掺量,通过试块蒸养模拟温升作用,对比分析了素混凝土、聚丙烯纤维混凝土、温缩纤维混凝土的力学性能,研究了温缩纤维混凝土的应力-应变曲线.结果表明,温缩纤维混凝土的力学性能优于聚丙烯纤维混凝土和素混凝土,轴心抗拉强度分别提高了 30.17％和31.96％,说明温缩纤维对混凝土的抗裂性能有明显的提高作用.同时建立了温缩纤维混凝土的本构关系,为温缩纤维混凝土的应用提供了理论和试验依据.
Abstract
In order to improve the crack resistance of concrete,the research group developed a concrete material based on heat-shrinkable fiber,which improved the cracking resistance of concrete by using the stress generated by fiber shrink-age during temperature rise.In order to explore the mechanical properties of this kind of concrete,26 groups of 112 con-crete test blocks were designed and prepared,and the stress-strain curve of heat-shrinkable fiber-reinforced concrete(HFC)was compared and analyzed by simulating the temperature rise by the steam curing of the test block according to the fiber content of 2.0 kg/m3.The results show that the mechanical properties of HFC are better than those of polypro-pylene fiber-reinforced concrete and plain concrete,and the axial tensile strength is increased by 30.17％and 31.96％,re-spectively,indicating that heat-shrinkable fiber has a significant effect on the crack resistance of concrete.At the same time,the constitutive relationship of HFC is established,and the research work provides a theoretical and experimental ba-sis for the application of HFC.
关键词
温缩纤维混凝土/纤维回缩/力学性能/应力-应变曲线/本构关系Key words
heat-shrinkable fiber-reinforced concrete/fiber shrinkage/mechanical properties/stress-strain curve/constitutive relationship引用本文复制引用
基金项目
湖北省重点研发计划(2020BAB081)
出版年
2024
NETL
NSTL
万方数据