中高温及低温作用后超高韧性水泥基复合材料的力学性能
Study on mechanical properties of ultra-high toughness cementitious composites after medium-high temperature and low temperature
钱维民 1苏骏 2史庆轩 3李扬 2嵇威2
作者信息
- 1. 西安建筑科技大学 土木工程学院,西安 710055;湖北工业大学 土木建筑与环境学院,武汉 430068
- 2. 湖北工业大学 土木建筑与环境学院,武汉 430068
- 3. 西安建筑科技大学 土木工程学院,西安 710055
- 折叠
摘要
为研究超高韧性水泥基复合材料(UHTCC)在 200～-100℃温度作用后的力学性能,设计了不同纤维体积掺量的UHTCC,经中高温和低温作用后进行基本力学性能试验,通过UHTCC强度和变形等参数评价了中高温和低温作用后UHTCC的力学性能.结果表明:纤维的掺入能有效改善基体的脆性,提升材料的韧性;同时温度作用导致材料内部出现初始缺陷,对UHTCC的力学性能有明显的影响,且低温作用的影响要明显高于高温作用,当温度降低至-100℃时,UHTCC强度最大降低约 75%,变形最大降低约 92%,但温度作用未对UHTCC的泊松比产生明显影响.在此基础上提出了中高温及低温作用后UHTCC轴压和轴拉应力-应变关系回归模型,为UHTCC材料在极端温度环境下的性能设计和工程应用提供参考.
Abstract
In order to study the mechanical properties of ultra-high toughness cementitious composites(UHTCC)after temperatures of 200--100℃,UHTCC with different fiber volume content was designed.The basic mechani-cal properties of UHTCC after medium-high temperatures and cryogenic temperatures were tested,and the mech-anical properties of UHTCC after medium-high temperatures and cryogenic temperatures were evaluated by para-meters such as strength and deformation of UHTCC.The results show that the incorporation of fibers can effec-tively improve the brittleness of the material and enhance the toughness of the material.The temperature effect makes the initial defects appear inside the material,which has a significant effect on the mechanical properties of UHTCC,and the effect of low temperature is significantly higher than that of high temperature.When the tempera-ture is reduced to-100℃,the strength of UHTCC is reduced by about 71%at most,and the deformation is reduced by about 92%at most,but the temperature has no significant effect on the Poisson's ratio of UHTCC.On this basis,the regression model of axial compression and axial tensile stress-strain relationship of UHTCC after medium-high temperatures and cryogenic temperatures is proposed,which provides a reference for the performance design and engineering application of UHTCC materials at extreme temperatures.
关键词
超高韧性水泥基复合材料/中高温/低温/力学性能/本构模型Key words
ultra-high toughness cementitious composites/medium-high temperatures/cryogenic temperatures/mechanical properties/constitutive model引用本文复制引用
基金项目
国家自然科学基金(52178505)
国家自然科学基金(51878540)
湖北省自然科学基金(2020CFB860)
出版年
2024
NETL
NSTL
万方数据