盐-冻融循环耦合作用下混杂纤维混凝土盐冻损伤模型
Salt-frost damage model of hybrid fiber reinforced concrete under the coupling action of salt-freeze-thaw cycles
夏冬桃 1冯晨潞 1郑挚 1吴昊2
作者信息
- 1. 湖北工业大学土木建筑与环境学院,湖北武汉 430068
- 2. 长江航务管理局机关事务中心,湖北武汉 430014
- 折叠
摘要
为研究混杂纤维混凝土抗盐冻性能,对5组在硫酸盐-氯盐溶液中冻融循环后的混杂纤维混凝土进行了力学性能试验,对比分析了混杂纤维混凝土在不同盐冻循环次数后的抗压、劈拉破坏形态、强度损失率及盐冻损伤.试验结果表明:在0～200次盐冻循环期间,钢-聚丙烯混杂纤维混凝土抗盐冻性能最佳,单掺纤维混凝土中1.2％钢纤维掺量抗盐冻性能略优于0.8％钢纤维掺量.以Weibull分布理论建立了纤维混凝土盐冻损伤模型,根据冻融条件下混凝土强度衰减模型建立了改进的盐冻循环作用下纤维混凝土的强度衰减模型.联立强度衰减模型与盐冻损伤模型,建立混杂纤维混凝土盐冻损伤度演化方程,可通过盐冻循环次数和相对强度来预测纤维混凝土的盐冻损伤.
Abstract
In order to study the salt-freezing resistance of hybrid fiber reinforced concrete,the mechanical properties of five groups of hybrid fiber reinforced concrete after freezing and thawing cycle in sulfate-chloride salt solution were tested,and the compressive strength,splitting-tensile failure forms,strength loss rate and salt-freezing damage of hybrid fiber reinforced concrete after different salt-freezing cycles were compared and analyzed.The test results show that the steel-polypropylene hybrid fiber reinforced concrete has the best salt-frost resistance during 0-200 salt-freezing cycles.In the single fiber concrete,the salt-freezing resistance of 1.2％steel fiber concrete is slightly better than that of 0.8％steel fiber concrete.The Weibull distribution theory is used to establish the salt-freeze damage model of hybrid fiber reinforced concrete.Based on the strength attenuation model of concrete under the condition of freeze-thaw cycle,an improved strength attenuation model of fiber reinforced concrete under the effect of salt-freezing cycles is established.By combining the strength attenuation model and salt-freezing damage model,the evolution equation of salt-freezing damage degree of hybrid fiber concrete is established.The salt-freezing damage degree of hybrid fiber reinforced concrete can be predicted by the number of salt-freezing cycles and relative strength.
关键词
纤维混凝土/盐冻循环/强度衰减模型/盐冻损伤模型Key words
fiber reinforced concrete/salt-freezing cycle/strength attenuation model/salt-freezing damage model引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据