土木与环境工程学报（中英文）2024，Vol.46Issue(4)：159-166,8.DOI:10.11835/j.issn.2096-6717.2022.044
结构型钢纤维对盐-冻融耦合作用下混凝土损伤的影响
Effect of macro steel fiber on damage of concrete after salt freeze-thaw cycle
摘要
Abstract
In order to reveal the influence of salt erosion and freeze-thaw cycle coupling effect of steel fiber on concrete damage evolution,four groups of concrete specimens with different mass fractions of steel fiber were tested under salt freeze-thaw test.The damage of concrete after salt freeze-thaw cycles was analyzed by ultrasonic method and laser scanning method.The damage degree D of concrete after salt freeze-thaw cycles was obtained by analyzing the change of ultrasonic wave velocity.The Weibull distribution model between D and freeze-thaw cycles n was established.The surface roughness was used to characterize the surface damage of the concrete.The change rate of roughness ΔR of concrete with different steel fiber dosage was studied as a function of freeze-thaw cycles.The results indicate that the damage of concrete decreases with the increase of steel fiber dosage.The relationship between D and n established by ultrasonic method satisfied the two-parameter Weibull distribution model,and the determination coefficient is higher than 0.95.It has an exponential relationship between D and ΔR due to its determination coefficient higher than 0.80.关键词
钢纤维/盐-冻融循环/混凝土损伤/超声波法/损伤度/粗糙度Key words
steel fiber/salt freeze-thaw cycle/concrete damage/ultrasonic test/damage degree/roughness分类
建筑与水利引用本文复制引用
丁一宁,葛茂林,刘倩文,朱昊..结构型钢纤维对盐-冻融耦合作用下混凝土损伤的影响[J].土木与环境工程学报（中英文）,2024,46(4):159-166,8.基金项目
国家自然科学基金(51578109) （51578109）
大连市科技创新基金(2020JJ27SN108) National Natural Science Foundation of China(No.51578109) （2020JJ27SN108）
Science and Technology Innovation Foundation of Dalian(No.2020JJ27SN108) （No.2020JJ27SN108）
