铁道科学与工程学报2025，Vol.22Issue(3)：1344-1356,13.DOI:10.19713/j.cnki.43-1423/u.T20240821
硫酸盐侵蚀纤维混凝土损伤劣化及可靠性分析
Damage deterioration and reliability analysis of sulfate attack fiber reinforced concrete
摘要
Abstract
In order to investigate the sulfate corrosion resistance of basalt fiber-reinforced concrete(BFRC)in the saline soil region of Northwest China,sulfate accelerated erosion tests were designed to simulate the local climatic environment and the sulfate ion content in the saline soil.Under the combined of sulfate attack and wetting-drying cycles,the mass loss rate,relative dynamic elastic modulus and appearance of BFRC with basalt fiber(BF)volume content of 0.0%,0.1%,0.2%and 0.3%were investigated.The reliability analysis of BFRC under sulfate erosion-dry-wet coupling was carried out by Wiener process with mass loss rate and relative dynamic elastic modulus as evaluation indexes.The results show that the addition of BF can effectively improve the sulfate resistance of concrete.Compared with the reference group without BF,the mass loss rates of BFRC-1,BFRC-2 and BFRC-3 with 0.1%,0.2%,0.3%of BF is reduced by 6.48%,16.73%,23.58%,respectively.The relative dynamic elastic modulus can increase by 10.48%,17.04%,21.14%.Meanwhile,the integrity of BFRC-3 specimen is better at the end of sulfate erosion-dry-wet coupling test,only the surface pores became numerous and more large,crisscrossed cracks appeared,and only a small amount of mortar layer peeling off at the corners and edges,which meaning the best performance of BFRC with BF doping of 0.3%in terms of sulfate erosion resistance.Furthermore,BF inhibited and hindered the generation and further expansion of cracks,which is caused by the expansion of gypsum and ettringite.Therefore,it can improve the sulfuric acid corrosion resistance of concrete.The Wiener process can effectively describe the durability degradation law of BFRC under sulfate attack,as a durability evaluation index,the relative dynamic elastic modulus is more sensitive and accurate than the mass loss rate.The application of BFRC has a good prospect in the Northwest saline soil area.The research results can provide a theoretical basis for the reliability analysis of BFRC.关键词
玄武岩纤维混凝土/硫酸盐侵蚀/干湿循环/Wiener随机过程/可靠性分析Key words
basalt fibers reinforced concrete/sulfate erosion/dry-wet cycle/Wiener stochastic process/reliability analysis分类
建筑与水利引用本文复制引用
朱飞飞,乔宏霞,付勇,王新科..硫酸盐侵蚀纤维混凝土损伤劣化及可靠性分析[J].铁道科学与工程学报,2025,22(3):1344-1356,13.基金项目
国家自然科学基金资助项目(U21A20150,52178216) （U21A20150,52178216）
青海省基础研究计划资助项目(2022-ZJ-921) （2022-ZJ-921）
