湖南大学学报（自然科学版）2024，Vol.51Issue(11)：138-146,9.DOI:10.16339/j.cnki.hdxbzkb.2024115
复掺偏高岭土和硅灰对混凝土耐盐酸影响
Effect of Concrete Binary Mixed with Metakaolin and Silica Fume on Hydrochloric Acid Resistance
摘要
Abstract
To explore the effect of concrete binary mixed metakaolin and silica fume on the resistance of hydrochloric acid,the specimens were prepared according to 5%metakaolin and 5%,10%or 15%silica fume by weight of total cementitious materials,and the immersion test of hydrochloric acid was carried out.The effects of corrosion on the thickness of the damage layer,pore structure and hydration products of concrete were investigated by ultrasonic,mercury intrusion porosity(MIP),X-ray diffraction(XRD),thermogravimetric analysis(TGA)and scanning electron microscopy(SEM).Moreover,the relationship between the thickness of the damage layer and the pore structure is compared and analyzed.The results show that M5S5 has the best acid resistance based on compressive strength,splitting tensile strength and flexural strength.The thickness of the damage layer is negatively correlated with ultrasonic velocity,and positively correlated with porosity,average pore size and total pore area.The combination of metakaolin and silica fume can improve the acid resistance of concrete.However,the increasing content of silica fume slightly reduces the improvement effect.关键词
混凝土/复掺/超声波/孔隙结构/损伤层Key words
concrete/binary mix/ultrasonic/pore structure/damage layer分类
建筑与水利引用本文复制引用
贺盛,覃宇,覃当麟,于鹏..复掺偏高岭土和硅灰对混凝土耐盐酸影响[J].湖南大学学报（自然科学版）,2024,51(11):138-146,9.基金项目
广西重点研发计划项目(AB24010079,AB24010002),Guangxi Key Research and Development Program(AB24010079,AB24010002) （AB24010079,AB24010002）
广西自然科学基金资助项目(2024GXNSFAA010206),General Program of Natural Science Foundation of Guangxi Province(2024GXNSFA A010206) （2024GXNSFAA010206）
广西大学自然科学与技术创新发展倍增计划项目(2023BZRC020),Natural Science and Technology Innovation Development Multiplication Program of Guangxi University(2023BZRC020) （2023BZRC020）
广西高校引进海外高层次人才"百人计划",Research Grant for 100 Talents of Guangxi Plan （）
