摘要
为探究不同浓度碱与盐溶液对废弃陶瓷混凝土(以机制陶瓷砂替代混凝土细集料)耐腐蚀性的影响,制备了陶瓷替代率为0%、25%、50%、75%、100%的5组混凝土试块,分别浸泡于5%和10%浓度的Na2SO4、NaCl、NaOH溶液中,浸泡天数均为28 d。通过抗压强度试验分析其强度变化规律,并采用扫描电子显微镜(SEM)观察试块破坏后的微观结构。结果表明,废弃陶瓷混凝土在不同溶液浸泡后,其强度均随陶瓷替代率的增加呈现先增后降的变化规律,替代率为50%的试块耐腐蚀性性能最佳,其抗压强度最高可达37.52 MPa;替代率为100%时,强度显著下降,其抗压强度最低可达28.06 MPa。3种溶液中,Na2SO4溶液对废弃陶瓷混凝土的侵蚀与结构,损伤最为突出,致使浸泡后混凝土的强度降幅最为显著。微观结构分析表明,替代率为50%的废弃陶瓷混凝土结构3种溶液浸泡后均受到一定程度的损伤,Na2SO4溶液使其产生大量蛛网裂隙,损伤最为严重。
To investigate the effects of alkali,and salt solutions with different concentrations on the corrosion resistance of waste ceramic concrete(using mechanical ceramic sand to replace fine aggregate in concrete),five groups of concrete specimens with ceramic replacement rates of 0%,25%,50%,75%,and 100%were prepared,immersed in 5%and 10%concentrations of Na2 SO4,NaCl,and NaOH solutions respectively for 28 days;the strength change law was analyzed through compressive strength tests,and the microstructure of the damaged specimens was observed by a scanning electron microscope(SEM).The results show that after immersion in different solutions,the strength of waste ceramic concrete first increases and then decreases with the increase of ceramic replacement rate:the specimens with a 50%replacement rate exhibit the best corrosion resistance,with a maximum compressive strength of 37.52 MPa,while when the replacement rate reaches 100%,the strength decreases significantly,with a minimum compressive strength of 28.06 MPa;among the three solutions,the Na2SO4 solution causes the most prominent erosion and structural damage to waste ceramic concrete,resulting in the most significant strength reduction of the concrete after immersion.Microstructural analysis indicates that the structure of waste ceramic concrete with a 50%replacement rate suffers a certain degree of damage after immersion in the three solutions,and the Na2SO4 solution induces a large number of cobweb-like cracks,leading to the most severe damage.
作者
赵自祺
牛雷
汤宇杰
孙迪
关明
伊海赫
董建平
ZHAO Ziqi;NIU Lei;TANG Yujie;SUN Di;GUAN Ming;YI Haihe;DONG Jianping(School of Civil Engineering,Jilin Jianzhu University,Changchun 130118,China;China Construction Fifth Engineering Bureau Co.,Ltd.,Changsha 410021;School of Civil Engineering and Geomatics,Shandong University of Technology,Zibo 255000,Shandong Province,China;The Qingdao Engineer Co.,Ltd of China Railway No.10 Engineeing Group Co.,Ltd.,Qingdao 266000,Shandong Province,China)
出处
《吉林建筑大学学报》
2025年第6期71-78,共8页
Journal of Jilin Jianzhu University
基金
吉林省科技厅重点研发项目(20220203063SF)。
关键词
废弃陶瓷混凝土
复杂环境
耐腐蚀性
抗压强度
微观结构
waste ceramic concrete
complex environment
corrosion resistance
compressive strength
microstructure
