盐渍土环境下陶瓷再生梯度混凝土加速锈蚀试验  

Accelerated Corrosion Test of Ceramic Recycled Gradient Concrete in Saline Soil Environment

作　　者：乔宏霞[1] 彭宽 陈克凡 冯琼[1] 朱翔琛 QIAO Hongxia;PENG Kuan;CHEN Kefan;FENG Qiong;ZHU Xiangchen(School of Civil Engineering,Lanzhou University of Technology,Lanzhou,730050,China;College of Intelligent Manufacturing,Chengdu Technological University,Chengdu 610031,China;School of Architecture and Rail Transit,Xi’an Vocational and Technical College,Xi’an 710077,China;School of Civil Engineering,Longdong University,Qingyang 745000,China)

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050 [2]成都工业学院智能制造学院,四川成都610031 [3]西安职业技术学院建筑与轨道交通学院,陕西西安710077 [4]陇东学院土木工程学院,甘肃庆阳745000

出　　处：《应用基础与工程科学学报》2025年第1期256-262,共7页Journal of Basic Science and Engineering

基　　金：国家自然科学基金项目(51868044)。

摘　　要：针对钢筋再生混凝土结构在西部盐渍土地区易产生钢筋锈蚀导致再生混凝土开裂的问题,提出了一种陶瓷再生梯度混凝土.采用恒电流加速法对埋置于盐湖土壤中的试件进行通电,当试件开裂后测定钢筋的极化曲线,利用电镜扫描(SEM)和X射线能谱仪(XPS)分析钢筋的锈蚀产物,计算各组锈蚀产物的质量分数,并利用Eighted-Averaging法推算试件开裂时锈蚀物的体积膨胀率.研究结果表明:N-60组陶瓷再生梯度混凝土抵抗锈蚀膨胀力的能力最佳;钢筋锈蚀产物的主要成分为Fe_(3)O_(4)、FeOOH、Fe_(2)O_(3),与自然条件下钢筋的产物一致,且产物中Fe_(2)O_(3)的含量最高;基于各组锈蚀后钢筋的极化曲线和锈蚀膨胀率可以推断:在盐渍土环境下,钢筋通电加速锈蚀可以模拟自然环境下的锈蚀状况,且具有较好的适用性.In view of the problem that steel bar corrosion easily causes cracking of recycled concrete in saline soil area of western China,a kind of ceramic recycled gradient concrete is proposed.The polarization curves of steel bars were measured after cracking.The corrosion products of steel bars were analyzed by scanning electron microscopy(SEM)and X-ray energy spectrometry(XPS).The mass fraction of corrosion products was calculated.The volume expansion rate of corrosion products was calculated by Eighted-Averaging method.The results show that N-60 group ceramic regenerated gradient concrete has the best resistance to corrosion and expansion.The main components of steel corrosion products are Fe_(3)O_(4),FeOOH and Fe_(2)O_(3),which are consistent with the products under natural conditions,and the content of Fe_(2)O_(3)in the products is the highest.Based on the polarization curves and corrosion expansion rate of steel bars after corrosion,it can be inferred that in saline soil environment,the corrosion products are mainly composed of Fe_(3)O_(4),FeOOH and Fe_(2)O_(3).The electric accelerated corrosion steel bar can simulate the corrosion condition in natural environment,and has good applicability.

关 键 词：陶瓷再生梯度混凝土 通电加速锈蚀 极化曲线 Eighted-Averaging推算法 钢筋锈蚀膨胀率 

分 类 号：TU528[建筑科学—建筑技术科学]