海砂混凝土中钢筋锈蚀情况研究
|
摘要
对各种海砂混凝土体系下的钢筋成型钝化膜,再通电加速腐蚀对钢筋进行破钝,并综合电化学方法和钢筋失重率对比研究了各体系下的混凝土中钢筋锈蚀规律。结果表明,淡水拌合淡化海砂混凝土体系中的钢筋耐锈蚀能力较好;随着Cl~-浓度的提高,钢筋的腐蚀行为越严重,但是存在临界Cl~-浓度。经过淡化处理的海砂使其氯离子含量降低至一定值内,是可以代替河砂使用。若直接用海砂来配制混凝土,则需要使混凝土内部生成或者本身带有较强的碱性物质,进而才能抑制高氯离子含量的混凝土体系中钢筋的锈蚀行为。
The passivation films of steel bars are formed under various concrete systems, and the steel bars are blunted by electric accelerated corrosion. Corrosion law of steel bars in various concrete systems is compared by electrochemical methods and weight loss rate of steel bars. The results show that, corrosion resistance of steel bars in washed sea sand concrete system with fresh water is better. With the increasing of Cl~- concentration, corrosion behavior of steel bar is more serious, but there is a critical Cl~- concentration. Sea sand resources can be used instead of river sand by washed treatment to reduce Cl~- content to a certain value. In order to prepare concrete with sea sand, it is necessary to make concrete internally generated or have strong alkaline substances to inhibit corrosion behavior of steel bar in concrete system with high Cl~- content.
The passivation films of steel bars are formed under various concrete systems, and the steel bars are blunted by electric accelerated corrosion. Corrosion law of steel bars in various concrete systems is compared by electrochemical methods and weight loss rate of steel bars. The results show that, corrosion resistance of steel bars in washed sea sand concrete system with fresh water is better. With the increasing of Cl~- concentration, corrosion behavior of steel bar is more serious, but there is a critical Cl~- concentration. Sea sand resources can be used instead of river sand by washed treatment to reduce Cl~- content to a certain value. In order to prepare concrete with sea sand, it is necessary to make concrete internally generated or have strong alkaline substances to inhibit corrosion behavior of steel bar in concrete system with high Cl~- content.
引文
[1]卞立波,宋少民,李飞.海砂混凝土耐久性能研究[J].混凝土与水泥制品,2012(2):11-14.
[2]周俊龙,欧忠文,江世永,等.掺阻锈剂掺合料海水海砂混凝土护筋性探讨[J].建筑材料学报,2012,15(1):69-74.
[3]苏卿,陈艾荣,赵铁军.淡化海砂混凝土中钢筋的锈蚀特征[J].新型建筑材料,2012,39(8):48-52+55.
[4]施养杭,王丹芳,吴泽进.海砂混凝土及其耐久性保护[J].工程力学,2010,27(S2):212-216.
[5]毛江鸿,金伟良,张华,等.海砂混凝土建筑的耐久性提升技术及应用研究[J].中国腐蚀与防护学报,2015,35(6):563-570.
[6]王晶,倪博文,周永祥,等.利用未淡化海砂配制超高性能混凝土的研究[J].混凝土与水泥制品,2019(1):1-4.
[7]XU J X,JIANG L H.Effectiveness of inhibitors in increasing chloride threshold value for steel corrosion[J].Water Science and Engineering,2013:3(6).354-363.
[8]杜雅莉,张俊喜,蒋俊,等.Cl-浓度渐变的混凝土孔隙液中钢筋的腐蚀过程[J].中国腐蚀与防护学报,2013,33(4):331-338.
[9]陈乔,丛钢,杨长辉.碱矿渣混凝土氯离子渗透及钢筋锈蚀性能[J].混凝土,2009(6):59-61.
[2]周俊龙,欧忠文,江世永,等.掺阻锈剂掺合料海水海砂混凝土护筋性探讨[J].建筑材料学报,2012,15(1):69-74.
[3]苏卿,陈艾荣,赵铁军.淡化海砂混凝土中钢筋的锈蚀特征[J].新型建筑材料,2012,39(8):48-52+55.
[4]施养杭,王丹芳,吴泽进.海砂混凝土及其耐久性保护[J].工程力学,2010,27(S2):212-216.
[5]毛江鸿,金伟良,张华,等.海砂混凝土建筑的耐久性提升技术及应用研究[J].中国腐蚀与防护学报,2015,35(6):563-570.
[6]王晶,倪博文,周永祥,等.利用未淡化海砂配制超高性能混凝土的研究[J].混凝土与水泥制品,2019(1):1-4.
[7]XU J X,JIANG L H.Effectiveness of inhibitors in increasing chloride threshold value for steel corrosion[J].Water Science and Engineering,2013:3(6).354-363.
[8]杜雅莉,张俊喜,蒋俊,等.Cl-浓度渐变的混凝土孔隙液中钢筋的腐蚀过程[J].中国腐蚀与防护学报,2013,33(4):331-338.
[9]陈乔,丛钢,杨长辉.碱矿渣混凝土氯离子渗透及钢筋锈蚀性能[J].混凝土,2009(6):59-61.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |