«上一篇/Previous Article|本期目录/Table of Contents|下一篇/Next Article»

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

40卷

期数:

2023年01期

页码:

49-56

栏目:

建筑材料

出版日期:

2023-01-10

文章信息/Info

Title:

Research on transportation mechanism of chloride ion in concrete with joint

文章编号:

1673-2049(2023)01-0049-08

作者:

延永东¹,司有栋¹,陆春华¹,高生宇²,刘雪扬¹

(1. 江苏大学 土木工程与力学学院,江苏 镇江 212013; 2. 上海宝冶集团有限公司,上海 201941)

Author(s):

YAN Yongdong¹, SI Youdong¹, LU Chunhua¹, GAO Shengyu², LIU Xueyang¹

(1. Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang 212013, Jiangsu, China; 2. Shanghai Baoye Group Corp., Ltd., Shanghai 201941, China)

关键词:

混凝土接缝;  石灰石粉;  氯离子;  数值模拟

Keywords:

concrete joint;  limestone powder;  chloride ion;  numerical simulation

分类号:

TU528.45

DOI:

10.19815/j.jace.2021.09113

文献标志码:

A

摘要:

为得出不同类型接缝及石灰石粉含量对混凝土构件在氯盐环境中的耐久性影响,设计了一侧为普通混凝土、另一侧为石灰石粉混凝土、中间为不同类型接缝的组合试件。将养护后的试件在10%浓度的氯盐溶液中浸泡270 d后取样,检测接缝处及其两侧混凝土内的自由氯离子浓度。结果表明:在同一试件内,接缝处的氯离子浓度最大,距接缝0～20 mm处混凝土内的氯离子浓度向远离接缝方向逐渐减小,距接缝20 mm之外混凝土内的氯离子浓度基本相等; 相同侵蚀时间下,同一深度处直接湿接缝内的氯离子浓度最大,凿毛接缝处次之,界面剂接缝处最小,拟合得出的3种接缝处的表观氯离子扩散系数分别为基体混凝土的1.95倍、1.87倍、1.83倍; 接缝两侧相同距离处,掺石灰石粉混凝土内的氯离子浓度均大于普通混凝土,石灰石粉掺量(质量分数)为10%、20%、30%时混凝土表观氯离子扩散系数分别增大9.8%、11.8%、65.8%; 数值模拟得到的氯离子在带接缝混凝土内的分布规律与试验结果吻合较好。

Abstract:

In order to obtain the influence of different types of joints and limestone powder contents on the durability of concrete members in chloride environment, composite specimens with one side of ordinary concrete, the other side of limestone powder concrete and the middle of different types of joints were designed. The cured specimens were immersed in 10% chloride ion concentration salt solution for 270 d, and then the specimens were taken to detect the free chloride ion concentration at the joint and the concrete on both sides. The results show that, in the same specimen, the chloride ion concentration at the joint is the largest, and the chloride ion concentration decreases gradually away from the joint in the concrete at 0-20 mm from the joint. The chloride ion concentration in concrete is basically equal at 20 mm away from the joint. Under the same erosion time, the chloride ion concentration in the direct wet joint at the same depth is the largest, followed by the rough joint, and the interface agent joint is the smallest. The chloride ion diffusion coefficients at the three joints obtained by fitting are 1.95 times, 1.87 times and 1.83 times that of the matrix concrete, respectively. At the same distance on both sides of the joint, the chloride ion concentration in concrete with limestone powder is greater than that in ordinary concrete. When the limestone powder content(mass fraction)is 10%, 20% and 30%, the chloride ion diffusion coefficient of concrete increases by 9.8%, 11.8% and 65.8%, respectively. The distribution of chloride ions in jointed concrete obtained by numerical simulation is in good agreement with the experimental results.

参考文献/References:

[1] 吴江龙.大跨径悬浇连续梁桥施工技术研究[J].公路交通科技(应用技术版),2020,16(4):207-209.
WU Jianglong.Study on construction technology of long-span cantilever continuous beam bridge[J].Highway and Traffic Technology(Applied Technology Edition),2020,16(4):207-209.
[2]沈 殷,蔡 鹏,陈立生,等.节段预制拼装混凝土桥梁剪力键接缝的抗剪强度[J].同济大学学报(自然科学版),2019,47(10):1414-1420.
SHEN Yin,CAI Peng,CHEN Lisheng,et al.Shear strength of keyed joints in segmental precast concrete bridges[J].Journal of Tongji University(Natural Science),2019,47(10):1414-1420.
[3]YOON Y S,YANG K H,KWON S J.Service life of GGBFS concrete under carbonation through probabilistic method considering cold joint and tensile stress[J].Journal of Building Engineering,2020,32:101826.
[4]YOO S W,KWON S J.Effects of cold joint and loading conditions on chloride diffusion in concrete containing GGBFS[J].Construction and Building Materials,2016,115:247-255.
[5]申艳军,张 欢,潘 佳,等.混凝土界面过渡区微-细观结构识别及形成机制研究进展[J].硅酸盐通报,2020,39(10):3055-3069.
SHEN Yanjun,ZHANG Huan,PAN Jia,et al.Research progress on identification and formation mechanism of microstructures in interface transition zone of concrete[J].Bulletin of the Chinese Ceramic Society,2020,39(10):3055-3069.
[6]延永东.氯离子在损伤及开裂混凝土内的输运机理及作用效应[D].杭州:浙江大学,2011.
YAN Yongdong.Transportation of chloride ions in damaged and cracked concrete and its action[D].Hangzhou:Zhejiang University,2011.
[7]于东超.冀北地区冻融和碳化对桥梁预制节段梁体接缝耐久性试验研究[D].张家口:河北建筑工程学院,2020.
YU Dongchao.Study on the joint durability of bridge precast section beams by freeze-thaw and carbonization in north Hebei region[D].Zhangjiakou:Hebei University of Architecture,2020.
[8]BARMAN M,VANDENBOSSCHE J M,JANSSEN D.Small-scale joint performance test for concrete pavements[J].ACI Structural Journal,2019,116(6):109-119.
[9]罗小雅.装配整体式混凝土结构连接界面区氯离子传输特性[D].徐州:中国矿业大学,2017.
LUO Xiao-ya.Characteristics of chloride penetration in interfacial zones of assembled monolithic concrete structures[D].Xuzhou:China University of Mining and Technology,2017.
[10]李国平,胡 皓,任 才,等.桥梁混凝土结构接缝的耐久性能[J].土木工程学报,2018,51(7):98-103.
LI Guoping,HU Hao,REN Cai,et al.Study on durability of joints in concrete bridge structures[J].China Civil Engineering Journal,2018,51(7):98-103.
[11]LI G P,HU H,REN C.Resistance of segmental joints to carbonation[J].ACI Materials Journal,2017,114(1):137-148.
[12]混凝土结构耐久性设计标准:GB/T 50476—2019[S].北京:中国建筑工业出版社,2019.
Standard for design of concrete structure durability:GB/T 50476—2019[S].Beijing:China Architecture & Building Press,2019.
[13]普通混凝土配合比设计规程:JGJ 55—2011[S].北京:中国建筑工业出版社,2011.
Specification for mix proportion design of ordinary concrete:JGJ 55—2011[S].Beijing:China Architecture & Building Press,2011.
[14]王德辉,史才军,贾煌飞,等.石灰石粉对混凝土耐久性能的影响[J].福州大学学报(自然科学版),2018,46(6):874-880.
WANG Dehui,SHI Caijun,JIA Huangfei,et al.Effects of limestone powder on the durability of concrete[J].Journal of Fuzhou University(Natural Science Edition),2018,46(6):874-880.
[15]彭建新,吴婷婷,胡守旺,等.氯盐环境下预应力混凝土梁桥氯离子扩散效应及其空间概率分析[J].中国公路学报,2016,29(4):50-58.
PENG Jianxin,WU Tingting,HU Shouwang,et al.Effect of chlorides diffusion and its spatial probability analysis of prestressed concrete bridge under chloride environment[J].China Journal of Highway and Transport,2016,29(4):50-58.
[16]陈惠苏,孙 伟,JOHANNES S L,等.水泥基复合材料浆体厚度分布的定量表达[J].硅酸盐学报,2007,35(12):1622-1629.
CHEN Huisu,SUN Wei,JOHANNES S L,et al.Quantitative characterization of the distribution of cement paste thickness in cementitious composites[J].Journal of the Chinese Ceramic Society,2007,35(12):1622-1629.
[17]DU X L,JIN L,MA G W.A Meso-scale numerical method for the simulation of chloride diffusivity in concrete[J].Finite Elements in Analysis and Design,2014,85:87-100.
[18]普通混凝土长期性能和耐久性能试验方法标准:GB/T 50082—2009[S].北京:中国建筑工业出版社,2009.
Standard for test methods of long-term performance and durability of ordinary concrete:GB/T 50082—2009[S].Beijing:China Architecture & Building Press,2009.
[19]田俊峰,潘德强,赵尚传.海工高性能混凝土抗氯离子侵蚀耐久寿命预测[J].中国港湾建设,2002,22(2):1-6.
TIAN Junfeng,PAN Deqiang,ZHAO Shangchuan.Prediction of durable life of HPC structures resisting chloride ion penetration in marine environment[J].China Harbour Engineering,2002,22(2):1-6.
[20]混凝土结构耐久性设计与施工指南:CCES 01—2004[S].北京:中国建筑工业出版社,2004.
Guide to durability design and construction of concrete structures:CCES 01—2004[S].Beijing:China Architecture & Building Press,2004.

相似文献/References:

备注/Memo

备注/Memo:

收稿日期:2021-09-28
基金项目:江苏省普通高校研究生科研创新计划项目(SJCX_1689); 国家自然科学基金项目(51878319,51778272)
作者简介:延永东(1982-),男,工学博士,副教授,E-mail:yand@ujs.edu.cn。

常用功能

更新日期/Last Update: 2023-01-01