|Table of Contents|

Research on transportation mechanism of chloride ion in concrete with joint(PDF)

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

Issue:
2023年01期
Page:
49-56
Research Field:
建筑材料
Publishing date:

Info

Title:
Research on transportation mechanism of chloride ion in concrete with joint
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)
Keywords:
concrete joint;  limestone powder;  chloride ion;  numerical simulation
PACS:
TU528.45
DOI:
10.19815/j.jace.2021.09113
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.

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Last Update: 2023-01-01