|Table of Contents|

Chloride Diffusion Law in Recycled Concrete Under Biaxial Compression(PDF)

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

Issue:
2021年02期
Page:
90-98
Research Field:
Publishing date:

Info

Title:
Chloride Diffusion Law in Recycled Concrete Under Biaxial Compression
Author(s):
YING Jing-wei1; 2;  QIAN Shao-tong1;  QIN Sheng-kun1; 3
1. College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, Guangxi, China; 2. Key Laboratory of Engineering Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning 530004, Guangxi, China
Keywords:
recycled concrete;  chloride diffusion coefficient;  biaxial compression;  stress ratio;  pore structure
PACS:
TU528
DOI:
10.19815/j.jace.2020.09028
Abstract:
In order to study the chloride ion transport characteristics of recycled concrete under complex stress state. Firstly, recycled coarse aggregate with different properties was obtained by crushing the parent concrete with different water cement ratio, and biaxial compression tests were carried out on natural concrete and recycled concrete with different properties, then combined with electric field to accelerate chloride diffusion and biaxial compression device, the chloride diffusion coefficients of different types of recycled aggregate concrete and natural aggregate concrete under different load levels and stress ratios were tested. The micro pore structure of the concrete was tested by mercury porosimeter. Finally, a theoretical model of the chloride diffusion coefficient of recycled concrete considering biaxial stress level, water absorption of recycled aggregate and volume fraction of coarse aggregate was established and verified experimentally. The results show that the attached old mortars in the recycled aggregates from different parent concretes have different pore structures, and the porosity of old mortar in recycled concrete increases with the increase of water cement ratio of parent concrete, which will affect the chloride ion diffusivity of the recycled concrete. For the same stress ratio, with the increase of biaxial load stress level, the chloride ion diffusion coefficient of recycled concrete generally shows the trend of decreasing first and then rising, and the chloride ion diffusion coefficient of recycled concrete appears the minimum when the stress level ratio is about 0.5. Under biaxial compressive load, chloride ion diffusion coefficient of recycled concrete from parent concrete with water cement ratio of 0.4, 0.5 and 0.6 decreases to 0.76%, 0.78% and 0.78% at most than that without load, respectively.

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Last Update: 2021-03-20