Effect of quality of recycled coarse aggregate on the corrosion resistance of concrete

LIU Hui; WANG Zhen; HAO Yali; ZHU Pinghua; WANG Xinjie; CHEN Chunhong

doi:10.11835/j.issn.2096-6717.2021.043

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Effect of quality of recycled coarse aggregate on the corrosion resistance of concrete

Civil Engineering | 更新时间：2023-03-07

- Effect of quality of recycled coarse aggregate on the corrosion resistance of concrete
- Journal of Civil and Environmental Engineering Vol. 45, Issue 2, Pages: 187-193(2023)
- 作者机构：
  
  常州大学环境与安全工程学院，江苏常州 213164
- 作者简介：
  
  LIU Hui (1989- ), PhD, main research interest: durability of recycled concrete structure, E-mail: liuhui@cczu.edu.cn.
  ZHU Pinghua （corresponding author）， PhD， professor， E-mail： zph@cczu.edu.cn.
- 基金信息：
  
  National Natural Science Foundation of China(51278073;51878081;52078068);Open Fund of State Key Laboratory of Silicate Materials for Architeetures (Wuhan University of Techology)(SYSJJ2020-14);Changzhou Key R & D Program (Applied Basic Research)(CJ20200079)
- DOI：10.11835/j.issn.2096-6717.2021.043
  CLC： TU528.1
- Received：15 January 2021，
  
  Published：25 April 2023
- 稿件说明：
移动端阅览
LIU Hui, WANG Zhen, HAO Yali, et al. Effect of quality of recycled coarse aggregate on the corrosion resistance of concrete[J]. Journal of Civil and Environmental Engineering, 2023, 45(2): 187-193.
DOI：

LIU Hui, WANG Zhen, HAO Yali, et al. Effect of quality of recycled coarse aggregate on the corrosion resistance of concrete[J]. Journal of Civil and Environmental Engineering, 2023, 45(2): 187-193. DOI： 10.11835/j.issn.2096-6717.2021.043.

摘要

基于硝酸加速溶蚀试验方法，分别对100%取代率下不同品质（I类、Ⅱ类和Ⅲ类）再生粗骨料混凝土和天然粗骨料混凝土的抗溶蚀耐久性进行对比研究，并从宏观力学性能退化及内部微观结构损伤方面进一步揭示混凝土抗溶蚀性能经时劣化规律和损伤机理。研究结果表明：高品质再生骨料制备的混凝土抗压强度较高，与骨料物理性能具有良好的对应关系。在溶蚀环境下，再生粗骨料混凝土的抗压强度损失率、质量损失率、溶蚀深度随溶蚀龄期的增长而逐渐增大，但随着粗骨料品质的降低，却并不一定严格增大，会出现阶段性差异。由SEM图像可知，溶蚀前后，低品质骨料混凝土界面过渡区差异明显。由溶蚀深度与溶蚀时间的拟合公式可知，3类品质骨料制备的混凝土均满足软水环境中的水工结构使用要求，低品质（Ⅲ类）再生粗骨料混凝土可用于一代服役50 a的水利工程结构。

Abstract

Based on the method of nitric acid accelerated dissolution test

the comparative study on the corrosion resistance durability of natural aggregate concrete (NAC) and recycled aggregate concrete (RAC) prepared using 100% of recycled coarse aggregate (RCA) with different qualities (class I

class Ⅱ and class Ⅲ) is performed. The degradation law and damage mechanism of corrosion resistance of RAC are further revealed from the aspects of macroscopic mechanical property degradation and internal microstructure damage. The results show that the compressive strength of recycled concrete prepared by high-quality aggregate with better physical properties is higher

and there is a good correlation between them. In the corrosion environment

the compressive strength loss rate

mass loss rate and corrosion depth of recycled coarse aggregate concrete gradually increase with the increase of corrosion age

but not strictly increase with the decrease of coarse aggregate quality

and there are periodic differences in different periods. The SEM images show that the interfacial transition zone of low-quality aggregate concrete is obviously different before and after corrosion. According to the fitting formula of corrosion depth and corrosion time

the concrete prepared by three kinds of quality aggregate can meet the requirements of hydraulic structure in soft water environment

and the recycled coarse aggregate concrete with low quality (class Ⅲ) can be used for the hydraulic engineering structure with 50 years of service.

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references

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