Damage model of fresh concrete in sulphate environment
来源期刊：中南大学学报(英文版)2015年第3期
论文作者：ZHANG Jing-shu(张敬书) ZHANG Yin-hua(张银华) FENG Li-ping(冯立平) JIN de-bao(金德保) WANG Chao-cheng(汪朝成) DONG Qing-you(董庆友)
文章页码：1104 - 1113
Key words：fresh concrete; sulphate corrosion; corrosion coefficient; computational model
Abstract: A model of damage to fresh concrete in a corrosive sulphate environment was formulated to investigate how and why the strength of corroded concrete changes over time. First, a corroded concrete block was divided into three regions: an expanded and dense region; a crack-development region; and a noncorroded region. Second, based on the thickness of the surface corrosion layer and the rate of loss of compressive strength of the corroding region, a computational model of the concrete blocks’ corrosion-resistance coefficient of compressive strength in a sulphate environment was generated. Third, experimental tests of the corrosion of concrete were conducted by immersing specimens in a corrosive medium for 270 d. A comparison of the experimental results with the computational formulae shows that the calculation results and test results are in good agreement. A parameter analysis reveals that the corrosion reaction plays a major role in the corrosion of fresh concrete containing ordinary Portland cement, but the diffusion of the corrosion medium plays a major role in the corrosion of concrete mixtures containing fly ash and sulphate-resistant cement. Fresh concrete with a high water-to-cement ratio shows high performance during the whole experiment process whereas fresh concrete with a low water-to-cement ratio shows poor performance during the late experiment period.
ZHANG Jing-shu(张敬书)1, 2, ZHANG Yin-hua(张银华)2, 4, FENG Li-ping(冯立平)2, 5, JIN de-bao(金德保)3, WANG Chao-cheng(汪朝成)2, 5, DONG Qing-you(董庆友)1, 6
(1. Key Laboratory of Mechanics on Disaster and Environment in Western China
(Ministry of Education), Lanzhou 730000, China;
2. College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China;
3. Gansu Architecture Design &Consultation Co., Ltd., Lanzhou 730000, China;
4. Gansu Architectural Design and Research Institute, Lanzhou 730070, China;
5. China Triumph International Engineering Co., Ltd., Shanghai 200063, China;
6. Shanghai Zhongfang Architectural Design Co., Ltd., Shanghai 200021, China)
Abstract:A model of damage to fresh concrete in a corrosive sulphate environment was formulated to investigate how and why the strength of corroded concrete changes over time. First, a corroded concrete block was divided into three regions: an expanded and dense region; a crack-development region; and a noncorroded region. Second, based on the thickness of the surface corrosion layer and the rate of loss of compressive strength of the corroding region, a computational model of the concrete blocks’ corrosion-resistance coefficient of compressive strength in a sulphate environment was generated. Third, experimental tests of the corrosion of concrete were conducted by immersing specimens in a corrosive medium for 270 d. A comparison of the experimental results with the computational formulae shows that the calculation results and test results are in good agreement. A parameter analysis reveals that the corrosion reaction plays a major role in the corrosion of fresh concrete containing ordinary Portland cement, but the diffusion of the corrosion medium plays a major role in the corrosion of concrete mixtures containing fly ash and sulphate-resistant cement. Fresh concrete with a high water-to-cement ratio shows high performance during the whole experiment process whereas fresh concrete with a low water-to-cement ratio shows poor performance during the late experiment period.
Key words:fresh concrete; sulphate corrosion; corrosion coefficient; computational model
