Prediction model for carbonation depth of concrete subjected to freezing-thawing cycles

2017 International Symposium on Application of Materials Science and Energy Materials

材料科学;能源学

Xiao, Qian Hui^1 ; Li, Qiang^1 ; Guan, Xiao^1 ; Zou, Ying Xian^1

Institute of Architecture and Civil Engineering, Xi'An University of Science and Technology, Xi'an

710054, China^1

关键词: Carbonation depth;    Concrete carbonation;    Concrete durability;    Concrete neutralizations;    Freezing thawing cycles;    Indoor simulation test;    Portland cement concretes;    Variation regularity;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/322/2/022048/pdf
DOI  :  10.1088/1757-899X/322/2/022048

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Through the indoor simulation test of the concrete durability under the coupling effect of freezing-thawing and carbonation, the variation regularity of concrete neutralization depth under freezing-thawing and carbonation was obtained. Based on concrete carbonation mechanism, the relationship between the air diffusion coefficient and porosity in concrete was analyzed and the calculation method of porosity in Portland cement concrete and fly ash cement concrete was investigated, considering the influence of the freezing-thawing damage on the concrete diffusion coefficient. Finally, a prediction model of carbonation depth of concrete under freezing-thawing circumstance was established. The results obtained using this prediction model agreed well with the experimental test results, and provided a theoretical reference and basis for the concrete durability analysis under multi-factor environments.