Study on the Influence of Three Factors on Mass Loss and Surface Fractal Dimension of Concrete in Sulfuric Acid Environments

被引:15
作者
Xiao, Jie [1 ]
Long, Xiang [2 ]
Li, Long [3 ]
Jiang, Haibo [1 ]
Zhang, Yaowen [3 ]
Qu, Wenjun [4 ]
机构
[1] Guangdong Univ Technol, Sch Civil & Transportat Engn, Guangzhou 510006, Peoples R China
[2] Yuexiu Transport Infrastruct Co Ltd, Hongkong 999077, Peoples R China
[3] Guangdong Sanhe Bldg Mat Grp Co Ltd, Zhongshan 528414, Peoples R China
[4] Tongji Univ, Coll Civil Engn, Shanghai 200092, Peoples R China
基金
中国国家自然科学基金;
关键词
concrete corrosion; sulfuric acid attack; fractal dimension; mass loss; orthogonal experimental design; RESISTANCE; LIMESTONE; ATTACK; DURABILITY; SAND;
D O I
10.3390/fractalfract5040146
中图分类号
O1 [数学];
学科分类号
0701 ; 070101 ;
摘要
When exposed to sulfuric acid environments, the service life of concrete structures would be reduced due to the high alkalinity of concrete. The influence of three factors including water/cement ratio, the pH value of the solution, and the chemical composition of the aggregate on the resistance of concrete subjected to sulfuric acid has been widely investigated by previous researchers. This paper aims to investigate the influence of these three factors on the durability evaluation indicators including mass loss and surface fractal dimension through orthogonal experiments, which has been reported rarely in previous research. Four combinations of coarse and fine aggregate including gravel and river sand, gravel and crushed marble sand, crushed marble stone and river sand, and crushed marble stone and marble sand were adopted, and three water/cement ratios including 0.35, 0.45, and 0.55 were selected, and the sulfuric acid solution pH values 0.95, 2, and 4 were chosen in this paper. The results showed that the larger the water/cement ratio, the smaller the mass loss and the surface fractal dimension of the specimens, and with the decrease of the pH value of the sulfuric acid solution, the mass loss and the surface fractal dimension of the specimens would be increased. The concrete specimen containing gravel and river sand had the greatest surface fractal dimension and greatest mass loss, while the concrete specimen containing crushed marble sand had a smaller surface fractal dimension and a smaller mass loss. The dominant and secondary order of three factors on mass loss and surface fractal dimension of concrete subjected to sulfuric acid was the pH value of the solution > the chemical composition of the aggregate > the water/cement ratio.
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页数:17
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