Abstract
In order to investigate the chloride ion penetration resistance of coal gangue concrete under multi-factor comprehensive action, the non-steady-state accelerated chloride ion migration test was used to test the chloride diffusion law of coal gangue concrete specimens by crack width, curing temperature and water-cement ratio. Three groups of crack width (0 mm, 0.05 - 0.12 mm, 0.12 - 0.2 mm), three curing temperatures (high temperature 45, medium temperature 25, low temperature 10), three water cement ratios (0.3, 0.4, 0.5) were set in the experiment. The results show that when the curing temperature and water cement ratio are constant, the crack width less than 0.12 mm has little effect on the chloride content and chloride diffusion coefficient. When the crack width is larger than 0.12 mm, the chloride penetration depth increases with the crack width. The resistance to chloride ion penetration of gangue concrete is greatly influenced by the water cement ratio. The influ-ence degree of three factors on chloride ion migration coefficient of gangue concrete is as follows: water cement ratio > crack width > curing temperature.
Highlights
With the acceleration of China’s modernization process, coal gangue is accompanied by coal mining and the use of coal resources
The results show that when the curing temperature and water cement ratio are constant, the crack width less than 0.12 mm has little effect on the chloride content and chloride diffusion coefficient
It can be seen from the graph that when the curing temperature is constant, the chloride ion content of three kinds of gangue concrete with different crack widths decreases with the increase of penetration depth, and the specimen without cracks is more obvious
Summary
With the acceleration of China’s modernization process, coal gangue is accompanied by coal mining and the use of coal resources. Coal gangue can be used as aggregate to prepare concrete after crushing and screening, which can reduce the mining and utilization of ore, and has remarkable economic benefits. The main obstacle to the application of gangue concrete structure is that its durability research is insufficient compared with ordinary concrete, such as chloride ion penetration resistance. Research has mainly discussed the influence of gangue and admixture content on chloride ion penetration resistance of concrete [4] [5]. The effect of different crack width, curing temperature and water-cement ratio on chloride ion permeability [6]-[12] of gangue concrete was studied by using the unsteady accelerated chloride ion migration test [13]
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