Study on chloride attack resistance of concrete with lithium slag content

Abstract

The demand for lithium batteries in electronic products is constantly increasing, and a large amount of solid waste is generated during the production of lithium batteries. These wastes are not only harmful to the environment, but more importantly, the cost of processing the wastes is very high. To reduce the harm caused by lithium slag waste and increase the chloride ion penetration resistance of concrete, this paper designs C20, C30, C40, and C60 concrete with lithium slag contents of 0 %, 10 %, 20 %, and 30 %. The effects of different lithium slag contents on the compressive strength, electric flux, and porosity of concrete specimens were studied. The study found that for C20, C40, and C60 concrete, the compressive strength decreases with the increase of lithium slag content. For C30 concrete, the compressive strength shows a trend of increasing first and then decreasing with the increase of lithium slag content. For the electric flux of C20, C30, and C40 concrete, it shows a trend of decreasing with the increase of lithium slag content. For the porosity of C20, C30, and C40 concrete, it shows a trend of first decreasing and then increasing with the increase of lithium slag content. Combining Fick's second law and the law of conservation of mass, a chloride ion penetration model of lithium slag concrete under the action of different lithium slag contents was established. The results show that the penetration performance of chloride ions in the immersion environment conforms to the experimental law; the maximum error between the simulation results and the test results is at 360 min of C30-30LS, and the error value is 14.49 %.