The Research Of Influence Of Lithium Slag Concrete On Corrosion Resistance Under Dry Wet Cycles

With the improvement of economic level and the rapid development of infrastructure in our country,the concrete material makes a great contribution,at the same time,as a result of chlorine salt durability failure caused by corrosion,not only causes the huge waste of the economy,but also brings great pressure to energy resources and the environment.The development of sustainable concrete requires the future concrete not only develops towards the direction of the long life cycle,but also narrows the waste of energy resources.Guaranteeing the performance while making effective utilization of industrial waste as a substitute for cement clinker,not only save raw materials,but also reduce industrial waste heap pressure to the environment.Lithium slag is the industrial waste after the production of lithium battery remnant,Xinjiang Province is the largest production base of lithium in China even in the whole Asia,the lithium slag deposition of Xinjiang is at the top of the few lithium saltworks in the nation.The limitations of the regional industry make the researches of the lithium slag as concrete admixture are relatively fewer than others.Based on the above reasons,in this paper,used the dosage of lithium slag as core variables,under the effect of soaking and dry-wet circulation resistance,chloride ion penetration performance of discrete water cement ratio of concrete is investigated.By comparing the changes in the total mass of the erosion of concrete specimens before and after,ensure that the overall evaluation of performance of resistance to chloride ion penetration of lithium slag concrete under unlike conditions of various dosages.It is possible to conclude that:at the same age,chlorine ion content of the concrete specimen,under soaking and dry-wet circulation,increases linearly with the increase in water-cement ratio.With the same water-cement ratio,the amount of chloride ion infiltration within the soaking specimens is bigger than the dry-wet circulation specimen;under the same erosion environment,chloride ion content of the specimen doped with lithium slag is less than blank specimen,and,when the lithium slag content is 20%,the internal chloride ion content reaches minimum value.It is also concluded that,infiltration amount of chloride ion per unit area of all specimens in the form of logarithmic function of the growth with age.Take core boring sampling from the specimens after erosion,according to the regulations for determining the water soluble chloride ion content of sampling powder,obtains that the chloride ion content decreases with the increases of depth of the specimens,and the chloride ion content at each depth of specimen increases with the prolongation of age.Specimen with same proportion,under the dry-wet circulation effect,the chloride ion content of shallow(0～10 mm)in specimens grow rapidly than the soaking specimens,at the deeper depth,chloride ion concentration of soaking specimens are higher than dry-wet circulation specimen;compared with blank specimen and other lithium slag content of specimen,chlorine ion concentration of 20%lithium slag content in concretes all reach the lowest level.Being dependent on the relationship between the chloride ion concentration and the actual measurement of corresponding depth,according to Fick’s second law,use Origin software to fit the chloride ion diffusion coefficient.It is concluded that:with the same water cement ratio,diffusion coefficient of soaking effect is greater than the dry-wet circulation;The influence of water-cement ratio on the chloride ion diffusion coefficient is larger,the incorporation of lithium slag effectively improved the permeability of concrete.With the increase of age,the diffusion coefficients of the specimens attenuate according to the relationship,the time dependence index of 20%dosage of lithium slag concrete all greater than 1,decay rapidly.Finally,with the measured data stratified calculation and GM(1,1)model were carried out on the chloride ion diffusion coefficient of concrete,it provides the method and basis for the further evaluation of chloride ion.