The Study On The Effect Of Lithium Slag Powder And Fly Ash On The Chloride Penetration Of Cement-based Material

With the development of industry in our country and along with a large amountof industrial waste residue and tailings produced. Therefore, how to dispose of thewaste residue became the focus of attention. The fly ash, slag, silica fume and otherwastes as the active mineral admixtures which could effectively reduce the damage ofthe chloride ion erosion in concrete has been confirmed by many researchers at homeand abroad. China have the largest spodumene reserves, and only in Xinjiangprocessing the lithium slag to lithium slag powder. But because of the research of thedifferent concrete performance with lithium slag powder is not enough, failed to givethe designers and constructor enough basis of design and construction which thesafety and durability performance of the concrete with lithium slag, thus limiting thepromote of the application of lithium slag waste recycling and lithium slag concrete inconstruction engineering. Therefore, the research on the influence of lithium slagpowder to the durability in cement-based materials is very realistic.This paper studied the performance of every age including water absorption,compression strength and chloride penetration in different water-binder ratio ofcement-based material with the lithium slag and fly ash in certain dosages; Thescanning electron microscope images which using the digital processing softwareimagepro-plus quantitative analysis the microscopic structure; And used the ESA(electric acoustic amplitude) signal by electric acoustic technology to measure thezeta potential of the cement suspension in its actual concentration, researched the zetapotential of the cement suspension with lithium slag and fly ash as different dosagesand analyzed the particle dispersion of two kinds of mineral admixtures in alkalineenvironment.The research results showed: The water absorption at age of28days of thelithium slag-cement paste is lower than the fly ash-cement paste system by three kindsof water-binder ratio when contrast of lithium slag and fly ash in same dosages replaced the cement; With comparison of different dosages of lithium slag, which theoptimal compressive strength is at25%dosages. The speed of lithium slag hydrationincreased and the corresponding mortar density increased with the time which makethe value of compressive strength increased over the control group and fly ash-cementsystem. So it could be known as the addition of lithium slag can improve themicrostructure of cement-based material and the macro mechanical properties; Thecoulomb values at age of28days of lithium slag-cement paste are lower than thecontrol group and decreased with the replaced dosages increased. Although the extentof fly ash replacement dosages change is bigger than lithium slag, the coulomb valuesdegree of the fly ash-cement paste is not very obvious; Contrast of the hydration zetapotential of the lithium slag and fly ash mixed with cement, the absolute value of zetapotential of lithium slag replaced cement in different dosages are higher than the flyash replaced cement, the results showed that the performance of partial dispersion ofthe lithium is better in the alkaline environment; After processing the scanningelectron microscopy gray image which the pore number is in the range of67-1142, theporosity increased with the number of pore increased, the porosity of the paste afteraddition with lithium slag and fly ash have significantly improved.