Study on Acid Erosion Resistance of Iron Tailing-Steel Slag-Lithium Slag Concrete
This paper was proposed to analyze the acid erosion resistance of concrete and realize the efficient resource utilization by mixing iron tailings,steel slag and lithium slag in concrete.Iron tailings,steel slag and lithium slag were used as admixtures to replace part of the cement,and iron tailings crushed stone and iron tailings sand were used as coarse and fine aggregates to prepare concrete;The prepared concrete was subjected to standard curing for 28 days followed by acid erosion test for a period of 60 days;The mass loss rate,compressive strength loss rate and erosion depth were analyzed by changing the water-cement ratio and cement substitution rate,and the mechanism of acid erosion resistance of iron tailings-steel slag-lithium slag concrete was explored using MIP and SEM.The results showed that the incorporation of iron tailings,steel slag and lithium slag can reduce the mass loss rate,compressive strength loss rate and erosion depth of concrete;The lowest values of 0.12％mass loss,-7.8％compressive strength loss,and 0.6 mm erosion depth were achieved at a doping level of 30％;The rate of mass loss,rate of compressive strength loss and depth of erosion of concrete increased with the increase in water-cement ratio.Iron tailings-steel slag-lithium slag concrete in the iron tailings,steel slag,lithium slag to play the role of filling and secondary hydration reaction with the cement to make the concrete system more dense,to a large extent,to prevent the intrusion of acid;At the same time,the secondary hydration reaction consumed the CH,which is easily reacted with acid,and generated a more stable C-S-H gel,which showed better resistance to acid erosion.
iron tailingssteel slaglithium slagconcreteacid erosion
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