Experimental investigation on the effect of steel slag and fly ash on the properties of sulphoaluminate cement mortar
Sulphoaluminate cement(SAC)is characterized of rapid setting,early strength development,good permeability resistance and chemical corrosion resistance,for which SAC is widely used in practical engineerings like rapid repair,water conservancy and hydropower,underground pipe network and marine environment.However,the high cost of SAC limits its further development.It is reported that cement replaced with industrial wastes have desirable performance and economic benefits.The effects of steel slag and fly ash on the workablility,mechanical strength and impermeability of sulphoaluminate cement mortar(SACM)were studied.Then hydration products and microstructure of SACM were analyzed by means of SEM and XRD.The results show when steel slag content reaches 30％,the final setting time of mortar is 70 min,which is 28.5％shorter than the pure SACM.Fly ash significantly improves the fluidity due to its"ball effect".The two admixtures will increase the water absorption of SACM.And the two admixtures are also detrimental to the mechanical properties and impermeability,for their low reactivity.The mechanical properties and impermeability of SACM can be maximally maintained,but with shorter setting time,by incorporating 10％steel slag.The experimental group with 10％steel slag has the best comprehensive performance,as well as certain environmental protection and economic value.
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