Study on the compressive performance and microstructure of multi-solid waste concrete
In order to solve the problem of iron tailing powder accumulation and promote the resourceful reuse of iron tailing powder,steel slag powder and phosphorus slag powder were used as admixtures instead of cement to prepare concrete,exploring the effect of ternary admixtures on the compressive strength of concrete,and testing the effect of different water cement ratios,the grinding time of iron tailing powder,the amount of admixtures,and the ratio of admixtures on the compressive strength of concrete.The results showed that 0.46 water-binder ratio promoted the late hydration reaction of ternary admixture,mechanical grinding for 2.0 h helped to improve the activity of iron tailing powder,steel slag powder and phosphorus slag powder had a coupling effect,and the generation of calcium hydroxide by the hydration of steel slag powder helped the hydration of phosphorus slag powder.When the dosage of iron tailing powder,phosphorus slag powder and steel slag powder are 6.0％,8.0％and 16.0％respectively,the strength reached up to 45.0 MPa at 28 d.The microanalysis showed that when the dosage of admixture is 30％,the porosity of spcimen is better than that with 20％dosage,the admixture optimized the pore structure of the concrete.
iron tailingsphosphorus slagsteel slagcompressive strengthhydration reactioninterface transition zone
万方数据
维普
