钢渣—矿渣复合胶凝材料的制备及胶凝活性激发试验研究

为了提高钢渣和矿渣的高附加值利用率以及钢渣在胶凝材料中的掺量，研究了钢渣与矿渣掺量、质量比和胶凝活性激发方式对复合胶凝材料抗折、抗压强度的影响，并采用X射线衍射、扫描电镜和热重分析等检测手段探究了钢渣—矿渣复合胶凝材料的水化机理。结果表明：钢渣矿渣掺量为80%、钢渣矿渣质量比为5∶5、钢渣粉磨时间为80 min（比表面积为509 m2/kg）时，钢渣—矿渣复合胶凝材料的28 d抗折强度为7.3 MPa、抗压强度为31.3 MPa；选取NaOH、Na2CO3、Na2SO4和水玻璃为激发剂对胶凝材料活性进行激发，只有水玻璃提高了复合胶凝材料的活性，且当水玻璃模数为2、Na2O当量为4%时，其28 d抗折强度为8.4 MPa、抗压强度为43.0 MPa。分析水玻璃激发胶凝材料的水化产物发现：其微观形貌紧实致密，生成的C—S—H凝胶、Ca(OH)2和Aft相互交织，提高了胶凝材料的强度。

Experimental Study on Preparation of the Steel Slag and Slag Composite Cementitious Material and Its Gelling Activity Inspiration

In order to improve the utilization rate of steel slag and slag high value added and the admixture of steel slag in cementitious materials,the effects on the compressive strength and flexural strength of the composite cementitious materials were investigated based on different steel slag slag admixtures,ratios and different excitation methods of cementitious activity,and the hydration mechanism of the steel slag slag composite cementitious materials were investigated using X ray diffraction,scanning electron microscopy and thermogravimetric analysis and other testing methods.The results showed that when the steel slag slag dosing was 80%,the steel slag slag mass ratio was 5∶5,and the grinding time of steel slag was 80 min (specific surface area was 509 m2/kg),the 28 d flexural strength of the steel slag slag composite cementitious material was 7.3 MPa and the compressive strength was 31.3 MPa.When NaOH,Na2CO3,Na2SO4 and water glass were selected as the excitation agents,only water glass improved the activity of the composite gelling material,and its 28 d flexural strength was 8.4 MPa and compressive strength was 43.0 MPa when the modulus of water glass was 2 and the Na2O equivalent was 4%.Through SEM microscopic morphology and XRD analysis of the gelling hydration products with the addition of water glass,the microscopic morphology was tight and dense,and the generated C—S—H gel,Ca(OH)2 and Aft interweave with each other,which improves the strength of the gelling material.