钢渣电解锰渣赤泥复合胶凝材料的水化热研究

本试验选用电解锰渣、赤泥、钢渣作为混合材制备复合胶凝材料,系统优化混合材配比,利用微量热仪法测试了不同掺量混合材的复合水泥水化热,结合复合水泥胶砂强度情况,采用X射线衍射分析了混合材对水泥早期水化及其火山灰放热行为的规律和影响机理。结果表明:当混合材掺量为50%,赤泥:电解锰渣:钢渣为1∶2∶3时,复合水泥胶砂28 d强度可达到38.6 MPa;与普通硅酸盐水泥相比,钢渣、电解锰渣、赤泥的掺入可消耗多余Ca(OH)2,有助于水泥水化产物中钙矾石的稳定,并且C-S-H凝胶矿物相发育得到一定改善。复合胶凝材料水化放热速率降低,放热峰延缓出现,放热总量显著减少。

Study on Preparation of Composite Cement and Hydration Heat from Steel Slag,Electrolytic Manganese Slag and Red Mud

In this work, electrolytic manganese slag, red mud and steel slag were mixed to prepare composite Portland cement. The ratio of mixed materials was optimized, and the influence of different mixed materials on the hydration heat and heat release rate of cement was tested by microcalorimeter method. The exothermic behavior of volcanic ash reaction during 3 days of steel slag-electrolytic manganese slag-red mud mixed cement was analyzed. According to the strength of composite cement mortar, the influence mechanism of mixed materials on the early hydration of cement and the exothermic behavior of volcanic ash was studied by X-ray diffraction. The results show that: When the mixture replaces 50% Portland cement, red mud: electrolytic manganese slag: steel slag is 1 ∶ 2 ∶ 3, the composite cementitious material 28 d strength can reach 38.6 MPa;The incorporation of steel slag, electrolytic manganese slag and red mud can consume significantly excess Ca(OH) 2 , which contributes to the stability of ettringite in cement hydration products, reduces the hydration heat of cementitious materials, and shifts the exothermic peak backwards. The problem of excessive hydration heat caused by the simultaneous release of the cement material is avoided.