碳酸化预养护钢渣制备大掺量钢渣水泥的研究

Study on high carbonation precuring steel slag cement

应用碳酸化技术对比表面积为287m^2/kg的钢渣粗粉进行预养护,进行制备大掺量钢渣水泥的试验研究。实验结果表明:(1)钢渣粗粉在温度74℃,相对湿度70%～90%,CO_2气体浓度30%～40%的的条件下,碳酸化养护270min后其w(f-CaO)由5.67%降至0.34%;钢渣中的大部分f-CaO转化为CaCO_3晶体,而C_3S及C_2S基本未参与碳酸化反应。(2)由于碳酸化作用,钢渣中Ca的浸析浓度明显降低,钢渣的早期水化速度加快、早期水化活性提高。(3)应用碳酸化预养护后的钢渣粗粉制备的钢渣水泥,钢渣粗粉掺入量可达40%,3 d强度达20.6 MPa,28 d强度达44.7 MPa,并且压蒸安定性良好。

Precured steel slag （specific surface is 287 m^2/kg） by carbonation technology and experimentally produced high steel slag cement. The results showed that when the temperature was 74 ℃, relative humidity was 70%-90% and the φ（CO2） was 30%-40%, w （f-CaO） in the steel slag decreased from 5.67% to 0.34% after 270 min carbonation curing, and most of the f-CaO transformed into CaCO3, C3S and C2S didn＇ t attend the carbonation reaction; as carbonation action, the separating concentration of Ca decreased obviously and the early hydration speed up with more activity; to produce cement with the carbonation precuring steel slag, the add per- centage could reach 40%, and 3 d,28 d compressive strength was 20.6 MPa and 44.7 MPa, and the compressive heat invariability was perfect.