低温下物理和化学激发对矿渣活性的影响研究

低温条件下矿渣活性低、水化慢。为提高低温下矿渣的活性,通过室内试验,测试了物理粉磨对矿渣粒径分布和矿渣水泥石强度的影响、化学激发剂对矿渣水泥石强度的影响,研究了物理激发和化学激发对矿渣活性的影响。研究表明,粉磨后矿渣的比表面积由0.718 m2/cm3增大到2.181 m2/cm3,水泥石在10 ℃温度下养护24 h的抗压强度由0 MPa增至6.6 MPa;随着化学激发剂 JFJ-1 加量的增加,矿渣水泥的抗压强度先增大后减小,JFJ-1 的最优加量为4%。养护温度为10 ℃时,采用矿渣配制的密度为1.30 kg/L的低密度矿渣水泥浆体系养护24 h后的水泥石强度达6.8 MPa,渗透率0.014 5 mD。而相同的养护温度下,密度为1.92 kg/L的G级水泥浆养护24 h后的水泥石强度为1 MPa,渗透率为0.044 2 mD。由此可知,物理粉磨及化学激发剂对矿渣的活性均有较好的提高效果。 

Effect of Physical and Chemical Excitation on Slag Activity under Low Temperature

Slag has slow hydration rate and low activity at low temperature.To significantly improve the activity of slag at low temperature,the effect of physical flour grinding on the particle size of slag,compressive strength of slag slurry,and the effect of chemical activator on the compressive strength of the slag slurry were studied.After grinding,the specific surface area of the slag increased from 0.718m2/cm3 to 2.181m2/cm3,and the compressive strength increased from 0to 6.6MPa for cured slag at 10℃for 24h.The compressive strength of the slag slurry increased first then dropped as the amount of chemical activator JFJ-1increased,and the optimal percentage of JFJ-1is 4%.The compressive strength of the low density slag cement system of 1.30kg/L reached 6.8MPa with JFJ-1cured at 10℃for 24hours,and the permeability of the cement was 0.014 5mD.The compressive strength of the class G cement system with the density of 1.92kg/L reached 1MPa after cured at 10℃for 24hours,and the permeability of the cement was 0.044 2mD.Both physical flour grinding and chemical activator can improve the activity of the slag at low temperature.