摘要
为解决精炼渣大量堆存问题,提高转炉渣大掺量时固废基胶凝材料的强度,对精炼渣、转炉渣、矿渣和脱硫石膏材料组成进行了优化研究。首先,通过正交试验考察精炼渣、转炉渣、矿渣和脱硫石膏对胶凝材料抗压强度的影响,并进行回归分析;然后,建立非线性回归模型,优化胶凝材料配合比;最后,采用XRD,SEM和TG-DSC等表征方法分析精炼渣、转炉渣、矿渣和脱硫石膏的协同作用机理。结果表明,Ⅰ组配合比在转炉渣掺量大于40%的情况下,胶砂抗压强度达到39 MPa,且预测值与实验值无显著差异,验证了非线性回归模型的可靠性;精炼渣早期水化生成C_(2)AH_(8),参与四元体系协同作用,各龄期的水化产物主要为钙矾石和C-S-H凝胶。因此,协同水化作用促进了钙矾石和C-S-H凝胶的生成,提高了硬化体强度,可为精炼渣资源化利用提供理论依据和数据支撑。
In order to solve the problem of massive storage of refining slag and improve the strength of solid waste based cementitious materials with large amount of converter slag,the material composition of refining slag,converter slag,blast furnace slag and desulfurization gypsum was optimized in this paper.Firstly,the effects of refining slag,converter slag,blast furnace slag and desulfurization gypsum on the compressive strength of cementitious materials were investigated by orthogonal experiment,and the regression analysis was carried out.Then,a nonlinear regression model was established to optimize the mix proportion of cementitious materials.Finally,the synergistic mechanism of refining slag,converter slag,blast furnace slag and desulfurization gypsum was analyzed by XRD,SEM and TG-DSC.The results show that when the content of converter slag in groupⅠis greater than 40%,the compressive strength of the experimental mortar is up to 39 MPa,and there is no significant difference between the predicted value and the experimental value,which verifies the reliability of the nonlinear regression model.The early hydration of the refining slag produced C_(2)AH_(8),which participated in the synergistic effect of the four element system.The hydration products of all ages were mainly ettringite and C-S-H gel.Synergistic hydration promoted the formation of ettringite and C-S-H gel and enhanced the strength of hardened specimens.The results provide theoretical basis and data support for refining slag utilization.
作者
琚永健
倪文
李颖
巴浩静
张思奇
李克庆
JU Yongjian;NI Wen;LI Ying;BA Haojing;ZHANG Siqi;LI Keqing(School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China)
出处
《河北科技大学学报》
CAS
北大核心
2022年第2期211-220,共10页
Journal of Hebei University of Science and Technology
基金
国家重点专项(2018YFC1900603)
河北省科技重大专项(21283801Z)
中央高校基本科研项目(FRF-IDRY-20-014)。
关键词
三废处理与综合利用
非金属建筑材料
非线性回归分析
正交试验
协同作用机理
精炼渣
"three wastes"treatment and comprehensive utilization
non-metallic building materials
nonlinear regression analysis
orthogonal test
synergistic mechanism
refining slag
