钢渣泡沫混凝土的保温性能及三相导热系数模型

Research on thermal insulation performance and three-phase model of thermal conductivity of steel slags foamed concrete

将细钢渣作为泡沫混凝土集料,开展钢渣泡沫混凝土导热系数及其影响因素试验研究,并分析建立气孔率、干体积密度与导热系数的关系.基于现有混凝土两相保温系数模型,结合钢渣泡沫混凝土组成结构特点,通过嵌套使用优化的两相导热系数模型推导建立了钢渣泡沫混凝土三相导热系数模型,并结合试验数据通过拟合与线性回归得到三相导热系数模型中的修正系数.利用并联模型、串联模型、Maxwell-Eucken模型等与相关试验数据进行比较,并对钢渣泡沫混凝土三相导热系数模型精度进行了评价分析.相关研究结果表明,通过调整钢渣粒径、掺量和发泡剂的用量,能够配制出干体积密度和导热系数满足要求的钢渣泡沫混凝土;不同配合比钢渣泡沫混凝土的导热系数,可以通过推导建立的三相导热系数模型进行较为准确地预测.

Experimental research on the thermal conductivity of steel slags foamed concrete and its influencing factors was carried out with the utilization of steel slags as aggregates to compound foamed concrete, and the relationship among porosity, thermal conductivity and dry bulk density of steel slags foamed concrete was analyzed. Based on the existing two-phase model of thermal conductivity of concrete and combined with the characteristics of composition structure of steel slags foamed concrete, the three-phase model of thermal conductivity of steel slags foamed concrete was derived by means of nesting the optimized two-phase model of thermal conductivity, whose correction factors was obtained through fitting and linear regression. The predictive values of series model, parallel model and Maxwell-Eucken model were in comparison with the related experimental data and the prediction accuracy of the three-phase model of thermal conductivity was evaluated. Results show that the steel slags foamed concrete meeting the requirement of thermal conductivity and dry bulk density can be obtained by adjusting the particle size and the mixing amount of steel slags and the dosage of foaming agent; the thermal conductivity of steel slags foamed concrete with different mix proportion can be accurately predicted based on the three-phase model of thermal conductivity established in in this paper.