基于两相复合材料的煤矸石混凝土弹性模量研究

Prediction Formula of Elastic Modulus of Coal Gangue Concrete Based on Two-Phase Composite Materials

目的提出一种基于两相复合材料理论的煤矸石混凝土弹性模量预测模型,为煤矸石混凝土弹性模量的计算提供借鉴。方法基于普通混凝土弹性模量预测模型,考虑煤矸石粗骨料取代率的影响,推导得到煤矸石混凝土弹性模量预测模型;采用文献中39组自燃煤矸石和12组原状煤矸石混凝土弹性模量试验数据验证模型的可靠性。结果传统的自燃煤矸石和原状煤矸石混凝土弹性模量预测模型精度还需提高,预测结果与试验结果相差26%~31%;对于基于两相复合材料理论提出的煤矸石混凝土弹性模量预测模型中,BNC模型预测精度最高,对于自燃煤矸石和原状煤矸石混凝土,其预测结果与试验结果比值的均值分别为0.936和1.030,判定系数分别为0.839和0.943。结论BNC模型较传统预测方法能更为准确地预测煤矸石混凝土的弹性模量。

A prediction model for the elastic modulus of gangue concrete based on the theory of two-phase composite materials is presented,which provides reference for the calculation of the elastic modulus of gangue concrete.Based on the prediction model of elastic modulus of ordinary concrete,the prediction model of elastic modulus of gangue concrete is derived considering the influence of the substitution rate of coarse aggregate.The elastic modulus test data of 39 groups of spontaneous combustion gangue and 12 groups of undamaged gangue concrete were used to verify the reliability of the model.The accuracy of traditional prediction models of elastic modulus of spontaneous combustion gangue and undisturbed gangue concrete needs to be improved.The difference between the prediction results and the test results is 26%and 31%respectively.Among the prediction models for the elastic modulus of coal gangue concrete based on the two-phase composite material theory,the BNC model has the highest prediction accuracy.For spontaneous combustion coal gangue concrete and undamaged coal gangue concrete,the average ratio between the prediction results and the test results is 0.936 and 1.030 respectively,and the determination coefficient is 0.839 and 0.943 respectively.BNC model can predict the elastic modulus of gangue concrete more accurately than traditional forecasting method.