基于复合材料理论的再生混凝土峰值应变模型

Model of Strain at Peak Stress for Recycled Aggregate Concrete Based on Composite Material Theory

鉴于现有模型未计入用于制造再生骨料的废弃混凝土(基体混凝土)水灰比及残余砂浆含量对再生混凝土峰值应变的影响,基于复合材料模型得到了4种考虑基体混凝土水灰比及残余砂浆含量影响的再生混凝土峰值应变预测模型,并且采用收集到的100组试验数据对模型的可靠性进行了验证.结果表明:各模型的预测结果差异较大;Hirsch模型和Counto模型的精度较高,预测结果与试验结果之比的平均值为0.978~1.000,变异系数为0.072~0.080.

Previous research shows that the water-to-cement ratio of parent concrete and residual mortar content has a significant effect on the strain at the peak stress of recycled aggregate concrete(parent concrete).However,the available models do not account for this effect.Therefore,4 different peak strain models based on the composite material theory was derived,which could account for the influence induced by water-to-cement ratio and residual mortar content.All of them have been validated against the collected 100 groups of test results.The results show that the predictions for these models differ considerably.Hirsch's model and Counto's model have relatively high accuracy.The mean value and coefficient of variation for the ratios of predictions to test results are 0.978-1.000 and 0.072-0.080,respectively.