关键词: 预测公式;再生粗骨料混凝土;绝对用水量;影响系数;误差分析

Abstract: In order to ensure the appropriate construction performance of recycled concrete, and to explore the influence of recycled coarse aggregate on the water consumption of recycled concrete In the present paper, the influences of recycled coarse aggregate quality and replacement on the absolute water consumption of recycled coarse aggregate concrete were systemically studied.Therefore, three types of recycled coarse aggregate with different quality were used to prepare recycled concrete.On the basis of absolute water consumption of ordinary concrete, the predicting equation for the absolute water consumption of recycled coarse aggregate concrete based on aggregate quality and replacement rate for the first time was proposed hereby, and the error of the prediction formula was compared based on the test date.The results indicate that there is a linear relationship between the absolute water consumption and the replacement rate of recycled coarse aggregate concrete. The absolute water consumption is significantly reduced with the improvement of recycled coarse aggregate.The maximum calculation error of recycled aggregate concrete is -1.97%, which has a high accuracy and good applicability.

Key words: prediction formula;recycled coarse aggregate concrete;absolute water consumption;influence coefficient;error analysis