Prediction of compressive strength of recycled aggregate concrete based on gray correlation analysis

摘要

Recycled aggregate concrete (RAC) specimens with different water-cement ratios and replacement levels of recycled coarse aggregate (RCA) were prepared. The effects of these two factors on the slump and compressive strength of the RAC were analyzed. The Abrams formula was used to predict the compressive strength of the RAC. The relationships between the regression coefficients and physical properties of the coarse aggregate were analyzed based on the gray correlation analysis (GCA). A method based on the GCA was proposed to predict the compressive strength of the RAC. The validity of this method was verified using experimental data that was reported before. The prediction accuracy of the modified Abrams model was satisfactory, indicating that the proposed method can meet practical engineering requirements. (C) 2020 Elsevier Ltd. All rights reserved.