Effect of the optimized triple mixing method on the ITZ microstructure and performance of recycled aggregate concrete

Due to the existence of two weaknesses in the ITZ, the performance of recycled aggregate concrete (RAC) is much lower than that of natural aggregate concrete. An optimized triple mixing (OTM) method was developed to strengthen the ITZ in the RAC in this paper. It was found that OTM could dramatically improve the compressive strength, freezing and thawing resistance and water impermeability of the RAC. The reason is that supplementary...