Chemico-thermal treatment for quality enhancement of recycled concrete fine aggregates

摘要

Utilization of recycled concrete fine aggregates to full potential in the construction sector is necessary to increase the ecological value and solves the issues of natural sand scarcity. However, the quality of recycled concrete fine aggregates is inferior to conventional aggregates. Hence, a treatment process is obviously essential for improving the quality of recycled concrete fine aggregates that can boost their utilization to a maximum extent. This paper addresses chemico-thermal treatment, with the use of acetic acid, for improving the quality of recycled concrete fine aggregates. Results of the study conducted to assess the effect of chemico-thermal treatment on the performance of recycled concrete fine aggregates in terms of their physical, chemical, mineralogical, and surface micro structure characteristics are presented. A comparison with the results of chemical and thermal treatment is also presented. The experimental results show that the chemico-thermal treatment considerably improves the quality of recycled concrete fine aggregates. Furthermore, the compressive and flexural strength of mortar made with chemico-thermal-treated aggregates at the age of 28 days are increased to considerable level.