Abstract

Different treatment strategies have been explored in a quest to improve the properties of recycled aggregate concrete (RAC). The improvement strategies are directed towards the removal of residual layers of old mortar on the recycled coarse aggregate (RA). The removal of old mortar layer improves the bond between the new mortar and the RA that makes the quality of RAC better. Efforts have been made to remove the old mortar from the surface of the RA through abrasion process, however, there is a lack of detailed information, particularly about the beneficial effect of abrasion coupled with some chemical treatment. In the present work, the performance of RAC prepared with the RA subjected to abrasion (with the help of a Los Angeles abrasion test machine) was evaluated. The combined effect of abrasion and sodium silicate treatments of the RA on the fresh and hardened properties of RAC was also evaluated. A significant improvement in the workability, strength, and durability of RAC was noted due to abrasion treatment of the RA. Strength and durability of RAC increased significantly due to the combined effect of abrasion and sodium silicate treatment of the RA.

摘要

为了改善再生骨料混凝土 (RAC) 的性能，人们探索了不同的处理策略。改进策略旨在去除再生粗骨料 (RA) 上的旧砂浆残留层。旧砂浆层的去除提高了新砂浆与RA之间的结合力，使RAC的质量更好。已经努力通过磨损过程从 RA 表面去除旧砂浆，但是，缺乏详细的信息，特别是关于磨损与一些化学处理相结合的有益效果。在目前的工作中，评估了用经受磨损的 RA 制备的 RAC 的性能（在洛杉矶磨损试验机的帮助下）。还评估了 RA 的磨损和硅酸钠处理对 RAC 的新鲜和硬化性能的综合影响。由于 RA 的磨损处理，RAC 的可加工性、强度和耐久性显着提高。由于 RA 的磨损和硅酸钠处理的综合作用，RAC 的强度和耐久性显着提高。