Use of Nano-SiO2 to Improve Microstructure and Compressive Strength of Recycled Aggregate Concretes

چکیده مقاله

The purpose of this paper is to provide new type of recycled aggregate concrete (RAC) incorporating nano-SiO₂. In particular, we investigate the effects of colloidal nano-silica solution on the properties of fresh and hardened concrete. The main variables included the dosage of nano-silica (including 0%, 1.5%, and 3% of cement content) and the cement content of the concrete (including 400 and 450 kg/m3). Results were compared with plain concretes. Tests were conducted to determine the mechanical properties (compressive strength) and microstructure (SEM test) of the concretes.