Title: Optimisation method for durability of recycled concrete based on nano strengthening technology

Authors: Xiaoyuan Xiong; Haixia Lu

Addresses: School of Civil Engineering, Henan Vocational University of Science and Technology, Zhoukou, Henan, 466000, China ' School of Civil Engineering, Henan Vocational University of Science and Technology, Zhoukou, Henan, 466000, China

Abstract: Studying the durability optimisation problem of recycled concrete can extend the service life of concrete structures and reduce maintenance costs. Therefore, the paper proposes a durability optimisation method for recycled concrete based on nano strengthening technology. Firstly, select experimental materials for recycled concrete, analyse the factors affecting the strength of recycled coarse aggregate concrete, and determine the design scheme of recycled concrete mix proportion. Then, the recycled coarse aggregate was modified by soaking in nano SiO₂ dispersion, and dispersed for 20 minutes using YM-060S ultrasonic dispersion machine before being placed in a container to optimise the durability of recycled concrete. The results show that the improved recycled concrete in this paper has increased its water resistance by more than 16% compared to RAC, and its quality loss rate does not exceed -0.21%, indicating that the method proposed in this paper can effectively improve the durability of recycled concrete.

Keywords: nano strengthening; dispersion immersion method; frost resistance test; water penetration resistance test; concrete mix design.

DOI: 10.1504/IJMMP.2024.135797

International Journal of Microstructure and Materials Properties, 2024 Vol.17 No.1, pp.1 - 16

Received: 25 Apr 2023
Accepted: 14 Jul 2023
Published online: 05 Jan 2024 *