Work

Study on rheological properties and mechanical properties of double-mixed recycled coarse and fine aggregate concrete

Year: 2025

Type: article

Abstract: While recycled aggregates are widely studied, the dual effects of recycled coarse and fine aggregates on concrete rheology-mechanical synergy remain unclear. In order to promote the comprehensive treatment of various solid wastes in the construction industry, the working properties, rheological properties, mechanical properties, and microstructure of recycled concrete were measured by using recycled aggregate as the alternative material of concrete aggregate and C40 as the trial strength, and the substitution rates of recycled aggregate were 25%, 50%, 75% and 100%. The results show that with the increase in the content of recycled coarse and fine aggregates, the workability of concrete becomes worse, the overall trend decreases, and the yield stress and plastic viscosity increase. The mechanical properties decreased with the increase in recycled aggregate content and had the greatest influence on the tensile strength of splitting, followed by the compressive strength and the elastic modulus. Scanning electron microscopy and pore structure analysis showed that the air content, specific surface area, and spacing coefficient of the microcracks inside the recycled concrete structure were greater than those of natural concrete, resulting in a non-dense structure of the recycled concrete and high water absorption, which affected the mechanical properties and fluidity properties of the concrete.

Source: AIP Advances

DOI: 10.1063/5.0283910

Authors: Yudong Zhang, Yuhong Huang, Zhenwei Jiang, Yuzhen Li, Yuzeng Gao

Institution: Hebei University of Architecture

Language: English

Topic: Recycled Aggregate Concrete Performance

Subfield: Building and Construction

Field: Engineering

Domain: Physical Sciences

SDG: Responsible consumption and production

Open Access status: gold

Estimated APC paid: $1,350