Stress–Strain Relationship Model of Recycled Concrete Based on Strength and Replacement Rate of Recycled Coarse Aggregate

• Published in: Journal of materials in civil engineering 2019-09, Vol.31 (9)
• Main Authors: Peng, Ji-Liang, Du, Ting, Zhao, Ting-Sheng, Song, Xie-qing, Tang, Jing-Jing
• Format: Article
• Language: English
• Subjects: Building materials; Civil engineering; Compression loads; Compressive properties; Compressive strength; Concrete aggregates; Concrete structures; Experiments; Model accuracy; Recycled materials; Strain analysis; Stress-strain curves; Stress-strain relationships; Technical Papers
• ISSN: 0899-1561; 1943-5533
• DOI: 10.1061/(ASCE)MT.1943-5533.0002847

AbstractThe use of recycled coarse aggregate (RCA) can reduce the consumption of natural coarse aggregate (NCA) and preserve the natural environment. The accurate calculation of the compressive stress-strain relationship of recycled aggregate concrete (RAC) is very important in designing the recycled concrete structure. In this paper, experiments on compressive stress-strain based on five strength grades and six replacement rates of RCA from 0 to 60% were designed. The prism specimens of a height-to-width ratio of 3 were used to conduct the experiments under uniaxial compression load. The complete stress-strain curves were obtained by the experiments, and the ascending and descending branches of the experimental stress-strain curves are discussed separately. Based on the experimental results and by introducing the shape parameter β of the stress-strain curve, a theoretical model of the stress-strain relationship considering the strength and replacement rate of recycled coarse aggregate was established. Through comparison and analysis, the stress-strain curve of RAC obtained by the suggested model has good fitting accuracy.