An experimental study on the shear behaviour of recycled concrete aggregate incorporating recycled tyre waste. (20th December 2020)

• Record Type: Journal Article
• Authors: Saberian, Mohammad; Li, Jie; Perera, Salpadoru Tholkamudalige Anupiya. M.; Ren, Gang; Roychand, Rajeev; Tokhi, Hamayon
• Is Part Of: Construction & building materials. Volume 264(2021)
• Publication Date: 2020-12-20
• Subjects: RCA recycled concrete aggregate -- CR crumb rubber -- S rubber size -- LDST large direct shear test -- τunreinforcedτmax internal shear strength of RCA -- τreinforcedτmax shear strength of RCA-rubber -- σn normal stress -- α shear strength coefficient -- c apparent cohesion -- ϕ internal friction angle -- µα mean value of shear strength coefficient -- σα standard deviation of shear strength coefficient -- γ, , and = regression coefficients -- R2 coefficient of determination; Large-scale direct shear test -- Shear strength -- Recycled concrete aggregate -- Crumb rubber -- Pavement base/subbase; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2020.120266
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: A large-scale direct shear test apparatus was used to evaluate the shear behaviour. The effects of rubber content, rubber size and normal stress were studied. An addition of crumb rubber resulted in an increase of cohesion. The coarse crumb rubber resulted in a higher cohesion than the fine crumb rubber. The rubberized RCA met the shear strength requirements of pavement base/subbase. A simple and practical model was proposed for the estimation of the shear strength. Abstract: Very limited research has been conducted to examine the shear behaviour of blended recycled waste materials using the large direct shear testing apparatus. In this study, a series of large-scale direct shear test (LDST) was undertaken to evaluate the effect of different sizes and different amounts of recycled tyre waste on the shear strength properties of recycled concrete aggregate (RCA) mixed with crumb rubber as pavement base/subbase application. The results of LDST indicated that RCA mixed with two different sizes (i.e., fine and coarse rubber) and three different percentages (i.e., 0.5%, 1% and 2%) of crumb rubber satisfied the shear strength requirements for use in pavement base/subbase applications. The introduction of both fine and coarse crumb rubber led to an increase in the apparent cohesion of RCA/rubber blends. However, beyond 0.5%, increasing the content of crumb rubber resulted in a decrease in the apparent cohesion. Based on the results of the laboratory testing undertaken in this research, a rational and useful model was proposed to estimate the shear strength parameters of RCA incorporating crumb rubber.