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Constitutive behaviour of a granular matrix containing coal mine waste intermixed with rubber crumbs
https://orcid.org/http://orcid.org/0000-0002-7689-8115
https://orcid.org/http://orcid.org/0000-0002-9057-1514
https://orcid.org/http://orcid.org/0000-0002-3486-2130
https://orcid.org/http://orcid.org/0000-0002-1317-6297
Traditional railway substructure materials (i.e., natural crushed rock aggregates used for ballast and capping layers) degrade under service loads, incurring higher periodic maintenance costs compared to recycled materials. Using recycled waste materials such as coal wash and rubber crumbs for infrastructure upgrades not only reduces construction and maintenance costs but also supports environmental sustainability. By exploring unconventional avenues, earlier studies have delved into the viability of blending rubber crumbs (RC) and coal wash (CW) as an innovative substitute for traditional railway substructure materials, with a specific focus on the capping layer. This study introduces a semi-empirical constitutive model to simulate the response of mixtures of coal wash and rubber crumbs (CWRC) using the bounding surface plasticity framework. The novelty of this study is that a modified volumetric strain expression is introduced to capture the compressibility of rubber, thus enabling a more accurate representation of the internal deformation of rubber within the granular matrix. The variation of rubber content in the mixture is captured by the corresponding critical state void ratio surface and the hardening modulus. The theoretical model is then calibrated and validated using static drained triaxial test data for CWRC mixtures as well as mixtures of steel furnace slag, coal wash, and rubber crumbs (SFS + CW + RC).
Constitutive behaviour of a granular matrix containing coal mine waste intermixed with rubber crumbs
https://orcid.org/http://orcid.org/0000-0002-7689-8115
https://orcid.org/http://orcid.org/0000-0002-9057-1514
https://orcid.org/http://orcid.org/0000-0002-3486-2130
https://orcid.org/http://orcid.org/0000-0002-1317-6297
Traditional railway substructure materials (i.e., natural crushed rock aggregates used for ballast and capping layers) degrade under service loads, incurring higher periodic maintenance costs compared to recycled materials. Using recycled waste materials such as coal wash and rubber crumbs for infrastructure upgrades not only reduces construction and maintenance costs but also supports environmental sustainability. By exploring unconventional avenues, earlier studies have delved into the viability of blending rubber crumbs (RC) and coal wash (CW) as an innovative substitute for traditional railway substructure materials, with a specific focus on the capping layer. This study introduces a semi-empirical constitutive model to simulate the response of mixtures of coal wash and rubber crumbs (CWRC) using the bounding surface plasticity framework. The novelty of this study is that a modified volumetric strain expression is introduced to capture the compressibility of rubber, thus enabling a more accurate representation of the internal deformation of rubber within the granular matrix. The variation of rubber content in the mixture is captured by the corresponding critical state void ratio surface and the hardening modulus. The theoretical model is then calibrated and validated using static drained triaxial test data for CWRC mixtures as well as mixtures of steel furnace slag, coal wash, and rubber crumbs (SFS + CW + RC).
Constitutive behaviour of a granular matrix containing coal mine waste intermixed with rubber crumbs
https://orcid.org/http://orcid.org/0000-0002-7689-8115
https://orcid.org/http://orcid.org/0000-0002-9057-1514
https://orcid.org/http://orcid.org/0000-0002-3486-2130
https://orcid.org/http://orcid.org/0000-0002-1317-6297
Traditional railway substructure materials (i.e., natural crushed rock aggregates used for ballast and capping layers) degrade under service loads, incurring higher periodic maintenance costs compared to recycled materials. Using recycled waste materials such as coal wash and rubber crumbs for infrastructure upgrades not only reduces construction and maintenance costs but also supports environmental sustainability. By exploring unconventional avenues, earlier studies have delved into the viability of blending rubber crumbs (RC) and coal wash (CW) as an innovative substitute for traditional railway substructure materials, with a specific focus on the capping layer. This study introduces a semi-empirical constitutive model to simulate the response of mixtures of coal wash and rubber crumbs (CWRC) using the bounding surface plasticity framework. The novelty of this study is that a modified volumetric strain expression is introduced to capture the compressibility of rubber, thus enabling a more accurate representation of the internal deformation of rubber within the granular matrix. The variation of rubber content in the mixture is captured by the corresponding critical state void ratio surface and the hardening modulus. The theoretical model is then calibrated and validated using static drained triaxial test data for CWRC mixtures as well as mixtures of steel furnace slag, coal wash, and rubber crumbs (SFS + CW + RC).
Constitutive behaviour of a granular matrix containing coal mine waste intermixed with rubber crumbs
Acta Geotech.
Riyad, A. S. M. (author) / Indraratna, Buddhima (author) / Qi, Yujie (author) / Tawk, Miriam (author)
Acta Geotechnica ; 20 ; 185-196
2025-01-01
12 pages
Article (Journal)
Electronic Resource
English
Bounding surface plasticity , Coal wash (CW) , Constitutive model , Modified volumetric strain , Rubber crumbs (RC) Engineering , Civil Engineering , Geoengineering, Foundations, Hydraulics , Solid Mechanics , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics
Constitutive behaviour of a granular matrix containing coal mine waste intermixed with rubber crumbs
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