An experimental study on the mechanical properties of underground mining backfill materials obtained from recycling of construction and demolition waste

Khandani, Faeze Sadat; Atapour, Hashem; Rad, Mostafa Yousefi; Khosh, Behzad

doi:10.1016/j.cscm.2023.e02046

Cited by 10 publications

(4 citation statements)

References 69 publications

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“…Incorporating CDW into underground backfilling could sustainably reduce waste volumes and environmental impacts compared to conventional methods [90,91]. Recent studies have demonstrated the technical feasibility of partial CDW substitution in CPB mixtures through case studies in countries such as Turkey [92,93], Australia [94], and Iran [95]. These studies have shown that the long-term strength and durability of CPB mixtures containing CDW are comparable or even better than those prepared with only tailings.…”

Section: Use Of Construction and Demolition Waste As Refilling Materi...mentioning

confidence: 99%

The Potential of Recycling and Reusing Waste Materials in Underground Construction: A Review of Sustainable Practices and Challenges

Sharghi,

Jeong

2024

Sustainability

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Underground infrastructure projects pose significant environmental risks due to resource consumption, ground stability issues, and potential ecological damage. This review explores sustainable practices for mitigating these impacts throughout the lifecycle of underground construction projects, focusing on recycling and reusing excavated tunnel materials. This review systematically analyzed a wide array of sustainable practices, including on-site reuse of excavated tunnel material as backfill, grouting, soil conditioning, and concrete production. Off-site reuses explored are road bases, refilling works, value-added materials, like aggregates and construction products, vegetation reclamation, and landscaping. Opportunities to recover and repurpose tunnel components like temporary support structures, known as “false linings”, are also reviewed. Furthermore, the potential for utilizing industrial and construction wastes in underground works are explored, such as for thermal insulation, fire protection, grouting, and tunnel lining. Incorporating green materials and energy-efficient methods in areas like grouting, lighting, and lining are also discussed. Through comprehensive analysis of numerous case studies, this review demonstrates that with optimized planning, treatment techniques, and end-use selection informed by material characterization, sustainable practices can significantly reduce the environmental footprint of underground infrastructure. However, certain approaches require further refinement and standardization, particularly in areas like the consistent assessment of recycled material properties and the development of standardized guidelines for their use in various applications. These practices contribute to broader sustainability goals by reducing resource consumption, minimizing waste generation, and promoting the use of recycled and green materials. Achieving coordinated multi-stakeholder adoption, including collaboration between contractors, suppliers, regulatory bodies, and research institutions, is crucial for maximizing the impact of these practices and accelerating the transition towards a more sustainable underground construction industry.

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Section: Use Of Construction and Demolition Waste As Refilling Materi...mentioning

confidence: 99%

The Potential of Recycling and Reusing Waste Materials in Underground Construction: A Review of Sustainable Practices and Challenges

Sharghi,

Jeong

2024

Sustainability

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“…Hidalgo [16] et al investigated the improvement of roadbeds by mixing C&DW with soil, reducing the increment of the thickness of the pavement structure. Khandani [17] et al evaluated the possibility of backfilling underground openings of mines with C&DW as a solidified reclaimed aggregate material by performing various tests, considering their physical and mechanical properties. Ronaldo [18] et al studied the replacement of natural aggregate by recycled aggregate to make recycled concrete piles for soft ground treatment.…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of Cement Fly-ash Gravel piles of recycled construction and demolition waste aggregates under erosion conditions

Zhang,

Yu,

Zhang

et al. 2024

Preprint

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Construction and demolition waste (C&DW) has been mainly used in the field of building materials and road engineering, but relatively few applications in soft soil foundation treatment. This study was aimed to the performance evaluation of the Cement Fly-ash Gravel (CFG) piles using recycled C&DW aggregates in soft ground foundations in inland saline areas, in coasts with high water content and rich in a large number of erosive salt ions. In this paper, erosion experiment simulation conditions were set, the test object was recycled aggregate CFG piles, and the control group was modified aggregate CFG piles and natural aggregate CFG piles under the same conditions. Through the compressive strength test and water absorption test on the pile specimens under different erosion conditions, the changes in the strength and water content of the piles before and after the erosion were obtained. The prediction formulae of water absorption and compressive strength of the piles in the submerged environment and the compressive strength of the piles in the salt-ionized environment were proposed, which reveal the performance deterioration of the recycled aggregate CFG piles. The experimental results showed that the water absorption rate of CFG piles with recycled aggregate under long-term water immersion conditions firstly increased and then tended to stabilize with the immersion time. The change of its compressive strength firstly increased and then declined and finally tended to stabilize. The change of the compressive strength gradually decreased with the salt ion concentration under the salt ion erosion environment.

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“…Gao [7] utilized industrial graphene oxide (GO) and fly ash (FA) to create a high-performance, low-cost, and environment-friendly material for backfill. Sadat [8] discussed the possibility of utilizing the construction and demolition waste (CDW) as cemented recycled aggregate backfill (CRAB) materials in the underground mining industry. Yang [9] revealed the influence of curing age on the dynamic mechanical properties and deformation and failure characteristics of backfill materials under intermediate strain rate.…”

Section: Introductionmentioning

confidence: 99%

Study on Bingham fractional damage model of backfill material under different moisture content conditions

Wang,

Yang,

et al. 2024

PLoS ONE

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Filling mining technology is an important representative technology to realize green and low-carbon mining. The backfill materials have distinct rheological characteristics under the long-term action of formation loads and groundwater seepage. In order to study the creep characteristics of backfill materials under different moisture contents and reveal their aging-mechanical properties, based on the Riemann-Liouville fractional calculus and damage mechanics theory, the fractional element and damage variables are introduced to improve the traditional Bingham model, and the fractional Bingham creep damage model is proposed. Based on the experimental data of gangue cemented backfill under different moisture content, the parameters of the creep model are obtained by using user-defined function fitting and the least square method. The results show that the improved Bingham fractional creep damage model can describe the whole creep process of backfill materials under different moisture contents, and the rationality of the model is verified. Compared with the traditional Bingham model, the fitting degree of the Bingham fractional creep damage model is higher, which solves the problem that the traditional Bingham model cannot describe the nonlinear creep stage. Model parameter α and ξ increase with the increase of axial stress and moisture content. Under the same moisture content, η gradually increases with the increase of axial stress. This work has a certain reference significance for studying the mechanical properties and creep constitutive model of backfill materials containing water.

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An experimental study on the mechanical properties of underground mining backfill materials obtained from recycling of construction and demolition waste

Cited by 10 publications

References 69 publications

The Potential of Recycling and Reusing Waste Materials in Underground Construction: A Review of Sustainable Practices and Challenges

The Potential of Recycling and Reusing Waste Materials in Underground Construction: A Review of Sustainable Practices and Challenges

Performance evaluation of Cement Fly-ash Gravel piles of recycled construction and demolition waste aggregates under erosion conditions

Study on Bingham fractional damage model of backfill material under different moisture content conditions

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