Active roof-contact: The future development of cemented paste backfill

Yin, Shenghua; Yan, Zepeng; Chen, Xun; Yan, Rongfu; Chen, Dapeng; Li, Gongcheng

doi:10.1016/j.conbuildmat.2023.130657

Cited by 30 publications

(5 citation statements)

References 85 publications

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“…Although the traditional CTB product is a green fill type made from process tailings (principal backfill aggregate), cement, additives, and mixing water [26][27][28], it inevitably shows some limitations covering poor strengths and toughness [29], easy cracking [30], and roof collapse [31] when fills are subjected to ground stress and seismic/blasting activity [32]. To end these problems, fiber-oriented fill applications began to be employed recurrently in mining industries [33,34], although they have frequent use in the field of civil engineering [35].…”

Section: Introductionmentioning

confidence: 99%

Polypropylene Fiber’s Effect on the Features of Combined Cement-Based Tailing Backfill: Micro- and Macroscopic Aspects

Li,

Cao,

Yilmaz

2024

Minerals

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In undercut-and-fill mining, backfills show weak tensile strength and poor ductility properties since they act as artificial pillars to support stope roofs. Hence, the enhancement of the stability of mining structures and backfills is a crucial requisite for underground mining backfill operations. This study addresses the reinforcing effect of polypropylene (PP) on the strength features of combined cement-based tailing backfill (CCTB) with varied cement/tail ratios (c/t: 1:8 to 1:4) at both macroscopic and microscopic levels. Fill specimens containing a fixed solid content of 70 wt% were reinforced with fiber (0.6 wt%) and with no fiber (classified as a reference sample). They were then cast in mold sizes of 160 × 40 × 40 mm3, and cured for 7 days. Following curing, some experiments covering three-point bending assisted by DIC and SEM were performed to inspect the microstructure and strength features of CCTB. The results illustrate that the flexural strength of fiber-oriented CCTB increases along with the c/t fraction, but it is not greater than that of specimens with a high c/t fraction without fiber. Adding PP fiber, the peak deflection of CCTB specimens was improved, and the increment of peak deflection increased linearly with rising c/t fraction, enhancing CCTB’s bending characteristics. CCTB damage starts from the bottom to the middle, and the main cause of the damage is the stress distribution at the lowest section. The addition of fiber to CCTBs increases the ability to dissipate energy, which helps to hinder crack extension and prevent brittle damage from occurring. The microstructure shows that AFt and CSH were key hydrate materials in CCTB. As a result, this study develops the security of mining with backfill and helps to determine its design properties for safe production inputs and sustainable filling operations.

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Section: Introductionmentioning

confidence: 99%

Polypropylene Fiber’s Effect on the Features of Combined Cement-Based Tailing Backfill: Micro- and Macroscopic Aspects

Li,

Cao,

Yilmaz

2024

Minerals

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“…A large number of solid wastes not only occupy ground resources, but also cause environmental pollution. Utilizing coal mine solid waste to prepare low-cost underground backfill materials is an essential approach to immediately address these issues [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Hydrophobic Alteration of Mining Solid Waste Backfill Material

Zhao,

Ma,

Ngo

et al. 2024

Minerals

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To address the issues of corrosion weakening of solid-waste-based backfill material caused by mine water, a novel hydrophobic solid waste backfill (HSBF) material was developed using polydimethylsiloxane (PDMS) and a silane coupling agent (SCA) as hydrophobic modification additives, and NaOH (SH) and sodium silicate (SS) as alkali activators. Fly ash and slag were chosen as the primary raw solid waste materials. The rheological properties of the hydrophobic-treated backfill slurries were measured, and the resulting physicochemical properties were compared with the unmodified reference group. This study reveals that the fresh HSBF slurry follows a Modified Bingham (M-B) model with shear-thinning characteristics. The addition of PDMS causes an increase in the water contact angle of the hardened HSBF material with F8S2 to up to 134.9°, indicating high hydrophobicity. Morphological observations indicated that PDMS mainly attaches to the inorganic particles’ surface through the bridging action of SCA for the hydrophobic modification of the backfill material. The overall strength of the HSBF materials was further ensured via fly ash–slag ratio optimization, and was found to be enhanced up to 98% by increasing slag content from 20% to 50%. This is mainly attributed to the hydration of slag, forming C-S(A)-H gel, which contributes to the increased strength. The novel HSBF material enables the elimination of cement in mine backfilling applications, demonstrating good economic benefits. Its excellent mechanical and hydrophobic properties can not only prevent overburden displacement in goaf areas, but can also mitigate water resource loss from overlying strata and simultaneously reduce the safety risks associated with long-term mine water deterioration.

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“…The filling of underground mine stopes with mine tailings requires an adequate design and rigorous operation [52]. The filling must occur under controlled safety conditions to avoid failures or accidents inside the underground mine [53]. Some of the aspects that must be considered are the following: (i) Geometry of the stope, (ii) Heat generation, (iii) Consolidation by own weight, (iv) Interaction of chemical components of the mine tailings, (v) Rheology of mine tailings, (vi) Interfacial interaction, (vii) Stability conditions of the stope walls, (viii) Stress distribution, (ix) Behavior of dynamic loads, (x) Loads in plugs or barricades, in accordance with what is indicated in Figure 7.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

“…Some of the aspects that must be considered are the following: (i) Geometry of the stope, (ii) Heat generation, The filling of underground mine stopes with mine tailings requires an adequate design and rigorous operation [52]. The filling must occur under controlled safety conditions to avoid failures or accidents inside the underground mine [53]. Some of the aspects that must be considered are the following: (i) Geometry of the stope, (ii) Heat generation, Underground mine fills can be grouped into two general categories: non-cemented, which includes hydraulic and mineral paste fills, and cemented mine fills, which include the addition of binding agents such as Portland cement or Portland cement mixtures along with other pozzolanic additions, fly ash, gypsum, or slag [54,55].…”

mentioning

confidence: 99%

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Experiences of Underground Mine Backfilling Using Mine Tailings Developed in the Andean Region of Peru: A Green Mining Solution to Reduce Socio-Environmental Impacts

Cacciuttolo,

Marinovic

2023

Sustainability

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In Peru, socio-environmental conflicts related to the development of mining-metallurgical processes and the responsible disposal of mine tailings have become central issues for accepting mining projects, especially regarding building relationships of trust with the communities. This condition has prompted the Peruvian mining industry to advance in managing alternatives to the conventional surface disposal of mine tailings. A promising and increasingly popular management strategy for mine tailings in Peru is their disposal inside underground mines. This article presents: site-specific conditions, advantages/disadvantages, and lessons learned from practical experiences of mine tailings disposal in underground mines in Peru. In addition, some techniques are highlighted, such as (i) hydraulic fill, (ii) cemented hydraulic fill, and (iii) cemented paste backfill. Finally, this article concludes that the responsible disposal of mine tailings in underground mines is a green mining solution that reduces negative socio-environmental impacts, limiting the generation of acid rock drainage (ARD) and the leaching of metals due to the decrease in contact with oxygen and rainfall, thus mitigating the contamination of surface and underground waters, reducing the footprint of affectation in the territory, and eliminating the emission of particulate matter in the environment.

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Active roof-contact: The future development of cemented paste backfill

Cited by 30 publications

References 85 publications

Polypropylene Fiber’s Effect on the Features of Combined Cement-Based Tailing Backfill: Micro- and Macroscopic Aspects

Polypropylene Fiber’s Effect on the Features of Combined Cement-Based Tailing Backfill: Micro- and Macroscopic Aspects

Experimental Investigation on Hydrophobic Alteration of Mining Solid Waste Backfill Material

Experiences of Underground Mine Backfilling Using Mine Tailings Developed in the Andean Region of Peru: A Green Mining Solution to Reduce Socio-Environmental Impacts

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