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Cemented Mine Waste Backfill: Rheological and Mechanical Property
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Cemented Mine Waste Backfill: Rheological and Mechanical Property

A special issue of Sustainability (ISSN 2071-1050). This special issue belongs to the section "Waste and Recycling".

Deadline for manuscript submissions: closed (31 October 2023) | Viewed by 2879

Special Issue Editors

Dr. Kun Fang

E-Mail Website
Guest Editor
School of Mines, China University of Mining and Technology, Xuzhou 221116, China
Interests: cemented paste backfill; solid backfill mining; mine waste management; rock mechanics; fracture mechanics
Dr. Haiqiang Jiang

E-Mail Website
Guest Editor
Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, Northeastern University, Shenyang 110819, China
Interests: cemented tailings backfill; alternative binder for mine backfill; mine waste management; recycling and utilization of mine waste
Special Issues, Collections and Topics in MDPI journals
Dr. Yun Zhang

E-Mail Website
Guest Editor
School of Energy Science and Engineering, Xi'an University of Science & Technology, Xi'an 710054, China
Interests: solid backfill mining technology; preserved-water mining; fracture mechanics
Dr. Sada Haruna

E-Mail Website
Guest Editor
Civil Engineering Department, University of Ottawa, Ottawa, ON K1N 6N5, Canada
Interests: mine waste management; cemented paste backfill; engineered barrier system for deep geological repositories; expansive soils improvement

Special Issue Information

Dear Colleagues,

This special Issue’s primary objective is to include contributions that will optimize the design of the cemented mine waste backfill from two perspectives, namely in terms of the rheological and mechanical properties.

From the preparation of a cemented backfilling body at the ground surface to the transportation and curing of the backfilling body underground, many processes are involved. The point is how to deliver the prepared backfilling body to underground cavities and make sure its short-/long-term strength is strong enough to support the underground structures with the least cost. With the hope of decreasing the investment cost, many investigations were dedicated to the investigation of the effect of additives on the improvement of the rheological and mechanical properties. This can reduce the amount of cement used during the preparation while still satisfying the strength requirement in the long run.

Investigations on other properties of the cemented backfilling body are also expected and welcomed.

We look forward to receiving your contributions.

Dr. Kun Fang
Dr. Haiqiang Jiang
Dr. Yun Zhang
Dr. Sada Haruna
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Sustainability is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • cemented mine waste backfill
  • additives
  • rheological and mechanical properties

Published Papers (2 papers)

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Research

15 pages, 2697 KiB  
Article
The Influence of Curing Temperature on the Mechanical Properties of Cement-Reinforced Sensitive Marine Clay in Column Experiments
by Shaoping Huang, Ruiming Xing, Chang Zhou, Qian Chen, Chong Hu and Wenying Cao
Sustainability 2023, 15(15), 11514; https://doi.org/10.3390/su151511514 - 25 Jul 2023
Viewed by 767
Abstract
The understanding of the mechanical properties of sensitive marine clay subgrade stabilized with cement is vital for the safe, economical, and durable design of road structures. As the curing temperature affects the cement hydration progress, it is necessary to investigate the influence of [...] Read more.
The understanding of the mechanical properties of sensitive marine clay subgrade stabilized with cement is vital for the safe, economical, and durable design of road structures. As the curing temperature affects the cement hydration progress, it is necessary to investigate the influence of the temperature on the evolution of the mechanical properties of cement-reinforced marine clay in road construction. A column testing and relevant monitoring program were performed to study the effect of various curing temperatures (2 °C, 22 °C, and 40 °C) on the mechanical properties’ development of cement-reinforced clay within 28 days. After these cement clay samples were cured for a specific time (1, 3, 7, and 28 days), they were subjected to two mechanical tests (i.e., California Bearing Ratio (CBR) test and uniaxial compressive strength (UCS) test). The findings reveal that a higher curing temperature accelerates cement hydration and self-desiccation. Consequently, the UCS and CBR values increase with curing temperature and the strength might vary by more times, especially for early age (≤7 days) samples. The results of this study contribute to a deeper understanding of the influence of temperature on the mechanical properties of the cement-reinforced clay and thus provide practical guidance with regards to road construction in the field. Full article
(This article belongs to the Special Issue Cemented Mine Waste Backfill: Rheological and Mechanical Property)
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13 pages, 3142 KiB  
Article
Effect of CO2 Mineralization on the Composition of Alkali-Activated Backfill Material with Different Coal-Based Solid Wastes
by Binbin Huo, Jixiong Zhang, Meng Li, Nan Zhou, Xincai Qiu, Kun Fang and Xiao Wang
Sustainability 2023, 15(6), 4933; https://doi.org/10.3390/su15064933 - 10 Mar 2023
Cited by 2 | Viewed by 1447
Abstract
Research focusing on waste management and CO2 mineralization simultaneously has been a popular topic in the mining community, and a common approach is to mineralize CO2 with coal-based solid waste (CSW, e.g., gangue (CG), fly ash (FA), coal gasification slag (CGS)) [...] Read more.
Research focusing on waste management and CO2 mineralization simultaneously has been a popular topic in the mining community, and a common approach is to mineralize CO2 with coal-based solid waste (CSW, e.g., gangue (CG), fly ash (FA), coal gasification slag (CGS)) produced by mining activities. Despite the understanding of CO2 mineralization by cementitious materials, the mineralization capacity of alkali-activated CSWs remains unknown. Therefore, the mineral composition evolution and mineralization capacity of different alkali-activated materials (prepared with CG, FA, CGS, and sodium hydroxide (which works as the alkali-activator), respectively) are investigated with the adoption of Gibbs Energy Minimization Software (GEMS). The results indicate that the abovementioned three alkali-activated CSWs are majorly composed of calcium silicate hydrate, magnesium silicate hydrate, kaolinite, sodium zeolite, and liquid. Due to the difference in the chemical composition of different CSWs, the amount of hydration products varies. Specifically, the alkali-activated CSWs made with CGS have the maximum calcium silicate hydrate (C-S-H), while those prepared with FA enjoy the lowest porosity. In addition, the CO2 mineralization process will result in the formulation of carbonate and, theoretically, the maximum quantity of mineralized CO2 is less than 20% of the binder used. Furthermore, compared with CG and CGS, FA is characterized with the highest mineralization capacity. The findings in this study contribute to the understanding of CO2 mineralization with alkali-activated CSWs. Full article
(This article belongs to the Special Issue Cemented Mine Waste Backfill: Rheological and Mechanical Property)
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