Effect of Rice Straw on Tensile Properties of Tailings Cemented Paste Backfill

Li, Zeyu; Shi, Xiuzhi; Chen, Xin

doi:10.3390/app12010526

Cited by 7 publications

(3 citation statements)

References 38 publications

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“…They found that the addition of corn stalk fiber increased the mechanical properties of CPB and that the reinforcement effect of corn stalk fiber after alkaline treatment was better. Li et al [27] studied the influence of straw fiber on the tensile properties of CPB. It was found that the addition of straw fiber increased the tensile properties of the CPB, and it was also found that this strengthening effect was weakened when the curing time was increased.…”

Section: Introductionmentioning

confidence: 99%

The Failure Mechanical Properties of Cemented Paste Backfill with Recycled Rubber

Yang

Wang

et al. 2023

Materials

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Understanding the mechanical properties and failure process of cemented paste backfill with recycled rubber (RCPB) is the foundation of backfill design in underground mining. In this study, physical and mechanical tests were conducted on RCPB to obtain its mechanical property parameters, such as its uniaxial compressive strength (UCS), toughness, and peak strain. The influence of the rubber dosage on the mechanical properties of RCPB was also analyzed. In addition, the deformation behavior, fracture development, and failure process of RCPB with different rubber contents were observed using the digital image correlation (DIC) technique. The experimental results suggested that, although the UCS of RCPB is reduced as more rubber is added, its toughness and ability to absorb energy is increased. Moreover, the impact resistance of RCPB is improved by this increased toughness. With the increase in the rubber content, the deformation corresponding to the plastic yield stage of RCPB increased, which resulted in better ductility and improved impact resistance. The failure of the RCPB specimens mainly showed an “X” shape. The results of this study help us to better understand the mechanical behavior of RCPB after backfilling underground.

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Section: Introductionmentioning

confidence: 99%

The Failure Mechanical Properties of Cemented Paste Backfill with Recycled Rubber

Yang

Wang

et al. 2023

Materials

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“…In terms of the tensile strength test of CPB, the splitting test is the most commonly used method (Yilmaz et al, 2009;Deng et al, 2017;Zhang and Zhang, 2020;Libos and Cui, 2021;Li et al, 2022). But many research studies assume that the crack failure begins when the tensile stress reaches a maximum point, and the splitting test is more suitable for brittle materials because they will not turn into plastic deformation before the tensile fracture occurs (Yu et al, 1997;Coviello et al, 2005;Lu et al, 2007;Li and Wong, 2013).…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Direct Tensile Properties of Cemented Paste Backfill

et al. 2022

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Cemented paste backfill (CPB) has been increasingly utilized in mines for efficient mineral obtaining and regional ground support. To guarantee the work performance, the mechanical properties of CPB have long been a topic of study among researchers. But the research progress on the tensile strength of CPB is limited, mainly because of the lack of an appropriate test method due to the low tensile strength of CPB. Therefore, instead of the conventional splitting indirect tensile strength test method, a new direct tension test method, which utilizes the specifically designed compression to tension load converter (CTLC) and dog-bone-shaped specimen, has been applied to study the direct tensile properties of CPB. In this study, the direct tensile strength (DTS) of 47 CPB mix designs were measured using CTLC, and the unconfined compressive strength (UCS) of the corresponding mix design was also tested. The experimental results showed that the increase in the binder content, solid mass content, and curing period led to higher CPB direct tensile strength, and the DTS of CPB was most sensitive to the binder content. Furthermore, the influence of the slurry mass solid content on the tensile strength of CPB was not linear. The influence of the binder content became increasingly notable with the increase in the solid content, especially if the binder content exceeded 75%. The effect of the curing period was found to be rather marginal due to the decreasing amount of un-hydrated cementitious materials left with the increase of the curing period. Overall, the DTS generated using dog-bone specimens and the CTLC apparatus are valid for better mine backfill designs. Finally, a linear correlative between UCS and DTS with a formula in the form of σDT (DTS) = 0.171 σc (UCS) was obtained, and the correlation was sufficient for further calculation of DTS using measured UCS.

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“…Making cemented paste backfill (CPB) from tailings as filling aggregate for underground mining areas is the most commonly used means to treat tailings [ 10 , 11 , 12 , 13 ]. CPB refers to a kind of cement-based material that is set and solidified by mixing dehydrated tailings, cementitious materials, water, etc., in a certain proportion [ 14 , 15 , 16 ]. Filling underground mining areas with CPB by specific methods can not only efficiently treat tailings, it also helps to reduce surface subsidence, improve the underground environment of mining operations, and enhance ore recovery [ 17 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

A Novel Design Concept of Cemented Paste Backfill (CPB) Materials: Biobjective Optimization Approach by Applying an Evolved Random Forest Model

He¹,

Cheng

et al. 2022

Materials

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For cemented paste backfill (CPB), uniaxial compressive strength (UCS) is the key to ensuring the safety of stope construction, and its cost is an important part of the mining cost. However, there are a lack of design methods based on UCS and cost optimization. To address such issues, this study proposes a biobjective optimization approach by applying a novel evolved random forest (RF) model. First, the evolved RF model, based on the beetle search algorithm (BAS), was constructed to predict the UCS of CPB. The consistency between the predicted value and the actual value is high, which proves that the hybrid machine learning model has a good effect on the prediction of the UCS of CPB. Then, considering the linear relationship between the costs and the components of CPB, a mathematical model of the cost is constructed. Finally, based on the weighted sum method, the biobjective optimization process of the UCS and cost of CPB is conducted; the Pareto front optimal solutions of UCS and the cost of CPB can be obtained by the sort of solution set. When the UCS or the cost of CPB is constant, the Pareto front optimal solutions can always have a lower cost or a higher UCS compared with the actual dataset, which proves that the biobjective optimization approach has a good effect.

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Effect of Rice Straw on Tensile Properties of Tailings Cemented Paste Backfill

Cited by 7 publications

References 38 publications

The Failure Mechanical Properties of Cemented Paste Backfill with Recycled Rubber

The Failure Mechanical Properties of Cemented Paste Backfill with Recycled Rubber

Experimental Study on Direct Tensile Properties of Cemented Paste Backfill

A Novel Design Concept of Cemented Paste Backfill (CPB) Materials: Biobjective Optimization Approach by Applying an Evolved Random Forest Model

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