Time- and temperature-dependence of compressive and tensile behaviors of polypropylene fiber-reinforced cemented paste backfill

Libos, Iarley Loan Sampaio; Cui, Liang

doi:10.1007/s11709-021-0741-9

Cited by 27 publications

(2 citation statements)

References 53 publications

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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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Section: Introductionmentioning

confidence: 99%

Experimental Study on Direct Tensile Properties of Cemented Paste Backfill

et al. 2022

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“…The majority of the previous research is on the effect of fiber reinforcement on UCS or shear strength of CPB, 18 the findings of which are informative when CPB is assumed to be intact or continuum. Nevertheless, the massive backfill structure contains a large number of randomly distributed defects such as the entrapped air bubbles formed in the mixing process, the capillary pores caused by the cement hydration, and surface notches induced by the rough rock walls.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of fiber content and length on curing time‐dependent mode‐I fracture behavior and properties of cemented paste backfill and implication to engineering design

Fang

Cui

2022

Fatigue Fract Eng Mat Struct

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The inclusion of fiber in cemented paste backfill (CPB) can significantly alter the mechanical response of the CPB body. The intrinsic defects in CPB and the potential dynamic loading condition make it necessary to investigate the fracture properties of fiber-reinforced CPB (FR-CPB). The mode-I fracture behavior and properties are crucial to the successful engineering application of FR-CPB technology used in underground mines. The contribution of fiber length and content to the evolutive mode-I fracture behavior and properties of FR-CPB was examined in this study. The results show that the addition of fiber reduces the prepeak stiffness but improves the mode I fracture toughness (K Ic ), and the improvement in K Ic increases with fiber length. In contrast, the initial increase in fiber content (from 0% to 0.5%) benefits the K Ic acquisition, while a further increase in fiber content from 0.5% to 0.75% poses a negative influence on the K Ic development. Moreover, with the adoption of the cement hydration model, four predictive functions are proposed to describe the contribution of fiber length and content to the development of fracture properties. In addition, K Ic is identified as a more reliable fracture property for assessing the immediate ground support role played by the FR-CPB structure. The findings are helpful when it comes to the determination of the fiber length and content in FR-CPB design. K E Y W O R D Scemented paste backfill, fiber reinforcement, fracture toughness, tailings, underground mine List of abbreviations/symbols: CB, chevron bend; CCNBD, cracked chevron-notched Brazilian disc; FRCC, fiber-reinforced cementitious composites; FR-CPB, fiber-reinforced cemented paste backfill; K IC , mode I fracture toughness; LPD, load-point displacement; NT, natural tailings; PSD, particle size distribution; SCB, semicircular bending test; SR, short rod; ST, silicate tailings; TSF, tailings storage facilities; UCS, uniaxial compressive strength; w /c, water to cement ratio; T, thickness of sample; F l , fiber length; F c , fiber content; F lr , reference fiber length; a, notch length; D, diameter of sample; FM-ITZ, fiber-matrix interfacial transition zone; P, normal force; S, half of the distance between the two supporting rollers; R, radius of sample; k s , stiffness; E i , fracture initiation energy; E m , critical fracture energy; P m , peak force; Y I , stress intensity factor; u, displacement; i, stage number; E p , postpeak fracture energy; ξ f , final degree of cement hydration; ξ, degree of cement hydration; τ, curing time constant; β, shape constant; t e , curing time; T r , reference curing temperature; T c , actual curing temperature; E a , energy activating cement hydration; R', natural gas constant; a i , b i , c i , d i , fitting constants.

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Experimental investigation of evolutive mode-I and mode-II fracture behavior of fiber-reinforced cemented paste backfill: Effect of curing temperature and curing time

Fang

Cui

2023

Front. Struct. Civ. Eng.

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Time- and temperature-dependence of compressive and tensile behaviors of polypropylene fiber-reinforced cemented paste backfill

Cited by 27 publications

References 53 publications

Experimental Study on Direct Tensile Properties of Cemented Paste Backfill

Experimental Study on Direct Tensile Properties of Cemented Paste Backfill

Experimental investigation of fiber content and length on curing time‐dependent mode‐I fracture behavior and properties of cemented paste backfill and implication to engineering design

Experimental investigation of evolutive mode-I and mode-II fracture behavior of fiber-reinforced cemented paste backfill: Effect of curing temperature and curing time

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