Development of Mode I and Mode II fracture toughness of cemented paste backfill: Experimental results of the effect of mix proportion, temperature and chemistry of the pore water

Fang, Kun; Ren, Lei; Jiang, Haiqiang

doi:10.1016/j.engfracmech.2021.108096

Cited by 19 publications

(4 citation statements)

References 49 publications

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“…The generation of C‐S‐H is formed by the hydration of tricalcium and dicalcium silicate. With the elapse of time, the rising K Ic of fiber‐free CPB is ascribed to the increasing amount of C‐S‐H 27 . In addition to the binding force provided by the C‐S‐H, the improved matric suction (as a result of the pore‐water consumption by cement hydration) and the increased effective stress (caused by the consumption of water by the cement hydration) also contribute to the increase in K Ic 26 .…”

Section: Resultsmentioning

confidence: 99%

“…The generation of C-S-H is formed by the hydration of tricalcium and dicalcium silicate. With the elapse of time, the rising K Ic of fiber-free CPB is ascribed to the increasing amount of C-S-H. 27 In addition to the binding force provided by the C-S-H, the improved matric suction (as a result of the pore-water consumption by cement hydration) and the increased effective stress (caused by the consumption of water by the cement hydration) also contribute to the increase in K Ic . 26 Although the inclusion of fiber places no effect on the cement hydration process, 56 the hardening CPB matrix can gradually enhance the fiber-matrix interaction with curing time and thus improve the fracture toughness.…”

Section: Evolution Of the Notch Fracture Toughness K Ic Of Fr-cpbmentioning

confidence: 99%

“…Moreover, the linear elastic fracture mechanics has been confirmed valid in assessing the fracture performance of CPB. 26 Up to date, several studies 26,27 have been carried out to scrutinize the development of mode I & II fracture toughness of CPB materials under multiphasic conditions. However, no studies have systematically investigated the effect of fiber length and content on the evolutive fracture behavior and properties of FR-CPB under mode-I loading, which prevent a safe and optimum usage of fiber reinforcement in CPB technology.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Evolution Of the Notch Fracture Toughness K Ic Of Fr-cpbmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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“…In backfill mining methods, CTB's poor strength characteristics pose a significant threat to the protection of mine operators and equipment [30]. Many scholars and engineers have so far performed numerous investigations on CTB's toughness improvement [31,32]. The main method to enhance the toughness of CTB materials is to incorporate different additives such as straw [33], rubber [34], fiber [32], sand [35], and others [36,37].…”

Section: Introductionmentioning

confidence: 99%

Polypropylene Fiber Effect on Flexural Strength, Toughness, Deflection, Failure Mode and Microanalysis of Cementitious Backfills under Three-Point Bending Conditions

Zhao,

Cao,

Yilmaz

2023

Minerals

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Cemented tailings backfill (CTB) is continually practiced in a large number of metallic mines for re-filling underground ore extraction areas. Re-filling these areas can boost the security of mining teams during construction. Hence, CTB’s durability/ductility is extremely vital to ensure the safety of the entire mine. In this study, layered-fiber-reinforced CTB (LFR-CTB) was manufactured using polypropylene fiber (PPF) to increase the strength and flexibility of backfilling. The strength and bending features of CTB and LFR-CTB specimens were explored through a three-point bending test and SEM microanalysis. Test findings pointed out that the flexural strength of 14-day-cured CTB specimens without fiber delamination and with cement showed that a tailings ratio of 1:4 was the largest among others. Residual flexural strength of LFR-CTB was greater than those of CTB without fiber delamination. Accumulating fiber delamination effectively improved CTB’s flexural features. CTBs without fiber delamination presented the largest average flexural modulus values. LFR-CTBs presented greater average toughness index values than ordinary CTB specimens. Adding fiber facilitated the progress of CTB’s post-peak rigidity. LFR-CTBs containing high-fiber delamination dimensional height have excellent bending properties. The damage mode of all backfill specimens is chiefly tensile damage. The overall bonding of LFR-CTB specimens in the presence of interlayer interfaces is outstanding, not affecting their bending performance. Ettringite and CSH gels were found to be key hydration materials. The addition of fiber to the filling has an inhibitory impact on the extension of the cracks occurring within specimens. Finally, this study’s key consequence is to deliver a technical guideline and reference in order to reveal LFR-CTB’s enhancement and delamination mechanism for industrial applications.

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Thermo-hydro-mechanical response of cementitious tailings fill to low humidity and ambient temperature interference

Xing,

Wu,

Cheng

et al. 2024

Geotech Geol Eng

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Development of Mode I and Mode II fracture toughness of cemented paste backfill: Experimental results of the effect of mix proportion, temperature and chemistry of the pore water

Cited by 19 publications

References 49 publications

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

Polypropylene Fiber Effect on Flexural Strength, Toughness, Deflection, Failure Mode and Microanalysis of Cementitious Backfills under Three-Point Bending Conditions

Thermo-hydro-mechanical response of cementitious tailings fill to low humidity and ambient temperature interference

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