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Frontiers of Structural and Civil Engineering

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Front. Struct. Civ. Eng.    2023, Vol. 17 Issue (2) : 256-270    https://doi.org/10.1007/s11709-022-0924-z
RESEARCH ARTICLE
Experimental investigation of evolutive mode-I and mode-II fracture behavior of fiber-reinforced cemented paste backfill: Effect of curing temperature and curing time
Kun FANG1,2, Liang CUI2()
1. School of Mines, China University of Mining & Technology, Xuzhou 221116, China
2. Department of Civil Engineering, Lakehead University, Ontario P7B 5E1, Canada
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Abstract

The curing temperature-dependent cement hydration causes the nonlinear evolution of fracture behavior and properties of fiber-reinforced cemented paste backfill (CPB) and thus influences the stability of mine backfill materials in deep mines. Therefore, the coupled effect of curing temperature (20, 35, and 45 °C) and cement hydration at different curing times (3, 7, and 28 d) on the mode-I and mode-II fracture behavior and properties of fiber-reinforced CPB is investigated. A comprehensive experimental testing program consisting of semicircular bend tests, direct shear tests, measurement of volumetric water content and matric suction, TG/DTG tests, and SEM observation is carried out. The results show that the coupled thermochemical effect results in strongly nonlinear development of pre- and post-peak behavior of fiber-reinforced CPB. Moreover, the results discover a positive linear correlation between fracture toughness and shear strength parameters and also reveal the vital role played by matric suction in the formation of fracture toughness. Furthermore, predictive functions are developed to estimate the coupled thermochemical effect on the development of KIc and KIIc. Therefore, the findings and the developed mathematical tools have the potential to promote the successful application of fiber-reinforced CPB technology in deep underground mines.
Keywords fiber reinforcement      cemented paste backfill      fracture behavior      underground mine      cement hydration     
Corresponding Author(s): Liang CUI   
Just Accepted Date: 19 December 2022   Online First Date: 09 March 2023    Issue Date: 03 April 2023
 Cite this article:   
Kun FANG,Liang CUI. Experimental investigation of evolutive mode-I and mode-II fracture behavior of fiber-reinforced cemented paste backfill: Effect of curing temperature and curing time[J]. Front. Struct. Civ. Eng., 2023, 17(2): 256-270.
 URL:  
https://academic.hep.com.cn/fsce/EN/10.1007/s11709-022-0924-z
https://academic.hep.com.cn/fsce/EN/Y2023/V17/I2/256
tensile strength (MPa)modulus of elasticity (GPa)density (g/cm3)elongation at break (%)
5004.20.9180%
Tab.1  Physical properties of PP fibers
Fig.1  CPB specimens for (a) mode-I SCB tests and (b) mode-II SCB tests.
parametermode-I SCB specimensmode-II SCB specimens
thickness of specimen, t (cm)55
radius of specimen, R (cm)55
notch inclination angle, α (° )054
notch length, a (cm)2.52.5
half loading span, S (cm)44
normalized stress intensity factor, YI6.52–
normalized stress intensity factor, YII–1.07
Tab.2  Parameters associated with the determination of notch fracture toughness
Fig.2  Cuboidal specimen for direct shear test.
Fig.3  Schematic diagram of the monitoring program.
Fig.4  Coupled thermochemical effect on force-displacement relation of fiber-reinforced CPB under mode-I loading at (a) 3 d, (b) 7 d, and (c) 28 d.
Fig.5  Coupled thermochemical effect on force-displacement relation of fiber-reinforced CPB under mode-II loading at (a) 3 d, (b) 7 d, and (c) 28 d.
Fig.6  Crack path in SCB specimen under (a) mode-I loading and (b) mode-II loading.
Fig.7  Coupled thermochemical effect on the development of (a) mode-I notch fracture toughness KIc and (b) mode-II notch fracture toughness KIIc of fiber-reinforced CPB.
Fig.8  Microstructure of 7-d fiber-reinforced CPB cured at temperatures of (a) 20 °C, (b) 35 °C, and (c) 45 °C.
Fig.9  The coupled thermochemical effect on the evolution of VWC and matric suction in fiber-reinforced CPB.
Fig.10  Thermal analysis on 3-, 7-, and 28-d specimens.
Fig.11  Evolution of (a) cohesion and (b) friction angle of fiber-reinforced CPB.
Fig.12  Dependency of KIc on (a) cohesion and (b) regularized matric suction.
Fig.13  Dependency of KIIc on (a) cohesion; (b) friction coefficient; and (c) regularized matric suction.
Fig.14  Comparison of measured and predicted notch fracture toughness: (a) KIc and (b) KIIc.
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[1] Iarley Loan Sampaio LIBOS, Liang CUI. Time- and temperature-dependence of compressive and tensile behaviors of polypropylene fiber-reinforced cemented paste backfill[J]. Front. Struct. Civ. Eng., 2021, 15(4): 1025-1037.
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