TY - JOUR

T1 - New method for determining the Mode-I fracture toughness of shotcrete: edge notched partial disc test

AU - Manesh, Mohammad Omidi

AU - Sarfarazi, Vahab

AU - Babanouri, Nima

AU - Rezaei, Amir

AU - Moayedi Far, Arsham

N1 - Publisher Copyright: © 2023 ICE Publishing. All rights reserved.

PY - 2024/2/19

Y1 - 2024/2/19

N2 - The fracture toughness (mode I) of shotcrete specimens was obtained using edge-notched partial disc (ENPD) specimens. Notched Brazilian discs (NBDs) were also tested to validate the results of the ENPD experiments. Numerical analysis was also conducted on the ENPD results to compare the measured and numerically obtained fracture toughness values. The notch lengths in the ENPD specimens were 15, 30, 45 and 60 mm, while the notch lengths in the NBD specimens were 10, 20, 30, 40, 50 and 60 mm. It was found that the flat joint model accurately predicted the potential crack growth path and crack initiation stress as compared with the experimental results. It was also deduced that the fracture toughness was roughly the same with an increase in the notch length. The tensile strength (σ t) and fracture toughness (K IC) of the shotcrete specimens were found to be meaningfully correlated (σ t = 7.92K IC). The ENPD tests yielded the lowest fracture toughness values because of the pure tensile stress distribution on the failure surface. It was also found that the derived fracture extension patterns from the laboratory investigations were in acceptable agreement with the outputs of numerical simulations.

AB - The fracture toughness (mode I) of shotcrete specimens was obtained using edge-notched partial disc (ENPD) specimens. Notched Brazilian discs (NBDs) were also tested to validate the results of the ENPD experiments. Numerical analysis was also conducted on the ENPD results to compare the measured and numerically obtained fracture toughness values. The notch lengths in the ENPD specimens were 15, 30, 45 and 60 mm, while the notch lengths in the NBD specimens were 10, 20, 30, 40, 50 and 60 mm. It was found that the flat joint model accurately predicted the potential crack growth path and crack initiation stress as compared with the experimental results. It was also deduced that the fracture toughness was roughly the same with an increase in the notch length. The tensile strength (σ t) and fracture toughness (K IC) of the shotcrete specimens were found to be meaningfully correlated (σ t = 7.92K IC). The ENPD tests yielded the lowest fracture toughness values because of the pure tensile stress distribution on the failure surface. It was also found that the derived fracture extension patterns from the laboratory investigations were in acceptable agreement with the outputs of numerical simulations.

KW - Mining & environmental issues

KW - Numerical modeling

KW - Toughness

KW - numerical modelling

KW - mining & environmental issues

KW - toughness

UR - http://www.scopus.com/inward/record.url?scp=85180977752&partnerID=8YFLogxK

U2 - 10.1680/jmacr.23.00004

DO - 10.1680/jmacr.23.00004

M3 - Article

VL - 76.2024

SP - 557

EP - 573

JO - Magazine of concrete research

JF - Magazine of concrete research

SN - 0024-9831

IS - 11

ER -