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 - Fracture toughness (first mode) of shotcrete samples was obtained employing Edge Notched Partial Disc (ENPD) type specimens. Notched Brazilian Discs (NBD) were also used in order to validate the results of the conducted ENPD experiments. Moreover, a numerical analysis was conducted on the ENPD tests to verify the correctness of the measured fracture toughness values compared to numerically obtain ones. Notch lengths in ENPD were set to 15, 30, 45 and 60 mm. However, the lengths of Notches in NBD were set to 10, 20, 30, 40, 50 and 60 mm. The findings reveal that the flat joint model could accurately determine the potential crack growth path and crack initiation stress compared to experimentally obtained results. It was also deduced that the fracture toughness remained roughly the same by enlarging the length of the notch. Moreover, tensile strength and fracture toughness of shotcrete samples are meaningfully correlated (σt =7.92 KIC). ENPD test yields the lowest fracture toughness because of pure tensile stress distribution on failure surface. It also was also determined that the derived fracture extension patterns from the laboratory investigations are in an acceptable agreement with the numerical simulations’ outputs.

AB - Fracture toughness (first mode) of shotcrete samples was obtained employing Edge Notched Partial Disc (ENPD) type specimens. Notched Brazilian Discs (NBD) were also used in order to validate the results of the conducted ENPD experiments. Moreover, a numerical analysis was conducted on the ENPD tests to verify the correctness of the measured fracture toughness values compared to numerically obtain ones. Notch lengths in ENPD were set to 15, 30, 45 and 60 mm. However, the lengths of Notches in NBD were set to 10, 20, 30, 40, 50 and 60 mm. The findings reveal that the flat joint model could accurately determine the potential crack growth path and crack initiation stress compared to experimentally obtained results. It was also deduced that the fracture toughness remained roughly the same by enlarging the length of the notch. Moreover, tensile strength and fracture toughness of shotcrete samples are meaningfully correlated (σt =7.92 KIC). ENPD test yields the lowest fracture toughness because of pure tensile stress distribution on failure surface. It also was also determined that the derived fracture extension patterns from the laboratory investigations are in an acceptable agreement with the numerical simulations’ outputs.

KW - Mining & environmental issues

KW - Numerical modeling

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 - ??? Stand: 23. Februar 2024

JO - Magazine of concrete research

JF - Magazine of concrete research

SN - 0024-9831

IS - ??? Stand: 23. Februar 2024

ER -