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

Mohammad Omidi Manesh, Vahab Sarfarazi, Nima Babanouri, Amir Rezaei, Arsham Moayedi Far

Publikation: Beitrag in FachzeitschriftArtikelForschungBegutachtung

Abstract

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.
OriginalspracheEnglisch
Seiten (von - bis)557-573
Seitenumfang17
FachzeitschriftMagazine of concrete research
Jahrgang76.2024
Ausgabenummer11
DOIs
PublikationsstatusElektronische Veröffentlichung vor Drucklegung. - 19 Feb. 2024

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