Title:
Optimized Slant Shear Interface Between Steel Fiber Concretes (Prepublished)
Author(s):
Aaron Nzambi, Victória Seixas, and Dênio Oliveira
Publication:
Structural Journal
Volume:
Issue:
Appears on pages(s):
Keywords:
geopolymer concrete; interface; shear strength; slant shear; steel fiber
DOI:
10.14359/51749306
Date:
11/6/2025
Abstract:
This study investigated the shear bond behavior, with and without optimized interfaces, between conventional and geopolymer steel fiber–reinforced concretes. Sixteen prismatic and eight cylindrical composite specimens were cast with interface inclination angles of 45° and 27°, respectively. In prisms, the inclined interface area was varied: eight were optimized by 50% to balance compressive and shear stresses, allowing a more accurate determination of cohesion and friction coefficients under steel fiber effects. Fiber volume fractions of 0.0, 0.5, 1.0, and 1.5% were tested, and the influence of epoxy at the interface was also assessed. Optimized prisms exhibited adhesive failure along the interface, matching the internal friction angle, whereas non-optimized prisms showed cohesive failure with a friction angle deviating from the interface. Increasing fiber content improved performance, especially when combined with epoxy. A new bond shear strength model is proposed, incorporating friction, cohesion, and fiber effects.