Renata Lorenzoni (1), Matheus Tinoco (2), Sidnei Paciornik (1), Flavio de Andrade Silva (2)
Journal of Building Engineering, 43, August 2021. DOI: 10.1016/j.jobe.2021.103126

Keywords

Strain hardening cementitious composites; Hybrid reinforcements; Shear behavior; microCT analysis; Pores distribution; Fibers orientation

Abstract

This paper presents an experimental investigation on the shear response of strain-hardening cement-based composites (SHCC) using X-Ray microtomography (microCT). For the developed composites, PVA and micro steel fibers were used in a constant fiber volume fraction of 2.0 %. The hybrid composites were produced replacing PVA by steel fibers in 25 %, 50 % and 75 % fractions. The shear behavior of the composites was studied by performing Iosipescu shear tests. The crack pattern evolution along the tests and the displacement field in the notch region were analyzed using the Digital Image Correlation (DIC) technique. Information about the porosity, fiber distribution and alignment were obtained using microCT for each specimen tested. The results show that the hybridization increases the crack opening but has little effect on the shear strength. The results also show that PVA fibers affect the alignment of the steel fibers and increase the porosity of the composites.

How Our Software Was Used

Dragonfly was used to carry out fiber orientation measurements.

Author Affiliation

(1) Department of Chemical and Materials Engineering, Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro – RJ, Brazil.
(2) Department of Civil and Environmental Engineering, Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro – RJ, Brazil.