Repeated impact behavior of preplaced aggregate concrete incorporating different fiber types

• Published in: Materials today : proceedings 2023-09
• Main Authors: Murali, G., Abid, Sallal R., Ranjan, Rajiv, Khera, Gurbir Singh, Ramesh, G., Dixit, Saurav
• Format: Article
• Language: English
• Subjects: Drop-weight; Polypropylene fibers; Preplaced aggregate concrete; Steel fibers
• ISSN: 2214-7853; 2214-7853
• DOI: 10.1016/j.matpr.2023.09.117

This research used an experimental approach to examine the impact performance of preplaced fibrous aggregate concrete with various fibre types. Four concrete mixtures were produced with identical quantities except for the type of fiber. The first reference mixture was plain, while the other mixtures were reinforced with 2.5% of polypropylene fibers (PP), short steel fibers (SF1) and long steel fibers (SF2). In accordance with the ACI 544-2R impact test method, six cylindrical discswere tested from each mixture using drop-weight impact loading. The tests' results revealed that adding fibre, irrespective of the type of fiber used, considerably enhanced the impact strength at the cracking (Ncr) and failure (Nf) phases. Compared to their plain concrete specimens, fibrous specimens showed increased Ncr ranging from 395 to 655% and Nf from 727 to 1973%. Steel fibers exhibited higher impact strength by 33 to 151% and higher ductility by 44 to 64% compared to PP fibers. Besides, a longer steel fiber performed better under impact loads than shorter steel fibers, where Ncr and Nf were higher by 14 and 31%, respectively.