An experimental research carried out at the Department of Structural Engineering of the University of Cagliari (Italy) concerning 13 self-compacting concretes has shown that it is possible to keep the workability of SCC unaltered even after adding polymeric fibers (HPF-SCC). The mixes contain fly ash (PFA), Polypropylene (pp) fibers and different cement types. By using pp fibers in SCC, advantages in workability and ductility are obtained, with the plus that pp fibers – being chemically inert as all polymeric fibers – have superior properties against corrosion. The results of this project show that pp fibers improve the mechanical performance of SCC, because of the very good bond between the fibers and the cementitious matrix. The results of the 4-point bending tests (2 per each mix) are presented and discussed in this paper, with reference to concrete first-cracking strength and ductility (indicators D0 and D1). All tests were performed in compliance with the Italian UNI 11039 Standard, that refers to traditional concrete reinforced with metallic fibers, adapted to self-compacting concrete reinforced with pp fibers.
First Cracking Strength and Ductility of SCC reinforced with Polypropylene Fibers
PANI, LUISA;DE NICOLO, BARBARA
2009-01-01
Abstract
An experimental research carried out at the Department of Structural Engineering of the University of Cagliari (Italy) concerning 13 self-compacting concretes has shown that it is possible to keep the workability of SCC unaltered even after adding polymeric fibers (HPF-SCC). The mixes contain fly ash (PFA), Polypropylene (pp) fibers and different cement types. By using pp fibers in SCC, advantages in workability and ductility are obtained, with the plus that pp fibers – being chemically inert as all polymeric fibers – have superior properties against corrosion. The results of this project show that pp fibers improve the mechanical performance of SCC, because of the very good bond between the fibers and the cementitious matrix. The results of the 4-point bending tests (2 per each mix) are presented and discussed in this paper, with reference to concrete first-cracking strength and ductility (indicators D0 and D1). All tests were performed in compliance with the Italian UNI 11039 Standard, that refers to traditional concrete reinforced with metallic fibers, adapted to self-compacting concrete reinforced with pp fibers.
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