Influence of Fibers on High Performance Concretes: Fibers Fabricated in Cameroon

Abstract

In this article, steel fibers (sf) and Alcohol polyvinyl fibers (apvf) are used as addition with the aim to obtain high performances concrete (hpc). Some mechanical properties of high performances concrete containing these materials have been studied through bending and compressive tests on prismatic and cylindrical test tubes. The results showed that the addition of fibers in a formulation of high performances concrete gives results that varies from one solicitation to another and from a type of fiber to another: in the case of the simple compressive strength test, strengths are rather reduced, despite the fact that pieces of test- tube remain sewn after rupture. This is due to the phenomena of multidirectional cracking that appear at the time of the solicitation. The compressive strength decreases more when apvf is used; ii) concerning the bending test, steel fibers improve considerably the strength and the ductility of concretes thanks to their nature and their geometry. This improvement is favored by the compactness of the matrix; iii) there is no interest using apvf to improve the ductility or the strength of the hpc in bending. They rather decrease the resistance to the cracking and the rigidity of the material.