Influence of the cementitious matrix on the behavior of fiber reinforced concrete

Abstract

One of the main purposes of the addition of fibers to the concrete is the control of the plastic shrinkage cracking in the fresh state and the increase of the post-crack resistance in the hardened state. The cementitious matrix is one of the factors that influences the performance of fiber reinforced concrete, interfering in the fluidity of the mixture and in the adhesion between fiber and matrix. In this context, the present paper evaluates the behavior of two concrete, one of conventional strength and another of high-strength, without fiber and with a content of 1%, by volume, of fiber, being used steel fiber and macro-polymeric fiber. For this, the mechanical properties of the concrete were evaluated in the hardened state by the tests of compressive strength, Barcelona, flexure of prisms and punching of plates. From the experimental results, statistically analyzed, there were significant changes in toughness and residual strength due to change in the cementitious matrix. Finally, an equivalence of performance between the fibers as to the toughness was observed, with the change of the cementitious matrix.

Behavior analysis of high strength concrete containing macro-polymeric fibers based on workability and mechanical properties

“…It was found that macropolymeric fiber can be used to replace steel fiber as long as performance-equivalent fiber contents are considered. Leite and Castro (2020) analyzed the cementitious matrix influence on fiber reinforced concrete behavior, considering mixtures with mean compressive strength of 40 MPa and 70 MPa, produced with steel and macropolymeric fibers. According to the results of the mechanical tests performed in the study, there was no change in the performance pattern of the mixtures reinforced with macro-polymeric fibers when changing the cementitious matrix.…”