Influence of steel fiber on residual resistance to flexion traction obtained by Rilem TC 162-TDF (2002)

Abstract

ABSTRACT: The characterization of tensile steel fiber reinforced parts can be performed by direct tensile tests, diametral compression or flexural tests. With regard to flexural tests, the RILEM TC 162-TDF (2002), in addition to describing the procedures for performing this test, also evaluates the tensile behavior in terms of load x displacement and load x CMOD curves (Crack Mouth Opening Displacement). The present study stresses to study the residual tensile strengths in flexion (). In this context, a database of 46 flexural tests on three notched prisms points will be collected from the literature. It will be presented and evaluated through a statistical study so that proposals can be established to estimate residual flexural tensile strengths. (i = 1, 2, 3 and 4). In addition, the ability of these proposals to reproduce the stress-CMOD and stress-displacement ratios, which are regularly obtained from the bending test on three notched prisms, will also be analyzed. The analysis of the results regarding the ability to estimate the residual resistances obtained in tests was favorable. The performance of the estimates of (i = 1, 2 and 4) is evidenced, with MED ? 1.0 and CV <25%. The estimate of fR3 was more dispersed, with Mean ? 1.0 and coefficient of variation> 25%, given the high level of prism cracking at the time of recording of this resistance. Finally, this work is of great importance in the scientific environment, especially since steel fiber is a material that has been studied for a long time, and because it is a complex material, a previous study of the behavior of flexural strength is required. of steel fiber reinforced beams, with the main objective to determine values ??(i = 1, 2, 3 and 4) of bending test at three points of notched prisms.