Mechanical Characterization of Concrete Reinforced With Composite Glass Macrofibre

Abstract

The introduction of fibre reinforced concrete (FRC) as a structural material in the fib Model Code 2010 represents an important advance for this technology. Nevertheless, it makes even more relevant the concern about the knowledge of parameters for quality control. In this context, the introduction of new fibres in the market should be followed with simple and reliable test methods to perform its evaluation. One of the major problems is the determination of fibres mechanical properties through tests that require the use of yarns, which are not easily available for the consumers. Other concern is related to difficulties associate to the execution of the FRC evaluation through the EN 14651 three-point bending test (3PBT) for regular quality control. This test was chosen by the fib Model Code to parameterize the FRC post-crack behaviour but requires more complex equipment and careful execution. This paper presents an experimental investigation using composite AR-glass macrofibre, performing the fibre characterization directly in the macrofibre and post-cracking behaviour measured with 3PBT test together with the double punch test (DPT). The tensile strength measured directly in the composite glass macrofibre showed good results, but the Young's modulus procedure needed further implementation to increase accuracy in deformation measurements. The results also indicate an excellent correlation between the 3PBT and DPT, what makes possible to perform regular quality control of FRC in a simpler mode, even when composite glass macrofibre was used.