Study on Mechanical Properties of Fiber-reinforced Concrete

Abstract

Concrete is a widely used building material. However, due to its inherent shortcomings, such as its susceptibility to cracking and poor toughness, the durability and service life of a structure are greatly affected. To explore the enhancement effects of different fiber types and blends on crack resistance and toughness of concrete, this study presents the models of different kinds of fiber-reinforced concrete (FRC) with different contents. Various combinations of carbon fiber, aramid fiber, and a hybrid fusion of both were simultaneously integrated into concrete using three blends, and the stress–strain curve of FRC was established through axial compression test. The model parameters were analyzed based on three different constitutive models, combined with the test data. On this basis, the finite element model of FRC was established, and the accuracy of the model was verified through test data. Results show that, the compressive strength of concrete with 0.6% fiber content is the highest. The maximum increase rate is approximately 10%, and the fiber hybrid reflects a positive effect. The numerical simulation results of the stress–strain constitutive relationship of FRC under compression decline relatively slowly in the softening section. Comparison between the compressive strength of the model with the test value, the error is less than 15%, thereby affirming the high accuracy of the model. This study provides a significantly reference for the popularization and application of hybrid FRC with carbon and aramid.