Fiber Reinforced Concrete Interfaces

What is it about?

Some properties of FRC can be obtained by direct methods or experiments 'such as compressive strength, tensile strength, splitting strength and flexural strength'. However, some other properties are still difficult for measuring by the same direct methods, 'such as friction coefficient'. In this paper, an alternative method is introduced to predict some interfacial properties at the interface between the concrete and the fiber using calibration between experimental results and computer aids. Also, in this study, the role of fiber diameter on the frictional bonding properties at the interface of fiber/concrete matrix is evaluated.

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Photo by Nathan Watson on Unsplash

Photo by Nathan Watson on Unsplash

Why is it important?

This paper presents a series of single fiber pull-out tests on steel or glass fiber embedded in a cementitious matrix. The phase of fiber sliding in concrete matrix has been defined using shear lag model, and then governing equations for the sliding mechanism have been derived using analytical model. An FEM analysis is then used to calibrate the frictional coefficient. Further analysis relating to the pressure on the fiber due to the surrounding concrete has been done, and the conclusion that a smaller fiber diameter would improve the bond strength. The relationship between the surrounding concrete pressure and the size of fiber diameter has been discussed as well, and the results showed that a smaller fiber diameter would increase the matrix pressure and then better frictional-bond strength and behavior would be expected compared to greater values of fiber diameter.

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