Pull-out response of macro synthetic fibre from concrete matrix: Effect of loading rate and embedment length

Abstract

The single fibre pull-out response of macro synthetic fibre from concrete matrix has been investigated and reported in this study. Particular attention has been given to the response of the interfacial shear resistance between the matrix and fibre to loading rate at different fibre embedment length. One mix design and one fibre type have been used throughout the experiment while four orders of magnitude of loading rate and three embedment lengths are the variables evaluated. The effect of loading rate on the tensile strength of the macro synthetic fibre under four order of magnitude of loading rates is also reported. All tests were conducted in a controlled climate room at a temperature of 23±1°C and a relative humidity of 65±5%. Experimental test results have shown that the ultimate tensile strength of the fibres is dependent on the loading rates. Pull-out behaviour from concrete matrix is shown to be slip softening and sensitive to loading rate and embedment length. All fibres pulled out of the concrete matrix without fracturing. Pull-out load increases as the loading rate and the embedment length increases.