Macro-polyolefin fiber pull-out behaviour from HPC matrix: evaluation of type of surface treatment

Abstract

In this paper, the effect of different surface treatment of a smooth Polyolefin macro-fibre (macro-PO) on the pull-out behaviour from high performance cementitious (HPC) matrix is investigated. The macro-PO fibres were treated in the way that grooves provided in longitudinal and transverse directions on the surface. A latex surface treatment also used for macro-PO to evaluate frictional interaction between the fibre and matrix. The details of pull-out test results were compared with un-treated macro-PO to determine the effectiveness of different surface treatment on load-bearing capacity during pulling-out process. From the results of pull-out test it was found that treatment of fibres with mechanical modification in fibre axis direction can increase the bonding strength and the energy absorption capacity during pull-out.

Keywords:

• Polyolefin
• surface treatment
• pull-out behaviour
• cementitious matrix

Acknowledgement

The authors would like to express their sincere thanks to Iran National Science Foundation (INSF) for the support given through research Grant number of 96008938.