Effect of Fiber Hybridization on Durability Related Properties of Ultra-High Performance Concrete

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Title: Effect of Fiber Hybridization on Durability Related Properties of Ultra-High Performance Concrete

Author(s): Piotr Smarzewski, Danuta Barnat-Hunek

Publication: IJCSM

Volume: 11

Issue: 2

Appears on pages(s): 315–325

Keywords: ultra-high performance concrete, steel fibers, polypropylene fibers, salt resistance, frost resistance, contact angle, surface free energy.

Date: 6/30/2017

Abstract:
The purpose of the paper is to determine the influence of two widely used steel fibers and polypropylene fibers on the sulphate crystallization resistance, freeze–thaw resistance and surface wettability of ultra-high performance concrete (UHPC). Tests were carried out on cubes and cylinders of plain UHPC and fiber reinforced UHPC with varying contents ranging from 0.25 to 1% steel fibers and/or polypropylene fibers. Extensive data from the salt resistance test, frost resistance test, dynamic modulus of elasticity test before and after freezing-thawing, as well as the contact angle test were recorded and analyzed. Fiber hybridization relatively increased the resistance to salt crystallization and freeze–thaw resistance of UHPC in comparison with a single type of fiber in UHPC at the same fiber volume fraction. The experimental results indicate that hybrid fibers can significantly improve the adhesion properties and reduce the wettability of the UHPC surface.


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