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Utilizing polypropylene fibers to improve physical and mechanical properties of concrete

journal contribution
posted on 2012-01-01, 00:00 authored by Rouhallah Bagherzadeh, A H Sadeghi, M Latifi
The influence of polypropylene fibers has been studied in different proportioning and fiber aspect ratios to improve physical and mechanical properties of fiber-reinforced concretes. Fibers are used in two different lengths (12 mm and 19 mm) and proportions (0.1% and 0.3%) in concrete mixture design. Hardened concrete properties, such as 7- and 28-day compressive strength, splitting tensile strength, flexural strength, water and air absorption, and restrained shrinkage cracking were evaluated.

No statistically significant effects were observed for polypropylene fibers on the compressive strength of concrete, while toughness indexes, splitting tensile and flexural strength and durability parameters showed an increase in the presence of polypropylene fibers. Increased fiber availability (fiber aspect ratio) in the concrete matrix, in addition to the ability of longer polypropylene fibers to bridge on the micro cracks, are suggested as the reasons for the enhancement in mechanical properties. Finally, crack width in fiber-reinforced concrete is calculated analytically with fiber property variables (fiber type, length, diameter and proportion). Results are compared with experimental values and concluded that with an increase in fiber length and/or decrease in fiber diameter crack width, decrease significantly.

History

Journal

Textile research journal

Volume

82

Issue

1

Pagination

88 - 96

Publisher

Sage Publications

Location

London, England

ISSN

0040-5175

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2011, The Author(s)

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