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Fibers 2018, 6(3), 47; https://doi.org/10.3390/fib6030047

Influence of Steel and Macro-Synthetic Fibers on Concrete Properties

1
Department of Civil, Environmental, Architectural Engineering and Mathematics, University of Brescia, 25123 Brescia, Italy
2
Civil Engineering and Engineering Mechanics Department, Columbia University, New York, NY 10027, USA
*
Author to whom correspondence should be addressed.
Received: 5 June 2018 / Revised: 25 June 2018 / Accepted: 29 June 2018 / Published: 11 July 2018
(This article belongs to the Special Issue Recent Advancements in Fiber Reinforced Concrete And its Applications)
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Abstract

Fiber addition has become one of the most prevalent methods for enhancing the tensile behavior of concrete. Fibers reduce cracking phenomena and improve the energy absorption capacity of the structure. On the other hand, the introduction of fibers can introduce a negative impact on concrete workability, whose loss is influenced by different parameters (among which are fiber content and fiber type). In this context, an exploratory study on the influence of steel (high stiffness) and macro-synthetic (low stiffness) fibers on the fresh properties of concrete was carried out, considering workability and air content, as well as resultant mechanical performance. Four fiber types at two volume fractions (0.5% and 1.0%) were studied in two base concretes with different water-to-cement ratios (0.45 and 0.50) by using the slump test, DIN flow table test and air content meter. An additional parameter for the DIN flow table test is proposed herein to quantify the potential preferential flow direction caused by fiber orientation and entanglement. Air meter results showed that the fibers caused only a slight increase in concrete air content; this agreed well with the results of mechanical testing, which showed no apparent effect on measured compressive strength. In addition, it was captured that, for a given fiber volume fraction, steel fibers more adversely affected Fiber Reinforced Concrete (FRC) workability as compared to polypropylene ones, while the opposite result was obtained considering FRC toughness. View Full-Text
Keywords: workability; air content; steel fibers; polypropylene fibers; fiber reinforced concrete workability; air content; steel fibers; polypropylene fibers; fiber reinforced concrete
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Guerini, V.; Conforti, A.; Plizzari, G.; Kawashima, S. Influence of Steel and Macro-Synthetic Fibers on Concrete Properties. Fibers 2018, 6, 47.

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