Post-Crack Flexural and Joint Performance Behaviors of Fiber-Reinforced Concrete for Pavements

2021 ◽  
pp. 036119812110398
Author(s):  
Manik Barman ◽  
Bryce Hansen
Keyword(s):  
Reinforced Concrete ◽  
Residual Strength ◽  
Online Survey ◽  
Load Transfer ◽  
Performance Testing ◽  
The United States ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Joint Performance ◽  
Target Values

This study investigated the influence of fiber properties on the post-crack flexural and joint performance behaviors of fiber-reinforced concrete (FRC) for thin concrete overlays. The study included a literature review, an online survey, and laboratory testing. It was found that the majority (almost 93%) of the FRC overlays in the United States of America were constructed with synthetic macro fibers. In the laboratory study, a total of 46 different FRC mixes were prepared with 11 different types of fibers. Fiber dosage, stiffness, and geometry significantly influenced the residual strength ratio (RSR) and residual strength (RS). In general, stiffer fibers with geometry like embossed, twisted, and crimped shapes showed higher post-crack flexural strength on average than the low-stiffness straight synthetic fibers. From the joint performance testing, it was found that fibers can improve the load transfer efficiency (LTE). A nomogram was developed so that agencies can select fiber dosage and type based on the target values of RSR, RS, and/or LTE.

Flexural Performance Evaluation of Fiber-Reinforced Concrete Incorporating Multiple Macro-Synthetic Fibers

2018 ◽  
Vol 2672 (27) ◽  
pp. 1-12 ◽  
Author(s):  
Michael Dopko ◽  
Meysam Najimi ◽  
Behrouz Shafei ◽  
Xuhao Wang ◽  
Peter Taylor ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Residual Strength ◽  
Performance Enhancement ◽  
Construction Material ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Test Beam ◽  
Synthetic Fibers ◽  
Flexural Performance ◽  
Strength And Toughness

Fiber-reinforced concrete (FRC) is a promising construction material mainly because of the crack-controlling mechanisms that discrete fibers can impart to inherently brittle concrete. Macrofibers, in particular, have been proven effective for providing post-crack ductility and toughness, while synthetic fibers are a promising solution to avoid corrosion-related durability issues. To assess the performance enhancement provided by macro-synthetic concrete fibers, this study performs flexural tests on FRC beams containing three different types of macro-synthetic fibers. The selected fibers include polypropylene (PP), polyvinyl alcohol (PVA), and alkali-resistant glass (ARG) macrofibers mixed at volume fractions of 0.5%, 1.0%, and 1.5%. Static and dynamic fresh properties are monitored using the vibrating Kelly ball (VKelly) test. Beam specimens are then placed under a third point bending configuration, as per ASTM C1609 Standard, to measure load versus mid-span deflection. Strength and toughness parameters are derived from the load–deflection data to assess the flexural performance of the FRC composite systems under consideration. The parameters of interest include first peak strength (pre-crack flexural strength) and post-crack residual strength and toughness provided by fiber addition. Of the mixtures tested, ARG fiber mixtures show the highest residual strength and toughness values, followed by PP and PVA fiber mixtures. ARG fibers produce the most workable mixtures at all fiber volumes, while PVA fibers show a tendency to encounter dispersion issues at higher volume doses. The outcome of this study is expected to facilitate the selection of fibers by giving insight into their relative contribution to fresh and hardened flexural properties of FRC.

A study of some factors affecting the fiber–matrix bond in steel fiber reinforced concrete

1990 ◽  
Vol 17 (4) ◽  
pp. 610-620 ◽  
Author(s):  
Nemkumar Banthia
Keyword(s):  
Reinforced Concrete ◽  
Load Transfer ◽  
Steel Fiber ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete ◽  
Factors Affecting ◽  
Surrounding Matrix ◽  
Pull Out ◽  
Fiber Matrix

With the objective of understanding the reinforcing mechanisms of fibers in steel fiber reinforced concrete, the bond between the fibers and the surrounding matrix is studied by conducting single fiber pull-out tests on fibers bonded in cementitious matrices. Various matrix compositions and fiber geometries have been investigated and the effects of various other factors on the pull-out behavior of the fibers have been quantified through pull-out load–extension plots. Finally, the various modes of fiber–matrix load transfer have been discussed and the favorable and unfavorable conditions for such a transfer have been recognized. Key words: steel fiber reinforced concrete, toughness, fiber–matrix bond, deformed fiber, pull-out tests, load–extension plots.

Sign in / Sign up

Export Citation Format

Share Document