Materials selection for concrete overlays : the final report Page: 60
xviii, 192 p. : col. ill. ; 28 cm.View a full description of this report.
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o Novocon XR (NXR).
In Table 4.2, the dosage rate (unless stated otherwise) and property for each fiber are
provided. The dosage rate was recommended by Ryan Barborak, TxDOT CST, based on his
experience with the fibers. TxDOT determined the dosage rate to achieve adequate workability.
In Figure 4.1, pictures of all the fibers are provided.
Table 4.2: Fiber dosage rate and properties
TSSF GMF MAC470 PF F300 NXR
Dosage, lb/CY: 4 1.5 10 4 3.5 50
Specific Gravity: 0.92 0.91 0.92 0.91 0.91 N/A
Aspect Ratio: 74 N/A 37 N/A Graded 34
87- 140-
Tensile Strength, ksi: N/A 80 N/A N/A 180
94 180Figure 4.1. Fibers used in the research
4.3.2 Flow Table for Screening Process
The flow table experiment was performed in accordance with ASTM C1437- 07
"Standard Test Method for Flow of Hydraulic Cement Mortar." The goal was to explore how
the different materials used in the research affect workability and so help researchers eliminate
the mixture proportions that performed poorly (i.e. bad workability and would be difficult/if not
impossible to mix, cast, and/or place). Since the research involved the addition of fibers,
understanding the interaction between fibers and different aggregate ratios and cement contents
was one of the objectives of the experiments. One liter of mortar per design mixture was made in
accordance with ASTM C109 "Standard Test Method for Compressive Strength of Hydraulic60
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Kim, Dong H.; Fowler, David W.; Ferron, Raissa P.; Trevino, Manuel M. & Whitney, David P. Materials selection for concrete overlays : the final report, report, July 2012; Austin, Texas. (https://texashistory.unt.edu/ark:/67531/metapth303706/m1/80/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.