Materials selection for concrete overlays : the final report Page: 63
xviii, 192 p. : col. ill. ; 28 cm.View a full description of this report.
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160
140
" 120
100q'80 goL~
60
S40 - PF -m-MAC470
20 - TSSF -GMF
0 NXR - F300
Recommended Double Triple
WRDA 82 Dosage
Figure 4.5: 5.5 sack mixture with different WRDA 82 dosage
The comparison of workability between the fibers shows that PF produced the least
workable mixtures. This is likely attributed to the high surface area for a given weight compared
to the other two fibers. PF is designed to shear into tiny strands of fibers once it is introduced
into the mixer causing its surface area to increase.
Another interesting discovery during this part of the research was that fibers tend not to
blend into the concrete mixture until water reducer was added. As Figure 4.6 shows, white
strands of fibers (TSSF) were acting as separate inclusions in the mixture. However, once the
water reducer was added, the fibers blended into the mixture, as shown in Figure 4.7, with
increased workability. It seemed as if the water reducer acted as a wetting agent to help coat
fiber strands with the mortar.Figure 4.6. Mortar with fiber before adding WRDA 82
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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/m1/83/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.