Materials selection for concrete overlays : the final report Page: 64
xviii, 192 p. : col. ill. ; 28 cm.View a full description of this report.
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Figure 4.7. Mortar with fiber after adding WRDA 82
4.3.3 Factorial Matrix
After the screening process, a matrix was formulated. Instead of formulating a full
matrix system, a design of experiment approach using a face-centered cubic (FCC) design was
used to develop the mixture proportions.
Three factors were used for the FCC design and the design was augmented with axial
points. This type of approach reduces the number of tests without sacrificing the accuracy of
data. A FCC design is good to use when the critical factors which affect a response are known,
and the region of interest of where the factors influence the response have been identified.
The results from analyzing a FCC design can be used to (1) determine the factor levels
that will simultaneously satisfy a set of desired specifications, (2) determine the optimum
combination of factors that yield a desired response, (3) achieve a quantitative understanding of
the system's behavior over the region tested and/or (4) determine how a specific response is
affected by changes in the level of the factors over the specified levels of interest. The
advantage of using this approach is that it is a quadratic model and will provide information
about the main effects, factor interactions, as well as the domes and basins in a model.
Three factors-SCM content, fine aggregate-to-total aggregate ratio, and cement
content-were examined at three levels each. The dosage level for each material was selected in
following manner.
* Class F fly ash.
o 0%.
o 25%.
o 50% - to explore the possibility of high volume fly ash in concrete
overlays
* FA/ (FA+CA).
o 0.35 - increased coarse aggregate content.
o 0.40 - typical aggregate ratio.64
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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/m1/84/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.