Materials selection for concrete overlays : the final report Page: 66
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Table 4.4: Mixture proportion in coded units
Run Fly Ash FA/(FA+CA) Cement Cont.
1 -1 -1 -1
2 +1 -1 -1
3 -1 +1 -1
4 +1 +1 -1
5 -1 -1 +1
6 +1 -1 +1
7 -1 +1 +1
8 +1 +1 +1
9-center 0 0 0
10-center 0 0 0
11-center 0 0 0
12-axial -1 0 0
13-axial +1 0 0
14-axial 0 -1 0
15-axial 0 +1 0
16-axial 0 0 -1
17-axial 0 0 +14.4 Tests
In order to establish the properties and practicality of using the candidate materials, a
series of laboratory tests was performed. Candidate materials were previously characterized,
passed through a screening process, and tested for performance limits. For each test, a factorial
matrix was performed. In addition, effects of using fibers in the mixture were experimentally
determined. Using a constant mixture design, a control specimen and specimens with different
fibers were made for each test. The mixture design is provided in Appendix B-2.
4.4.1 Compressive Strength
The compressive strength of concrete is a widely utilized parameter that can help quickly
determine whether a given concrete is capable of withstanding typical traffic loads. The
compressive strengths were determined in accordance with ASTM C39- 10 "Stand Test Method
for Compressive Strength of Cylindrical Concrete Specimens." For each mixture, six 4-in. by 8-
in. cylinders were made. Seven-day and 28-day strengths were determined.
The cylinders were cured for 24 hours in the mixing room, which is kept constantly at
72F. For the first hour, they were cured uncovered. After an hour, they were covered with wet66
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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/m1/86/?rotate=0: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.