Materials selection for concrete overlays : the final report Page: 74
xviii, 192 p. : col. ill. ; 28 cm.View a full description of this report.
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Figure 4.15.: Exposed CA shown in the prepared surface in SSD condition
4.5 Results
This section contains the results of the tests performed. Results for each test were
analyzed and interpreted.
4.5.1 Analysis of Tests for Factorial Matrix
The results from tests in the factorial matrix were analyzed using a statistical software
program distributed by Minitab Incorporated. By default, Minitab analyzes the designs using
coded units, thus the regression equations will be shown using the coefficients for the coded
units. The advantage of using coded units for analysis is that any erroneous statistical results due
to different measurement scales for the factors (for example, inches vs. centimeters) is
eliminated. Furthermore, using uncoded units tends to inflate the variability in the coefficient
estimates and makes them difficult to interpret. Analyzing the design in the coded units does not
change the variables in the model which are considered significant. However, it would influence
the p-value for the constant term and the coefficients and the standard deviation of the resulting
regression model.
All effects were assumed to be normally distributed with zero mean and the same
variance. All results were first checked for normality and analyzed using the full quadratic
model. Based on the results of the analysis, the most significant variables were determined, and
then alternate models were examined until the best fit (as determined by p-values, R2 values,
standard deviation, and lack of fit test) were selected. Unless otherwise stated, an alpha-value of
0.05 was used (95% confidence interval). Variables that have a p-value less than 0.05 were
considered significant. However, for the lack of fit test, a p-value less than the alpha value of
0.05 indicated that the regression model did not adequately fit the data. Thus, a p-value > 0.05
indicated that the regression model selected was good.
4.5.2 Compressive Strength
The results for the compressive strength are shown in Table 4.5.74
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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/m1/94/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.