Materials selection for concrete overlays : the final report Page: 80
xviii, 192 p. : col. ill. ; 28 cm.View a full description of this report.
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Table 4.8: Results of elastic modulus
Mixture
No. 7 days (GPa) 28 days (GPa)
1 39 43
2 35 43
3 38 42
4 33 39
5 44 48
6 38 44
7 44 47
8 36 44
9 42 46
10 41 45
11 39 45
12 43 45
13 36 40
14 40 44
15 40 47
16 39 46
17 43 48Based on the statistical analysis, it was determined that the 7-day elastic modulus was
significantly influenced by the: SCM content, sacks of cement, and SCM content* SCM content.
However, the regression model was found to be improved when the fine aggregate ratio was
included in the model versus when it was ignored. Including the contribution from the fine
aggregate ratio yielded the following regression model:7-day elastic modulus = 41 - 3 SCM content
sacks of cement - 2 (SCM content)2, and R2=- 0.6 Fine Aggregate Ratio + 2
91%. (4-8)Thus it can be seen that the 7-day elastic modulus was most influenced by the SCM
content. Increasing the SCM content resulted in a significant decrease in the 7-day elastic
modulus.
With regards to the 28-day elastic modulus, the most significant Variables were the
following: SCM content, sacks of cement, SCM content*SCM content. This yielded the
following regression equation:
28-day elastic modulus = 45 - 1.5 SCM content + 1.8 sacks of cement - 2.5
(SCM content)2, and R2= 75%. (4-9)
Similar to the 7-day elastic modulus, the 28-day elastic modulus was most influenced by
the SCM content.80
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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/m1/100/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.