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The predicted and measured compressive strength development for ASTM C109
mortar cubes are provided in Figures 12. The prefactors used in
applying Power's gel-space ratio
[11] to compute the model compressive strengths were 96.5 MPa and
83.6 MPa for cements 135 and 141, respectively. While the 3 d strengths are
slightly underpredicted and the 28 d strengths are slightly overpredicted, all
model predictions are well within 2 standard deviations of the CCRL-determined
experimental values. Because 28 d strength is the
most often used criteria for concrete acceptance during construction, the
ability to adequately predict 28 d compressive strength based on the VCCTL and
an earlier age strength measurement (3 d or 7 d) would result in substantial
cost and time savings to the construction industry.
Figure 12:
Experimentally measured (circles) and model-predicted compressive
strengths for ASTM C109 mortar cubes prepared from CCRL cements 135
and 141 at 23 ºC. Crosses indicate ± one standard deviation
from the mean, as determined in the CCRL testing program.
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