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mixture and concrete mixture. Also, air content (ASTM C231) and temperature
(ASTM C1064) measurements were recorded for the concrete mixture.
Compressive strength was also measured on cylinders made from selected
batches of base course and paving slab concrete mixtures, in accordance with
ASTM procedures.
Results and Discussion
Figure 4-26: Open-graded cementitious base course material being placed over filter fabric at
Port Washington Power Plant's high-volume fly ash demonstration project.
• Base Course Material: The compressive strength data is shown in Table 4­
42. The permeable base was designed to have a compressive strength in
the range of 490 to 990 psi. However, the mixture gave 670 psi at 28-day
age and 810 psi at 56-day age.
• Fly Ash Concrete Pavement: Since there already was significant data on
high-volume fly ash concrete, only compressive strength of the pavement
concrete mixtures was measured. Based on earlier work, it was assumed
that a mixture meeting air content and strength requirements would satisfy
other durability requirements.
Table 4-43 gives the compressive strength results for the pavement concrete
mixtures. The mixture showed a compressive strength of 4870 psi at the 28­
day age, which was 20% higher than the design strength of 4000 psi. The
pavement was inspected visually to determine its performance over the past
several years. No obvious pavement distress was seen during the inspection.
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