TM 5-822-5/AFM 88-7, Chap. 1
CHAPTER 11
CONCRETE PAVEMENT
used for concrete with the maximum size aggregate
11-1. Mix Proportioning and Control.
up to 2 inches. When aggregate larger than the 2-
Proportioning of the concrete mix and control of
inch nominal size is used in the concrete, the cross-
the concrete for pavement construction will be in
sectional dimensions of the beam will be at least
accordance with TM 5-822-7. Normally, a design
three times the nominal maximum size of the
flexural strength at 28-day age will be used for the
aggregate, and the length will be increased to at
pavement thickness determination. Should it be
least 2 inches more than three times the depth.
necessary to use the pavements at an earlier age,
consideration should be given to the use of a design
11-3. Special Conditions.
flexural strength at the earlier age or to the use of
high early strength cement, whichever is more
Mix proportion or pavement thickness may have to
economical. Flyash gains strength more slowly than
be adjusted due to results of concrete tests. If the
cement, so that if used it may be desirable to select
tests show a strength gain less than predicted or a
a strength value at a period other than 28 days if
retrogression in strength, then the pavement would
time permits.
have to be thicker. If the concrete strength was
higher than predicted, then the thickness may be
reduced. Rather than modifying the thickness
11-2. Testing.
required as a result of tests on the concrete, the mix
The flexural strength of the concrete and lean con-
proportioning could be changed to increase or
crete base will be determined in accordance with
decrease the concrete strength, thereby not chang-
ASTM C 78. The standard test specimen will be a
ing the thickness.
6- by 6-inch section long enough to permit testing
over a span of 18 inches. The standard beam will be
11-1
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