TM 5-822-14/AFJMAN 32-1019
Figure 3-1. Chart for the initial determination of lime content.
curing at 120 degrees F for 48 hours has also been
(5) Step 5. Compare the results of the uncon-
found to give satisfactory results; however, check
fined compressive strength and durability tests
tests at 73 degrees for 28 days should also be
with the requirements shown in tables 2-2 and
conducted. Research has indicated that if acceler-
2-3. The lowest lime content which meets the
ated curing temperatures are too high, the pozzola-
unconfined compressive strength requirement and
nic compounds formed during laboratory curing
demonstrates the required durability is the design
could differ substantially from those that would
lime content. The treated material also must meet
develop in the field.
frost susceptibility requirements as indicated in
(4) Step 4. Test three specimens using the
the appropriate pavement design manuals. If the
unconfined compression test. If frost design is a
mixture should meet the durability requirements
consideration, test three specimens to 12 cycles of
but not the strength requirements, it is considered
freeze-thaw durability tests (ASTM D 560) except
to be a modified soil. If results of the specimens
wire brushing is omitted. The frost susceptibility
tested do not meet both the strength and durabil-
of the treated material should be determined as
ity requirements, a higher lime content may be
indicated in appropriate design manuals.
selected and steps 1 through 5 repeated.