fications of the class 5 special subbase. A subbase
TEST RESULTS
from taxiway A at the Albany, New York, airport
most closely matched the gradation of the class 4
Physical properties
special subbase specifications. We report here,
Grain size distribution
where available, the comparable data for these
We analyzed the particle size of the materials
substitute materials. A full report of their original
according to ASTM standard D422-63 and clas-
testing can be found in Cole et al. (1987) for the
sified them according to ASTM D2487-83 as
Albany taxiway A subbase and in Cole et al. (1986)
shown in Table 2. Table 2 also lists the equivalent
for the dense-graded stone.
classification according to AASHTO (1990). The
resulting grain-size distribution curves are shown
Matrix of laboratory testing
in Figure 1; final data from the analyses are in
Table 1 summarizes the matrix of laboratory
Appendix A. Figure 1 includes the revised speci-
tests conducted on the Mn/DOT materials and
fication limits for the class 3 special and class 6
includes recommended future work. The table in-
special materials. The blended class 3 special ma-
cludes the tests that had been conducted on the
terial is slightly finer at sieves no. 10 and no. 40
class 3 special and class 6 special "blended" sam-
than required by the specifications; the class 3
ples prior to receiving the "stockpile" materials.
special stockpile meets the specification limits.
Further testing of the blended samples was stopped
Grain size distribution data are unavailable for the
when the stockpile materials were received.
Table 1. Laboratory tests performed on Mn/ROAD materials.
Physical properties
Grain
Specific Atterberg Organic
Compact
Frost
Hydraul.
Unfrozen
Material
size
gravity
limits
content
test
suscept.
prop.
moisture
Subgrade
1171 (563)
o
o
o
o
o
o
o
o
1193 (564)
o
o
o
o
o
o
o
1206 (565)
o
o
o
o
o
o
o
o
1232 (566)
o
o
o
o
o
o
o
o
Class 3 sp
Blended
o
o
o
o
Stockpile
o
o
o
o
F
o
o
Class 4 sp
Taxiway A
subbase
Class 5 sp
Densegraded
stone
Class 6 sp
Blended
o
o
o
o
Stockpile
o
o
o
F
o
Notes:
o work completed in this study
data estimated from previous studies
F recommended future work
no plan to complete this cell in test matrix
"Blended" materials were created from two components supplied by Mn/DOT
"Stockpile" materials were furnished from stockpiles created for the Mn/ROAD project
2
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