25
While the table may seem confusing it simply states that, for example, one
should correct for a mat thickness of 37.5mm (1.5 inches) only when the
difference between
the top layer and bottom layer densities is 6% or more. If the mat is 50mm
(2.0 inches), then use the nomograph when the density difference is 10% or
more.
Since a density difference greater than 10% is seldom encountered, one
need only be concerned when the mat thickness is 50mm (2.0 inches) or
less.
If field procedures involve establishing a passing density using a test strip
then only relative densities are important and no corrections are necessary.
3.7.2.3 Soil Measurements
Set the mode to Soil as described above in 3.7.2. Press
MEAS
key
After counting down from 1:00 the dry density (DD), percent moisture
(%M), wet density (WD), moisture (M), and percent proctor (%PR) will
appear in the display.
If you need the actual counts, pressing
F4
(*NEXT) the DC (density counts),
DS (density standard), MS (moisture standard) and MC (moisture counts),
will indicate the counts used to determine the computed data. The VR and
%AV will indicate void ratio and percent air voids. The latter is quite useful
to assure that the moisture calibration including the KVAL used fits the
chemistry of the soil. Well-compacted soil should have air voids between
3% and 5%. If the value is negative, comparative data must be run against
oven dry or other acceptable methods to determine the correct KVAL.
MDEPTH indicate measured depth.
TAKING MEASUREMENT
TIME REMAINING
1:00
DC = XXXX.X
MC = XXX.X
DEPTH = BAC
DD = XXX.X
% M = XXX.X
WD = XXX.X
M = XXX.X
% PR = XXX.X MAXD = XXX.X
* NEXT
MDEPTH = BAC
DC = XXXX.X DS = XXXX.X
MC = XXX.X
MS = XXX.X
VR = XX.X
%AV = XX.X
* LAST
MDEPTH = BAC
