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RECOMMENDED PROCEDURE FOR
MAKING SOIL/AGGREGATE COMPACTION MOLDS FOR TESTING AGGREGATES TREATED WITH
PENNZSUPPRESS® D
The following procedure is for making soil/aggregate compaction molds
specifically used to conduct unconfined compressive strength testing. American
Refining Group, Inc. recommends using ASTM D1557-78 (Method D with a 4-inch
mold) to prepare the compaction molds. The aggregate preparation and
dehydration methods have been developed with the intent of providing an
accurate representation of field performance. Note that material
weights and optimum moisture values may change with different aggregate
material mixes.
1.1 Sieve the materials as necessary to generate enough aggregate to
prepare a compaction mold.
2.1 Dry the sieved material in accordance with ASTM D 2216. Remove from
the oven and allow the aggregate material to cool to room temperature. See
optional procedure under step 5.1.
3.1 Use ASTM D1557-78 (Method D) to grade the necessary aggregate
for the compaction molds.
4.1 The recommended finishing moisture content is the optimum moisture
content derived from the highest point on the proctor curve, the optimum
moisture content includes the added diluted PennzSuppress®
D. The following example calculations are for a 4:1 dilution of
PennzSuppress® D at a treatment rate
of one gallon per square yard and an optimum moisture content of 8%.
Total 8% Moisture For 2500 g 0.08 x 2500 = 200 ml water
total
4.1.1 A volume of 13.75 ml per 1000 g soil is required for a 1
gal/square yard treatment.
Total volume of 4:1 PennzSuppress® D
in 2500 g soil
13.75 ml x 2500 g/1000 g = 34.38 ml
4.1.2 Total water contributed by 34.38 ml of diluted PennzSuppress® D
A + [(34.38 ml - A) x B]
where A = (4 parts water/5 parts total volume) x 34.38 ml
B = 32%
water in the PennzSuppress® D
concentrate / 100
For example, A = [(4/5) x 34.38 ml] = 27.50 ml water
B = 0.32
And, [(34.38 - 27.50) x 0.32] = 2.20 ml water
A water volume of 29.70 ml is contributed by the diluted PennzSuppress®
D.
4.1.3 An additional 200 - 29.70 =170.30 ml of water needs to be
added to the 2500 g of soil. Add the 170.30 ml of water to the graded
aggregate. Thoroughly mix the material until homogenous.
5.1 OPTIONAL METHOD to 3.1 would be to determine the initial moisture
content of the mixed sieved soil, calculate the amount of water contributed by
the diluted PennzSuppress® D, and
then calculate the remaining water needed to bring the overall moisture
content to the optimum percentage as determined by the proctor curve. Any
water required in addition to the diluted PennzSuppress®
D must be added first, before adding the diluted PennzSuppress®
D.
6.1 Add the volume of diluted 4:1 PennzSuppress®
D to the aggregate material. Thoroughly mix the PennzSuppress®
D with the prepared soil. The treated material should adhere when
hand-squeezed. Also referred to as the ”HAMBURGER TEST.”
7.1 Compact the PennzSuppress®
D treated material in the proctor mold according to ASTM D1557-78.
8.1 The compacted molds prepared for unconfined compressive strength
testing should be dried at 40oC for a total of 7 days. Prior
to testing, each dried mold should be allowed to return to ambient temperature
(approximately 20oC). Finishing moisture after drying should be
less than 2% by weight. |
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