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Compaction
Testing
SK Geotechnical Corporation
understands there are two important factors when it
comes to compaction testing:
reliability and quick response. We
will meet these expectations so the backfilling and
filling operations can continue on schedule.
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Compaction testing in Billings

Utility trench backfilling in
Bozeman, Montana

Proctor density curve

Nuclear density gage

The Home Depot, Helena, Montana
Summit Hotel, Big Sky,
Montana
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Responsiveness
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SK Geotechnical understands the
importance of responsive compaction tests during
construction. If the specified compaction has not been
achieved, backfilling slows down, which affects the
entire project. Our technician, therefore, assists the
contractor in maintaining the proper moisture content and
using the right compaction equipment. On every project,
our technicians verbally inform the client and contractor
of test results prior to leaving the site. Written
results are then issued in the mail within one to two
working days.
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The Proctor Test – A
Benchmark
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For each construction project, the
first step in taking a soil density measurement is the
Proctor test (named for its originator). This test,
performed in a laboratory, establishes the maximum
density achievable for the specific fill soils to be used
at the site. One test is performed for each type of soil
to be used, thereby forming a benchmark for all
subsequent testing at that site.
Generally, SK Geotechnical can perform
a Proctor test in a day or less. However, the time
required for a given Proctor test varies based on the
type and moisture content of the soil tested. Since time
is an expensive commodity in any construction project, it
is important to begin testing as early as possible.
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Individual Compaction Tests
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When results of the Proctor tests are
available, compaction tests on fill and backfill can be
performed. SK Geotechnical most frequently provides
compaction tests through the use of nuclear density
gauges. These devices employ safe, low-radiation nuclear
technology. Results are available immediately: the
technician reads soil density and moisture content
directly from the device's digital display.
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Experience Means Results
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Though compaction testing procedures
are described in industry standards, knowledge and
experience are necessary to obtain reliable results. At
SK Geotechnical, we have gained our knowledge through
more than 20 years experience in compaction testing, and
currently perform more than 3,000 individual tests
annually.
An important reason for our success is
careful attention to quality and staff development.
Equipment is frequently calibrated, experienced personnel
coordinate all work, and only technicians who have
demonstrated proficiency in the necessary test procedures
and data collection techniques are dispatched on field
projects. Government agencies, utilities, contractors,
architects, property owners and developers depend on us
for reliability and quick response.
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