Garrard, Brian John (2005) Comparison of moisture density relationship tests in civil engineering materials. [USQ Project]
Introduction: Current Moisture Density Relationship (MDR) tests use a manual method of
compaction that is physically arduous and subject to some technical problems.
This project aims to use a vibratory method of compaction using an electric
jackhammer to address these problems.
Background: The MDR test is used to establish the Maximum Dry Density (MDD) and the
Optimum Moisture Content (OMC) of coherent constriction materials for
embankments, footings and pavements. This result is compared to the result of a
field density test to find the relative density for quality control of construction
Methodology: A 1240 W electric jackhammer with a flat compaction plate was to supply
compaction energy to the sample. The jackhammer was initially used hand held
to find the compaction characteristics of the jackhammer then an apparatus was
designed and built to hold the jackhammer during operation. Comparison was
made between the results from Queensland Main Roads test method Q110A and
the project results. Testing consisted of 4 test series exploring the relationships
- The time of compaction and maximum dry density.
- The reciprocating mass of the electric jackhammer and maximum dry
- Standard deviation, spread of results, average maximum dry density and
optimum moisture content between the project method and test method
- The performance of the project method as applied to different soil types.
Conclusions: The project results suggest that a vibratory method of compaction may be a
solution to some of the technical and ergonomic problems associated with
manual compaction methods. More tests are needed to validate the method.
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|Item Type:||USQ Project|
|Item Status:||Live Archive|
|Faculty / Department / School:||Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering|
|Date Deposited:||11 Oct 2007 00:21|
|Last Modified:||02 Jul 2013 22:32|
|Uncontrolled Keywords:||moisture density relationship (MDR), materials testing, jackhammer, vibratory compaction|
|Fields of Research :||09 Engineering > 0905 Civil Engineering > 090501 Civil Geotechnical Engineering
09 Engineering > 0914 Resources Engineering and Extractive Metallurgy > 091402 Geomechanics and Resources Geotechnical Engineering
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