Testing of Soils For Engineering Purposes (Soil Laboratory)

Laboratory Accreditation:

Site Geotechnical is accredited in the field of Construction Materials Testing for tests within its scope of accreditation issued by the National Association of Testing Authorities, Australia (NATA).  Accreditation Number 17066.

Laboratory Testing for Assurance:

Specifications for civil engineering projects will typically contain requirements that certain test be performed to provide a measure of assurance that the construction materials and processes meet the design requirements.

Laboratory Tests:

CBR (California Bearing Ratio), is a measurement of soil strength.  Usally a recompacted sample is soaked for 4 days and its strength measured under load.

CBR Test

CLASSIFICATION (Atterberg Limits - Plasticity Index, Liquid Limit, Plastic Limit, Linear Shrinkage & Sieve Analysis) is usally obtained to classify or categorise the soil and its properties.  These tests can be used to assist in the assessment of material quality against specifications.

The following table may be used as a guide when comparing material description, classification and CBR values:

CBR Classification

UCS (Unconfined Compressive Strength), is a measurement of soil strength.  Usally a recompacted sample is soaked for 4 hours and compressed after 7 days curing to confirm or determine strength (similar test to that for concrete specimens), well suited for stabilised or modified materials having cementitious additives having UCS < 2MPa.

The illustration below highlights the strength (after soaking and crushing) which can be achieved with incremental increases in cementtitious additive

Unconfined Compressive Strength

 

SOIL COMPACTION AND DENSITY TESTS. For most projects control of compaction is necessary to ensure adequate density is achieved on-site.  This usally involves laboratory compaction and field density tests using a nuclear density meter.

 

 

 

 

 

 

 

 

 

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