CBR (California Bearing Ratio) Tests Explained
CBR (California Bearing Ratio) Tests Explained Originally developed by the California Division of Highways in the 1930’s, this test has been developed and adapted to form the basis of most testing for subgrade quality and
compaction.
Why would I need to do this test?
If you have excavated virgin land that you wish to construct on, and have found clay or sand and want to know if it’s strong enough to bear weight, a sample can be taken and used in a CBR test.
What is the process for this test?
A sample of the material that needs testing is loaded into our mould, either on site or in our laboratory. Then a 3sq inch (approx. 50mm dia) plunger is loaded against the sample and the penetration into the sample is measured at various increments.
What will we find out?
The results are expressed in relative terms, as a percentage of the determined value of 3000lbf to penetrate 0.1inch (2.5mm at 13.3KN in today’s terms) in the originals tests. In modern construction, the required CBR value is specified for soils and fill from formation level up through granular fills to the sub-base immediately below a concrete slab or asphalt road.
CBR (California Bearing Ratio) Tests Explained Originally developed by the California Division of Highways in the 1930’s, this test has been developed and adapted to form the basis of most testing for subgrade quality and
compaction.
Why would I need to do this test?
If you have excavated virgin land that you wish to construct on, and have found clay or sand and want to know if it’s strong enough to bear weight, a sample can be taken and used in a CBR test.
What is the process for this test?
A sample of the material that needs testing is loaded into our mould, either on site or in our laboratory. Then a 3sq inch (approx. 50mm dia) plunger is loaded against the sample and the penetration into the sample is measured at various increments.
What will we find out?
The results are expressed in relative terms, as a percentage of the determined value of 3000lbf to penetrate 0.1inch (2.5mm at 13.3KN in today’s terms) in the originals tests. In modern construction, the required CBR value is specified for soils and fill from formation level up through granular fills to the sub-base immediately below a concrete slab or asphalt road.
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