The California Bearing Ratio test, (usually called CBR test) is an empirical test developed in California, USA for determining the Relative Bearing Ratio & expansion characteristics under known surcharge weight of base, sub-base and sub grade soils for the design of roads, payments & runways. The CBR test is used extensively in selection of materials & control of sub-grades.
Biography Of Angeliki Cooney | Senior Vice President Life Sciences | Albany, ...
California Bearing Ratio (Aimil)
1. California Bearing Ratio Test
The California Bearing Ratio test, (usually called CBR test) is an empirical test
developed in California, USA for determining the Relative Bearing Ratio &
expansion characteristics under known surcharge weight of base, sub-base and
sub grade soils for the design of roads, payments & runways. The CBR test is
used extensively in selection of materials & control of subgrades.
The test can be performed in the laboratory on prepared samples or in-situ on
location. It is important to appreciate that this test, being of an empirical in nature,
is valid only for the application for which it was developed i.e., the design of
highway base thickness.
2. Salient Features of California Bearing Ratio are:
Compact, bench top design
Rapid Platen Adjustment
Complete with stabilizing bar
Options for mechanical or electrical measurement
Suitable for operation on 220V, 50Hz, single phase, AC supply
Features of California Bearing Test
3. This apparatus, mounted on a rolled steel joist cantilevered from the back of the
truck or fitted to the underside of a mobile frame, can be used to determine the
bearing ratio (generally known as the California Bearing ratio) of soils quickly
and efficiently for the evaluation of strengths of sub-grade & bases for roads &
runway pavements.
This method of testing in-situ, using piston penetration, is useful for determining
the load carrying capacity in the field, when the in-place density and water
contents are such that the degree of saturation is 80% or greater, when the
material is coarse grained and cohesion less so that it is not affected by
changes in the water content when the material has been in-place.
California Bearing Ratio Test Apparatus
4. Models of California Bearing Ratio Test
Apparatus
Laboratory California Bearing Ratio Test
Apparatus, Motorised, Three Speed
Laboratory California Bearing Ratio Test
Apparatus, Motorised, Two Speed with
Mild Steel Moulds
Laboratory California Bearing Ratio Test
Apparatus, Motorised, Electronic
Laboratory California Bearing Ratio Test
Apparatus, Motorised, Electronics with
‘Geostar’ & ‘DAQ’
For more details visit California Bearing Ratio
Test.
5. “Geostar” the Geotechnical Software for
Testing, Analysis & Reporting
The analysis & reporting of following Tests can be performed
Unconsolidated Undrained Triaxial Test
Consolidated Undrained Triaxial Test
Consolidated Drained Test
Direct/Residual Shear Test
CBR Test
One Dimensional Consolidation Test
These package of software's are supplied as required by the purchaser & are accessed
by an activation license supplied by Aimil, allowing the customer to build up a suite of
software on an "as required basis" depending upon the need.
6. Common Features of all the Tests
The software allows selection of British/Indian Standards for analysis as
required.
Tests can be performed in SI, Imperial or metric Units.
Clear & Easy to use. Test information is presented on menu driven screen.
The software directly reads the data format for analysis from StarDAQ.
Customisable Report Header/Footer
The inbuilt utilities include Master Unit Converter, Unit Converter Calculator,
besides the normal & Scientific system calculators.
Database back up & restore facilities are available.
Complete User activity logging is available.
7. Features & Graphs available for CBR Analysis
Software
Special features & graphs available for CBR analysis software:
Manual data entry facility
Find out CBR value in % at 2.5mm & 5mm Penetration
Graph for load vs Penetration (top side, bottom side & both)
Graph correction facility available
Graph expand facility
