ASTM D1883
Full Name
ASTM D1883 – Standard Test Method for California Bearing Ratio (CBR) of Laboratory-Compacted Soils
Scope
ASTM D1883 is a standard test method used to determine the relative strength of soils. The California Bearing Ratio (CBR) test is commonly used in the design of roadways, airports, and other pavement structures.
Test procedure:
- Soil preparation: the soil sample is compacted to a specific density and moisture content using a standard Proctor compaction test.
- CBR determination: a cylindrical mold containing the compacted soil is placed under a load-testing machine. A standard penetrometer is then forced into the soil at a controlled rate. The load required to achieve a penetration of 0.5 inches (12.7 mm) is recorded.
- CBR calculation: the CBR is calculated as the ratio of the load required to achieve 0.5 inches of penetration in the test soil to the load required to achieve the same penetration in a standard aggregate base material.
Applications:
- Pavement design: the CBR value is used to estimate the strength of the subgrade and base layers of a pavement structure, which helps in determining the thickness and type of pavement required.
- Foundation design: the CBR test can be used to assess the suitability of soils for foundation construction.
- Soil classification: the CBR test can be used as a secondary classification criterion for soils.
ASTM D1883 Accredited Laboratory
Applied Testing & Geosciences, LLC is accredited for performing tests using the ASTM D1883 standard.
Contact us today to learn more about our testing capabilities and how we can support your business.
Resources
Keywords
California Bearing Ratio; CBR; laboratory-compacted soils; compaction; moisture content; standard test method; penetration; surcharge; load; soil; test; apparatus; penetration resistance; bearing capacity; pressure; deformation; modulus