Category: CBR Testing

CBR value for subgrade

The CBR (California bearing ratio) value is a penetration test that evaluates the mechanical strength of subgrades and basecourses that lay beneath new road constructions or pavements. Typical Values for subgrades are; Crushed stone CBR 20 to 100 Sandy Soils CBR 5 to 40 Silty Soils CBR 3 to 15 Clay Soils CBR 3 to

California bearing ratio typical values

What are the typical CBR values? The harder the material, the higher the CBR value. A CBR value of 2% is usually found for clay, high-quality sub-base will have CBR values between 80% and 100%, and some sands may have values around 10%. The CBR testing can be applied to soils with a maximum particle

What equipment is used for a CBR test?

What equipment is used for a CBR test? Introduction A CBR tests measure the strength of soils and base materials in the field. This information is then used by pavement designers in their work. The field test is done by injecting a piston into the soil at the testing site and making a comparison of

How is a CBR Test Performed?

How is a CBR Test Performed? The California Bearing Ratio (CBR) is a model that was devised by the California Division of Highways engineers in 1938. It is a test for evaluating the mechanical strength of the base courses and subgrades. The performance of the test is done by getting the measure of the required