CBR Test – Ensure the Quality before Using


CBR stands for 'California bearing ratio' and it is a test that measures the strength of highway subgrades and base courses through penetration. It can test cohesive materials that have a less than 19mm particle size. There are different kinds of CBR test machines you can use for various applications. You must ensure their quality and the right equipment before you perform the test.

A CBR test machine that comes with a dial gauge and load ring can measure the force and piston travel. It has a 50kN capacity and two travel speeds, which are 1mm/min and 1.27mm/min. There are CBR test machines that come with a digital readout to determine digital force and travel, too. Both are laboratory machines that can provide an accurate measurement of the strength of the structure or material.

Automatic CBR test machines are among the most advanced, with varied ram speeds between 0.5 and 5mm/min. They are compatible with testing and data acquisition software. In an automatic CBR test, the system records corrected CBR values at varying ranges like 0.625, 1.25, 1.875, 2.5, 3.75, 5, 7.5, 10, and 12.55mm, along with the percentage CBR at 2.5 and 5mm. It can be used for load control or displacement. Be sure that you are using an automatic CBR test machine that displays live test graphs and provides Excel output. Moreover, make sure its capacity is at least 50 kN.


There are field CBR testing systems that can be used for onsite evaluation of sub bases and bases. When performing a field test, you need to make sure that the site is not being disturbed by construction activity. Alternatively, you can consider saturating the test sites before you use any equipment to collect conservative data. Field testing systems may be used with a conversion frame for a mechanical CBR test device.

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