This service is for construction contractors and civil engineers.

How is a CBR test done?

The basic site test is performed by measuring the pressure required to penetrate soil with a plunger over a standard area. The measured pressure is then divided by the pressure required to achieve an equal penetration on a standard crushed rock material. The harder the surface, the higher the CBR percentage.
Tests are carried either in situ or on samples taken and returned to the laboratory. The results obtained are compared with the curves of a standard test to give an idea of the strength of the subgrade soil.

How long does it take to get the results?

The California Bearing Ratio is measured at various points on the construction site (usually at around 30 metre intervals for new road construction), and can usually be completed in a day with a final report usually emailed the following day.