The CBR is a test to evaluate the quality of a soil material based on its strength, measured through a scale plate test. CBR stands for “California Bearing Ratio” in Spanish, although in countries like Mexico this test is also known by the acronym VRS, Relative Value of Support. You can visit cbr testing companies online and find the solutions now.
Although it was developed in 1925, the essay begins to appear in the North American standards ASTM (by American Standards for Testing and Materials) from 1964, in its version for laboratory (ASTM D 1883), and in its version for the field (ASTM D 4429) . Despite its multiple limitations, as will be indicated later in this article, today, the CBR is one of the most widespread and accepted trials in the world due to the relative low cost of execution (when compared with triaxial tests), since it is associated with a number of correlations and semi-empirical methods of pavement design.
According to ASTM D 1883-07, the CBR is a load test that uses a metallic piston, 0.5 square inches in area, to penetrate from the surface of a compacted soil into a metal mold at a constant rate of penetration. CBR, the test parameter, is defined as the proportion between the unit weight on the piston necessary to go through 0.1 “(2.5 cm) and 0.2” (5 cm) in the tested soil, and the unit load required to penetrate the same amount on a standard well graded pitted stone; this