California Bearing Ratio Test Equipment

The californian bearing ratio cbr test is a penetration test used to evaluate the subgrade strength of roads and pavements.

California bearing ratio test equipment. The internal effective height of the mould is 17 7 cm. Penetration piston for cbr test is required for california bearing ratio cbr testing of soil and base. Full crb test required apparatus full test procedure the calculation to evaluate california bearing ratio and uses of the test result is explained here. It is designed for testing cohesive materials with a particle size less than 19mm in australia the governing standard is as 1289 6 1.

Apparatus consists of a mold of 15 cm internal diameter with a base plate and collar. The florida limerock bearing ratio lbr fm 5 515 laboratory test was developed to evaluate limerock and other soils used for the base subgrade and embankment materials typically found in florida. They are available individually and also as a component within the bra 55 cbr test set. It is the ratio of force per unit area required to penetrate a soil mass with standard circular piston at the rate of 1 25 mm min.

California bearing ratio is the percentage of stress a soil specimen can resist for a certain amount of penetration relative to the value of stress of which a standard soil could resist. This test method shares much of the same equipment and procedures used with the laboratory cbr test. Cbr components encompass the products widely used in cbr testing on load bearing soil in accordance with astm d1883 and aashto t 193 13 standards. It is with the standard circular piston at the rate of 1 25mm min.

California bearing ratio test of subgrade soil equipment for cbr test. The laboratory c b r. Cbr is the ratio of the force required per unit area that is needed to penetrate the soil mass. The california bearing ratio test cbr test is a penetration test developed by california state highway department u s a for evaluating the bearing capacity of subgrade soil for design.

To that required for the corresponding penetration of a standard material. This cbr testing set provides accurate results for the california bearing ratio test due to technical difficulties checking out with a credit card may fail. Developed by the california state highway department usa before the second world war the california bearing ratio test is a test that evaluates the bearing capacity of subgrade soil. The results of these tests are used with the curves to determine the thickness of pavement and its component layers.

This is the most widely used method for the design of flexible pavement.