Yet there are varia tions in the procedure used by various transportation. The 50 kn capacity and the fully variable test speed. Aashto t 193 testing services standard method of test for the. This method is used for the laboratory evaluation of subgrade and subbase coarse materials in road construction. Cbr test procedure california bearing ratio for road design. The machine has builtin data acquisition aashto t193 four channels dedicated to two strain gauge load cells and two potentiometric linear transducers. This test follows aashto t193 and is conducted under saturation conditions. The front panel aashto t193 fitted with an emergency button for prompt stopping of the machine. Aashto t193 pdf all the controls products aashto t standard. This test method covers the determination of the california bearing ratio cbr of pavement subgrade. October 2018 sample extruder a jack, lever frame, or other device for extruding compacted. In which condition should the california bearing ration be employed.
An improved california bearing ratio test procedure. To perform this type of test, we propose moulds with various accessories listed in the table below and manual compaction rammers. This test method covers the determination of the california bearing ratio cbr of pavement subgrade, subbase, and basecourse materials from laboratory compacted specimens. This method is intended for determining the inplace density of soils. Cbr is defined as the maximum ratio of pressure required to penetrate the soil with. Yet there are varia tions in the procedure used by various transportation agencies, which result in confusion among. It is the ratio of force per unit area required to penetrate a soil mass with standard circular piston at the rate of 1.
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