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Encyclopedia > California bearing ratio
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California Bearing Ratio - Wikipedia, the free encyclopedia (226 words)
The California Bearing Ratio (CBR) is a penetration test for evaluation of the mechanical strength of road subgrades.
The California Bearing Ratio test is described in ASTM Standards D1883 and D4429, and AASHTO T193.
A CBR of 3 equates to tilled farmland, a CBR of 4.75 equates to turf or moist clay, while moist sand may have a CBR of 10.
CBR, California bearing ratio of soil for road design, CBR, with dynamic soil cone penetometer and mexiprobe (1313 words)
The California Bearing Ratio, believe it or not, was developed by The California State Highways Department.
Conversely if CBR testing indicates the subgrade is weak (a low CBR reading) we must construct a suitable thicker road pavement to spread the wheel load over a greater area of the weak subgrade in order that the weak subgrade material is not deformed, causing the road pavement to fail.
The CBR in spite of its limited accuracy still remains the most generally accepted method of determining subgrade strength, and as such this information, along with information on traffic flows and traffic growth is used to design road pavements.
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