# Pavement Design[1].pptx - Pavement Design I Pavement Design...

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Pavement Design

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I. Pavement Design A. Overview “Principal cause of pavement failure shown above—not the blacktop” Degree of curvature
I. Pavement Design B. California Bearing Ratio (CBR) “How to build a road!”

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I. Pavement Design B. California Bearing Ratio (CBR) 1. The California bearing ratio (CBR) is a penetration test for evaluation of the mechanical strength of road subgrades and basecourses. It was developed by the California Department of Transportation.
I. Pavement Design B. California Bearing Ratio (CBR) 1. The California bearing ratio (CBR) is a penetration test for evaluation of the mechanical strength of road subgrades and basecourses. It was developed by the California Department of Transportation. 2. The test is performed by measuring the pressure required to penetrate a soil sample with a plunger of standard area. The measured pressure is then divided by the pressure required to achieve an equal penetration on a standard crushed rock material.

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I. Pavement Design B. California Bearing Ratio (CBR) 3. “The Test” Take load readings at penetrations of: “the result” 0.025” ……………70 psi 0.05”……………...115 psi 0.1”……………….220 psi 0.2”……………….300 psi 0.4”……………….320 psi Penetrations of 0.05” per minute “Achieve OM &MD” 6” mold
4. Plot the Data

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5. Determine the percent of compacted crushed stone values for the 0.1 and 0.2 penetration. “The Gold Standard” for CBR for 0.1” of penetration, 1000 psi for 0.2” of penetration, 1500 psi Example above: for 0.1” of penetration, 220 psi for 0.2” of penetration, 300 psi The standard material for this test is crushed California limestone
5. Determine the percent of compacted crushed stone values for the 0.1 and 0.2 penetration. “The Gold Standard” for CBR for 0.1” of penetration, 1000 psi for 0.2’ of penetration, 1500 psi Example above: for 0.1” of penetration, 220 psi for 0.2” of penetration, 300 psi Example psi = CBR Standard psi 220 psi = .22, or 22% 1000 psi 300 psi = .20, or 20% 1500 psi CBR of material = 22%

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5. Determine the percent of compacted crushed stone values for the 0.1 and 0.2 penetration. “The Gold Standard” for CBR for 0.1” of penetration, 1000 psi for 0.2’ of penetration, 1500 psi Example above: for 0.1” of penetration, 220 psi for 0.2” of penetration, 300 psi Example psi = CBR Standard psi 220 psi = .22, or 22% 1000 psi 300 psi = .20, or 20% 1500 psi CBR of material = 22%, or “22”
• Fall '19
• Inch, CBR, California Bearing Ratio, crushed stone

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