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  1. geoeng44

    Poor CBR tests in crushed rock gravel

    I had two CBR tests run in a crushed rock gravel, gap-graded with about 20 percent fines. It was produced by a rock crusher on-site, and acts a lot like screenings. The CBR results are a concave shape for the entire curve up to 0.5 inch deflection. ASTM says to run the tests again, however, I...

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