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  1. USCU

    HMA aggregate size and gradation design

    GRADATION: I don't understand the differences between the "coarse" and "medium" gradations used by Caltrans (neither of which is "open"). SIZE: When would you use a 3/4" as opposed to a 1/2", what are the benefits and drawbacks? When would you specify a 1/2" course as opposed to a 1/2"...

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