![]() ![]() The most traditional method - regardless of the material - is to retrieve a sample of the material from the field and use laboratory tests to determine the strength of the material, which is then considered representative for other materials near the location from which the sample was taken. A variety of methods exist for measuring the appropriate strength properties for soil, concrete and asphalt. Especially for new Mechanistic-Empirical design procedures, direct measures and/or estimates of pavement stiffness are essential inputs. For overlay designs, engineers require a quantitative characterization of the strength of the existing pavement as well as the underlying soil. This problem is compounded when the design is for an overlay instead of a new pavement. Of those, soil conditions are the most elusive, but are also the most crucial for designing a pavement of proper thickness and stiffness. In designing new pavements, engineers rely on many different measures to characterize the average traffic, climate and soil conditions of the region. ![]()
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