Longitudinal and transverse profiles were obtained to determine extent of rutting, surface deflection caused by loaded vehicles moving at very low speeds, Pavement curvature at different speeds, stress imposed on the subgrade and temperature distribution in the pavement layers. Vehicles were driven for thousand repetitions (single axle ( 2, 000 – 30, 000 lb) and tandem (24, 000 – 48,000 lb).ĭata were collected from pavement with respect to extent of cracking and amount of patching required to maintain the section in service. Flexible: HMA surface (1-6 “), well-graded crushed limestone base (0-9”), and uniformly graded sand-gravel subbase (0-6”). Tangents sections with different lengths (> 100 ft). Rigid & flexible A-6 subgrade Four lane divided highway loops. Many types of test section were prepared and tested. It is an effort that was carried out with the cooperation of all states and several industry groups. Chapter 16: Highway Engineering, by Paul Wright & Karen Dixon, 7th Edition, Wiley & sons Instructor:ĪASHTO Method/ Introduction īased on the results of AASHTO road test conducted on Ottawa, Illinois. Flexible Pavement Thickness Design / AASHTO Method Source: Chapter 20: Traffic & Highway Engineering by Nicholas Garber and Lester Hoel, Third Edition, Brooks/Cole.
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