. Bulletin of the Department of Agriculture. Agriculture; Agriculture. POETLAND CEMENT CONCRETE ROADS. 13 pavement, the speed of the vehicle, the character of the tires, and the percentage of the total load which is carried above the springs of the vehicle. Under very unfavorable conditions it may be as high as five times the amount of the static load. The pavement itself depends upon the subgrade for support, and this support is extremely nonuniform in character. The supporting power of a subgrade depends upon the type of soil, its capillarity, the. TRUCK PASSING TRUCK Fig. 1.—Width of r
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. POETLAND CEMENT CONCRETE ROADS. 13 pavement, the speed of the vehicle, the character of the tires, and the percentage of the total load which is carried above the springs of the vehicle. Under very unfavorable conditions it may be as high as five times the amount of the static load. The pavement itself depends upon the subgrade for support, and this support is extremely nonuniform in character. The supporting power of a subgrade depends upon the type of soil, its capillarity, the. TRUCK PASSING TRUCK Fig. 1.—Width of road required for safe passage of vetiicles. proximity of ground water, the condition of surface drainage, the amount of sustained rainfall, and the extent of freezing and thawing. All of these factors are extremely variable, and in combination are almost indeterminate, so that it is almost impossible to reduce the determination of pavement thickness to a simple mathematical com- putation. The behavior of concrete pavements of known thickness under known soil conditions and known conditions of traffic is the most satisfactory index of the thickness of pavement required. It has been more or less customary in the past to use a fiat subgrade for concrete pavements, and obtain the necessary crown in the pave-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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