Abstract:
THE HIGHWAY IS DIVIDED VERTICALLY INTO THREE MAJOR CATEGORIES: MATERIAL SOIL-FOUNDATION, SOIL-SUBSTRUCTURES, AND SUPERSTRUCTURE. ONLY THE FIRST TWO CATEGORIES ARE DISCUSSED HERE. DRAINAGE IS DISCUSSED IN TERMS OF THE EFFECTS OF IMPOUNDED WATER ON HIGHLY EXPANSIVE AND PLASTIC SOIL. TO OBTAIN A SMOOTH RIDING SURFACE, EITHER THE NATURAL SOIL-FOUNDATION AND THE SOIL-SUBSTRUCTURE MUST BE OF MATERIALS THAT WILL NOT MOVE WITH MOISTURE CONTENT FLUCTUATIONS OR THE MOISTURE CONTENT FLUCTUATIONS IN EXPANSIVE AND PLASTIC SOILS MUST BE CONTROLLED TO SUCH A DEGREE THAT SUBSEQUENT MOVEMENT IN THE SOIL WILL NOT BE OBJECTIONABLE.
Supplemental Notes:
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