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- W639844531 abstract "THE PROBLEMS OF EXPANSIVE SOIL SUBGRADES, EARLY CRACKING OF THIN ASPHALT PAVEMENTS, A GROWING SHORTAGE OF HIGH QUALITY AGGREGATES, FUND LIMITATIONS, AND A SHORT CONSTRUCTION SEASON LED THE COLORADO AND WYOMING STATE HIGHWAY DEPARTMENTS TO EXPERIMENT WITH ASPHALT MEMBRANES, AND FULL DEPTH ASPHALT PAVEMENTS. BASED ON CONSIDERATION OF MOISTURE MOVEMENTS, HYDROGENESIS, AND EQUIVALENCY RATIO DETERMINATIONS, THE FOLLOWING WAS CONCLUDED: (1) ASPHALT MEMBRANES EFFECTIVELY AND ECONOMICALLY MAINTAIN MOISTURE EQUILIBRIUM IN SUBGRADES; (2) FULL DEPTH ASPHALT BASES ARE EFFECTIVE IN REDUCING MOISTURE BUILD-UP IN SUBGRADE SOILS; (3) GRANULAR UNTREATED BASES ARE GOOD WATER PRODUCTION SYSTEMS, COLLECTING MOISTURE FROM THE ATMOSPHERE, THUS ESTABLISHING HYDROGENESIS AS A MAJOR CONTRIBUTOR TO SUBGRADE SATURATION; (4) ASPHALT BASE/UNTREATED BASE EQUIVALENCY RATIOS OF 2 OR 3 TO 1 ARE REASONABLE AND UNDER SOME CIRCUMSTANCES MAY BE CONSERVATIVE; (5) SOIL SUPPORT VALUES UNDER FULL DEPTH ASPHALT BASES ARE CONSIDERABLY HIGHER THAN UNDER GRANULAR BASES WHEN COMPARED TO SIMILAR CONDITIONS DUE TO MAINTAINING A DRYER ENVIRONMENT. FULL DEPTH ASPHALT BASE IS BEING USED ROUTINELY, WHEN WARRANTED BY CONSIDERATIONS OF AGGREGATE AVAILABILITY, HAUL LENGTH, PUBLIC CONVENIENCE, LENGTH OF CONSTRUCTION SEASON, STRENGTH COEFFICIENTS OF THE BASES AND SURFACINGS. IN GENERAL, A LONGER HAUL RESULTS IN A LOWER COST FOR PLANT MIX BASE WHILE A SHORTER HAUL IS GENERALLY FAVORABLE TO UNTREATED BASE COURSES." @default.
- W639844531 created "2016-06-24" @default.
- W639844531 creator A5048935025 @default.
- W639844531 creator A5073488871 @default.
- W639844531 date "1971-01-01" @default.
- W639844531 modified "2023-09-24" @default.
- W639844531 title "EXPERIMENTAL WORK, DESIGN AND CONSTRUCTION OF ASPHALT BASES AND MEMBRANES IN COLORADO AND WYOMING" @default.
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