Laboratory Simulation of Field Compaction Characteristics (Phase 1);Final rept

摘要

Fill materials are used in almost all roadway construction projects. When fill materials are used, the engineering properties of the soil need to be improved by compacting it. The direct consequence of soil compaction is densification, which in turn results in higher strength, lower compressibility, and lower permeability. Most of construction specifications for fill materials are based on laboratory compaction tests. These laboratory compaction tests are designed to represent the highest degree of compaction that can reasonably be achieved in the field. The most common of these laboratory tests are the standard and modified Proctor tests. Both of these tests utilize impact compaction, although impact compaction shows no resemblance to any type of field compaction and is ineffective for granular soils. Since the development of the Proctor tests, there have been dramatic advances in field compaction equipment. Therefore, the Proctor tests no longer represent the maximum achievable field density.