Modulus Characterization of MSHA (Maryland State Highway Administration) Base-Subbase Materials for Use in Pavement Design and Rehabilitation. Volume 1. Executive Summary

摘要

The report contains an executive summary of Vols. II through IV and presents the major recommendations and implementations concerning dynamic modulus response of typical MSHA base and subbase materials (asphalt stabilized, cement stabilized and unbound granular). The material response of all materials evaluated was analyzed to determine the most significant properties affecting modulus and hence structural layer coefficents/composite modulus of subgrade reaction. The variables found to be significant for asphalt stabilized materials were: mix type, asphalt content and void volume; for unbound granular materials, the significant variables were material type; subgrade (CBR) support; asphalt layer thickness; compaction effort and degree of saturation; for cement stabilized materials, material type, gradation and cement content were important.