Effects of Higher Strength and Associated Concrete Properties on PavementPerformance

摘要

The main objective of this project is to determine the effect of the concretequality on pavement performance, specifically the effect of increasing strength and altering associated properties. In many current paving specifications quality is defined by flexural strength, compressive strength, and air content. It is possible that PCC properties other than strength and air content may prove to be good or better indicators of improved long-term performance of concrete pavements. To fulfill the research needs described above, the Federal Highway Administration (FHWA) initiated this project in October 1995. The overall objectives are to: (1) Determine the properties of portland cement concrete of higher strength found in certain inservice pavements which resulted in exceptional long-term performance, particularly as evidenced in freedom from distress near joints and free edges. (2) Identify test methods to measure (quantify) these properties. Also determine the material characteristics of the concrete constituents and their proportions, which are responsible for the levels of these properties found in the concrete. (3) Develop, if necessary, revised mix design procedures including any additional fresh or hardened concrete tests, and develop recommendations for mix designs that will result in the production of concrete for use in pavements for mix designs that will result in the production of concrete for use in pavements that would possess these properties while still meeting current construction requirements and economic considerations.