This report documents the findings of an investigation made to determine and establish the control parameters which will ensure successful seal coats. During 1972, records of all construction conditions which might affect the performance of seal coats were kept for all projects. Following construction, weather conditions were monitored for several months and observations of the seal coats were made. All relevant parameters were analyzed to try to relate seal coat performance to conditions. Generally, it was found that contract projects were subjected to tighter controls than those done by maintenance personnel. Guidelines for obtaining successful seal coats were established.
RP 70 - Asphalt Pavement Mixture Performance Evaluation, James M. Howard AbstractFinal Report
RP 70
The State of Idaho has many miles of Interstate that are showing signs of premature pavement distress. This distress is evidenced by extensive pavement cracking. The purpose of this research project was to determine the conditions that were contributing to cracking. The study was confined to the southeastern section of the State. Roadway cores were taken and physical properties of recovered cores were determined. Project construction history as well as current national research activities relevant to the study was reviewed. Stripping aggregates and improper asphalt selections were considered the primary factors causing the premature cracking. Selection of asphalt based on its temperature susceptibility is recommended. Since the mechanics and cure for stripping, which simply is a bond failure between the asphalt and aggregate, is still a point of conjecture and until the time that a more definitive answer is available, continued emphasis should be placed on seal coats, permeable bases and low pavement air voids. These are proven steps that can minimize damage to pavements from water induced stripping.
RP 78 Progress 2 - Progress Report of Roadway Revegetation Studies for the Mullan Line West Section of Interstate I-90 Stephen B. Monsen AbstractFinal Report
RP 78 Progress 2
This is a series of three reports that developed planting procedures for revegetation of the Lookout Pass segment of I-90.
