Moving Wheel versus Impact Deflections and Their Use in Pavement Evaluation

Traffic speed deflection devices (TSDDs) have been developed since around 2000 to allow for safe and efficient structural evaluation of highway networks. One barrier to TSDD implementation is the inherent differences in deflections produced by moving truck loads and by falling weight deflectometer (FWD), the current deflection testing standard. To better understand the differences in data produced by the two devices, FHWA sponsored research into one particular TSDD, the rolling wheel deflectometer (RWD). The study utilized the finite layer program ViscoWave to model both FWD and RWD loads to demonstrate the effect of their inherent differences on pavement deflections and other simulated parameters. In addition, ViscoWave was used to generate theoretical FWD and RWD deflections for a diverse set of pavement structures and subgrade conditions. The resulting deflections were used to develop correlations between the two devices, which were validated with side-by-side FWD and RWD field tests performed on 23 sites. The research determined that the differences between FWD and RWD deflections vary depending on pavement factors and loading characteristics. The two devices produced similar deflections on thicker, stiffer, lower-deflection pavements, while the FWD produced relatively higher deflections on thinner, weaker, higher-deflection pavements. Therefore, use of common FWD data analysis programs will produce different results, such as layer moduli, for TSDD devices. Advanced analysis routines capable of modeling the TSDD’s moving load and loading configurations are needed.

Traffic Analysis and Pavement Evaluation along SH-200 (for Mhaisang-Asara Section) in Maharashtra

The globalization, rapid industrialization and urbanization leading for the continual increase in the traffic movement from last decade and the same calls for the properly designed interconnected road network. As such, in the arena of the Traffic Analysis, Pavement Design and Construction, there is an urgent need of economical and innovative Technology that provides sufficient strength and durability to pavement. Pavement gets damaged due to environmental effect and traffic movement. In this study, the following road project is selected for Traffic Analysis and Pavement Design/Evaluation: “Two-Ianing of improvement to SH-200, Akola-Aapatapa-Mhaisang-Aasara Road (Mhaisang to Aasara From Km. 25/000 to 65/200) in Akola District” through Public Private Partnership on Hybrid Annuity basis under Maharashtra Road Improvement Programme (MRIP)”.

Pavement Evaluation Strategies and Ways to Improve the Performance of Asphalt Overlays

Highway rehabilitation is a blooming industry in the world and in particular North America. Highway agencies over the years have experienced problems in addressing pavement deteriorations, troubles with underlying pavement materials and management and evaluation of the existing pavements. This study has two objectives. The first objective is to discuss the types of distresses in both flexible and rigid pavements, pavement evaluation methods and equipment in use, pavement condition rating system, process of field investigation, life cycle cost analysis, and pavement selection strategies. A case study of Highway 401 eastbound collector lanes (from Avenue Road to Highway 404) was carried out to demonstrate the process of pavement evaluation and design. The second objective is to undergo an experimental program to evaluate the potential use of shingle waste into Superpave 19.0 and 12.5 asphalt mixes. The evaluation of volumetric properties of the mixes was performed. The trials demonstrated that volumetric properties of the mixes can be achieved at a lower asphalt content. Performance of mixes containing shingles was evaluated through various Highway agencies proved that incorporation of shingles enhances the performance of HMA mixes by improving durability, and increasing rutting resistance, while achieving comparable fatigue resistance.

Pavement Evaluation Strategies and Ways to Improve the Performance of Asphalt Overlays

Highway rehabilitation is a blooming industry in the world and in particular North America. Highway agencies over the years have experienced problems in addressing pavement deteriorations, troubles with underlying pavement materials and management and evaluation of the existing pavements. This study has two objectives. The first objective is to discuss the types of distresses in both flexible and rigid pavements, pavement evaluation methods and equipment in use, pavement condition rating system, process of field investigation, life cycle cost analysis, and pavement selection strategies. A case study of Highway 401 eastbound collector lanes (from Avenue Road to Highway 404) was carried out to demonstrate the process of pavement evaluation and design. The second objective is to undergo an experimental program to evaluate the potential use of shingle waste into Superpave 19.0 and 12.5 asphalt mixes. The evaluation of volumetric properties of the mixes was performed. The trials demonstrated that volumetric properties of the mixes can be achieved at a lower asphalt content. Performance of mixes containing shingles was evaluated through various Highway agencies proved that incorporation of shingles enhances the performance of HMA mixes by improving durability, and increasing rutting resistance, while achieving comparable fatigue resistance.