Project 68

Specifications and Recommendations for Recycled Materials Used as Unbound Base Course

Project 68 provides recommendations and specifications for recycled asphalt pavement and recycled concrete aggregate that can be used as unbound base course.

Project 67

Update of WiscLEACH Roadway Environmental Assessment Software

This project, in partnership with Jackson State University, updates on the development of a software program.  WiscLEACH, a web-based computing tool, is used to evaluate groundwater impacts from beneficial use of industrial byproducts in roadway stabilization and embankment.structural fill applications.

Project 66

Design System for HMA Containing a High Percentage of RAS Material

The primary objective of this research is to develop and validate a simple design system for hot mix asphalt (HMA) containing a high percentage of reclaimed asphalt shingles (RAS).

Project 61

Large Scale Model Experiments of Recycled Base Course Materials Stabilized with Cement and Cement Kiln Dust

The objectives of this study was to determine the resilient modulus of two recycled roadway materials: recycled pavement material and road surface gravel with and without cement and cement kiln dust stabilization. In order to replicate field conditions,  Large Scale Model Experiments were conducted.

Project 55

Evaluation of Recycled Asphalt Shingles as Structural Fill

In this research, possible reuse of discarded asphalt shingles as structural fill was investigated. The engineering properties that were evaluated include: compaction characteristics, hydraulic conductivity, compressability shear strength, and coefficient of lateral earth pressure at rest.

Project 54

Synthesis of Use of Crumb Rubber in Hot Mix Asphalt

Ground tire rubber (GTR) is a unique recycled material and it is not clear what the optimum method for incorporating GTR in the asphalt is. This project focused on developing optimum methods of processing and blending GTR, reacting time between GTR and asphalt binders while blending, and the designing of GTR modified binders to yield superior performance.

Project 52

Evaluation of the Environmental Performance of CCPs in Roadway Applications

This project focuses on two theses:

1. The Leaching of Trace Elements from Roadway Materials Stabilized with Fly Ash

2. Leaching from Soil Stabilized with Fly Ash: Behavior and Mechanisms

Project 50

Evaluation of Testing Protocols for the Environmental Assessment of Fly Ash Stabilized Soils

This project is in partnership with the University of Maryland, was a comprehensive laboratory study to evaluate the trace metal leaching from fly ash stabilized soils.

Project 48

Utilize Cementitious High Carbon Fly Ash (CHCFA) to Stabilize Cold In-Place Recycled (CIR) Asphalt Pavement as Base Course

This project evaluate the performance of cementitous high carbon fly ash stabilized recycled asphalt pavement as a base course material in a real world setting. Three test road cells were built in partnership with MnROAD in Minnesota.

Project 47

Stabilization of Reclaimed Pavement Material and Road Surface Gravel with Coal Combustion Project

Conducted by UW, this project is sponsored by the Minnesota Local Roads Research Board (LRRB), with support from the RMRC. This project is evaluating the stabilization of reclaimed pavement material (RPM) and RAP with CCPs.

Project 45

Modulus and CBR Values for Construction and Demolition Debris (UNH)

This project will be conducted by UNH with a budget of $77,203 to be funded by the RMRC Pooled Fund. Additional funds $42,820 were provided in the form of a tuition and a stipend. This project addresses the need for additional information on coarse and fine aggregate obtained from C&D debris.

Project 44

Assessment of leaching in Embankments constructed with Coal Fly Ash (Colebrook, NH) and C&D Debris (Epping, NH)


This project will be conducted by UNH with a budget of $22,000 funded by US EPA IAG. Monitoring of leachate from a full-scale coal fly ash embankment in Colebrook, NH will continue until the ground freezes in the winter, and will resume in the spring. Additional leaching and hydrogen sulfide monitoring will be conducted at a full-scale embankment constructed of construction and demolition debris fines.