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Develop Guidelines and Design Program for Hot-Mix Asphalts Containing RAP, RAS, and Other Additives through a Balanced Mix-Design Process

Project Summary

UTEP will provide TxDOT with an Asphalt Concrete (AC) mix design program and guidelines to determine the optimum recycled asphalt pavement (RAP), recycled asphalt shingles (RAS), and additives content for designing balanced mixes without compromising the quality and performance of the final product.

During this project, the university will: 1. Evaluate current mix designs, design processes and guidelines for use of RAP, RAS, and additives on AC mixes in Texas and worldwide to identify weaknesses and strengths of current practices for balanced mix designs involving RAP, RAS, and other additives. 2. Gather laboratory and field performance of sections studied under Research Project 0-6679. These sections are identified as historical and in-service sections (sections to be determined by TxDOT) constructed with and without RAP, RAS, and additives. 3. Determine correlation of laboratory results to pavement sections studied under Research Project 0-6679 (chosen by TxDOT) using performance indicators from tests such as the overlay tester (OT) and Hamburg wheel tracking device (HWTD) and strength parameters like the Indirect Tensile strength from past research projects to implement a protocol for a balanced cracking and rutting resistant mix containing RAP, RAS, and other additives. 4. Evaluate at least 15mixes used by TxDOT through a factorial experiment to assess the influence of RAP, RAS, and additives on the performance of balanced Hot Mix Asphalt (HMA) mixes. 5. Evaluate the feasibility of an AC mix design process that not only consider the raw and recycled materials but also incorporates the structural design of the pavement section to reliably characterize the performance of the designed AC mix. 6. Develop a design program for TxDOT pavement designers and engineers to determine the optimum RAP, RAS, and additive contents on AC mixes with varying aggregate type, asphalt content and grade and (if feasible) structural design of the pavement.

Project Number

0-6923

Status

Completed

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Project Details

Start Date

6/22/2016

Renewal date

9/1/2020

End Date

8/31/2022

Performing Institution(s)

The University of Texas at El Paso (UTEP)

Research Team

RS: Soheil Nazarian

Sponsor

Project Manager

Tom Schwerdt

Contract Specialist

Barbara Cisneros

TxDOT Advisor

Ryan Barborak, MTD
Enad Mahmoud, MTD
Travis Patton, MTD
Ramon Rodriquez, LRD
Daniel Garcia, PHR
Gisel Carrasco, AUS
Miguel Arellano, AUS
Stephen Kasberg, WAC

Amount Funded

$959,250

Publications from this Project

Publications Note

For recently completed projects without reports listed, please contact the Research Supervisor (RS) listed in Project Details if information is needed about the status of research findings.

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Functional Area

Construction, Maintenance and Materials

Index Terms

Hot mix asphalt
Recycled materials
Shingles
Asphalt concrete
Cracking of asphalt concrete pavements
Mix design
Overlays (Pavements)
Pavement performance
Pavements

Lead University

UTEP

Researcher

Nazarian, Soheil, 1955-

Geographic name

El Paso, Tex.

TxDOT District

MTD
AUS
BRY
LRD
PHR
WAC

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Comments

kevyn

"UTEP Center Signs Interagency Cooperative Contract with TxDOT to Develop Sustainable Street Surfaces" (November 13, 2019) https://www.utep.edu/newsfeed/campus/utep-center-receives-txdot-grant-to-develop-sustainable-street-surface.html

6/22/2020 at 3:06 PM

Helpful?

Record Added:

7/28/2016

Record Updated:

7/22/2023 5:36 AM EDT

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