Trb superpave Abstracts 2002

George C. White

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Email: [e-mail]

Joe P. Mahoney

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Email: [e-mail]

George M. Turkiyyah

Phone: [phone]

Email: [e-mail]

Department of Civil and Environmental Engineering

University of Washington

Box 352700

Seattle, WA 98195

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Fax: [phone]

Kim A. Willoughby

Washington State Department of Transportation

Materials Laboratory

1655 S 2nd Ave SW

Tumwater, WA 98512

Phone: [phone]

Email: [e-mail]

E. Ray Brown

National Center for Asphalt Technology

Auburn University

211 Ramsay Hall

Auburn, AL 36849

Phone: [phone]

Email: [e-mail]

Keywords: Hot-mix asphalt, Internet, Database, Pavement, Performance, Construction
ABSTRACT

This paper is used to demonstrate that it is feasible, realistic, and practical to develop and deploy, on a local or national scale, an online database to monitor hot mix asphalt (HMA) projects throughout their life cycle. Such a tool allows for the real-time acquisition and monitoring of mix design, field construction, and performance data, as well as archival of such data. Monitoring includes browsing, searching and analyzing data ranging from mix design and quality assurance/quality control (QA/QC) field data to performance measures such as roughness, cracking, and rutting. In particular, this paper demonstrates early implementation via Washington State’s Superpave project data. The database includes quantitative design and construction data, field instrument readings, infrared and video images, and performance information. Analysis and search capabilities are provided, including a map-based front-end to support spatial searches

and location-based data entry. It is currently available online at http://hotmix.ce.washington.edu/.

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Blue Earth County CSAH 20 – An Engineered Cold In-Place Recycling Project

Al Forsberg

Blue Earth County

35 Map Drive

Mankato MN 56001

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Fax: [phone]

[e-mail]
Erland Lukanen

ERES Consultants

251 Reid Lane

South St. Paul, MN 55075

Phone: [phone]

Fax: [phone]

Todd Thomas

Koch Materials Company

4111 E. 37th St.

Wichita, KS 67220

Phone: [phone]

FAX: [phone]

[e-mail]

ABSTRACT

Cold In-place Recycling (CIR) has been effective at rehabilitating aged pavements, but has lacked well-defined engineering parameters, and success has been inconsistent. To rehabilitate a County State Aid Highway in Blue Earth County, Minnesota, both conventional CIR and a new engineered process were used. The new process includes selection guidelines, a sampling protocol, a new mix design protocol including performance testing of laboratory prepared samples, quality control and quality assurance plan, and a new chemistry asphalt emulsion designed for quicker early strength, higher residual binder content and longer durability. The performance testing includes a new raveling test, thermal cracking testing, strength tests, and moisture susceptibility testing. The design included laboratory crushing the reclaimed asphalt concrete into three gradations. Mix designs were done on each of the gradations, so that when the actual gradation was determined in the field, the correct job mix formula could be selected. The new process CIR samples exhibited superior performance on raveling, thermal cracking and moisture susceptibility testing. Field stiffness testing showed quicker early strength, enabling quicker traffic return. Falling weight deflectometer testing showed higher moduli for the new CIR. While initial costs are about 10 percent higher, the higher binder content and reliability of the engineered process are expected to give lower overall life cycle costs. The costs were significantly lower than new Superpave mix. The project also evaluates several surface treatments. The project will continue to be monitored with time to determine the long-term performance and relative cost benefits.

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Effects Of Permeability And Vehicle Speed On Pore Pressures In Hot Mix Asphalt Pavements

Marc Novak

Graduate Student

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Dr. Bjorn Birgisson

Assistant Professor

E-mail: [e-mail]

Dr. Michael C McVay, Professor

University of Florida,

Department of Civil and Coastal Engineering

P.O. Box 116580

Gainesville, FL 32611-6580

Telephone: [phone]

Fax: [phone]

E-mail: [e-mail]

ABSTRACT

It has been found that coarse-graded hot-mix asphalt mixtures designed under Superpave mixture design criteria may be permeable, and under certain conditions at or near full saturation. A study of a typical coarse-graded Superpave pavement subject to moving loads and saturated conditions was undertaken. Using a coupled finite element analysis based on the theory of mixtures, the influence of permeability, and rate of loading on a saturated flexible pavements subject to dynamic loads was performed. The theory of mixtures provides a link between the void structure (microstructure) of materials and a continuum description that is suitable for finite element formulations. The hot-mix asphalt is treated as a two-phase material, consisting of a solid skeleton and voids, which can be either dry or liquid filled. The results from this study show that significant pore pressures can occur in coarse-graded Superpave mixtures. In addition, the magnitude and distribution of pore pressures were a function of permeability and rate of loading. It is proposed that further study of asphalt skeleton stresses, stripping and layer de-bonding be undertaken.

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The History and Future Challenges Of Gyratory Compaction 1939 to 2001

Thomas Harman

Asphalt Pavement Team Leader

Federal Highway Administration

Turner-Fairbank Highway Research Center

6300 Georgetown Pike, HDRI-11

McLean, Virginia 22101-2296

[e-mail]

John R. Bukowski

Asphalt Team Leader

Federal Highway Administration

Office of Engineering, HIPT-10

400 Seventh Street, S.W. Room 3118

Washington, D.C. 20590

[e-mail]

Francis Moutier

Ingénieur INSA

Laboratoire Central des Ponts et Chaussées (LCPC)

Route de Bouaye . BP 19

44340 Bouguenais, France

[e-mail]

Gerald Huber

Assistant Director of Research

Heritage Research Group

7901 West Morris Street

Indianapolis, Indiana 46231

[e-mail]

Robert McGennis

Technical Manager

Koch Asphalt Solutions Southwest

P.O. Box 2209

Peoria, AZ 85380

[e-mail]

Abstract

History is a dynamic tapestry of facts and perceptions, dates and personalities. This work attempts to capture the events and rational of those who contributed significantly to the use of gyratory compaction in the design and field management of hot-mix asphalt (HMA) and discusses the challenges ahead. Throughout the evolution of asphalt mix design; several different types of laboratory compaction devices have been developed. In general, the goal of these laboratory devices is to fabricate a specimen for volumetric and/or physical characterization. Depending on the system, specimens can be cylindrical, trapezoidal, or rectangular in shape and compaction can be achieved through impact, kneading, or vibration. Gyratory compaction applies a kneading effort to fabricate cylindrical specimens. Gyratory compaction has undergone an evolution resulting in several unique devices and a variety of methods.

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Comparison of Fundamental and Simulative Test Methods for Evaluating Permanent Deformation of Hot Mix Asphalt

Jingna Zhang1

L. Allen Cooley, Jr2

Prithvi S. Kandhal3
1, Research Engineer, National Center for Asphalt Technology, 277 Technology Parkway, Auburn, AL

36830. Office: [phone], Fax: [phone], email: [e-mail]

2, Manager, Southeastern Superpave Center, National Center for Asphalt Technology, 277 Technology

Parkway, Auburn, AL 36830. Office: [phone], Fax: [phone], email: [e-mail]

3, Associate Director, National Center for Asphalt Technology, 277 Technology Parkway, Auburn, AL

36830. Office: [phone], Fax: [phone], email: [e-mail].

ABSTRACT

Rutting has long been a problem in hot mix asphalt (HMA) pavement. Through the years, researchers have used different kinds of fundamental and simulative test methods to estimate the rutting performance of HMA.

It has been recognized that most fundamental tests are very complex while simulative tests are generally easy to perform. This paper documents a comparative study of two fundamental tests, repeated shear at constant height (RSCH) and repeated load confined creep test (RLCC), and one simulative test, Asphalt Pavement Analyzer (APA) rut test. A comparison and correlation of various parameters (permanent deformation or strain, slopes and intercepts from linear or power law regressions) from these three tests results were conducted in this paper. The analysis data showed that the two fundamental tests had significant correlation with APA rut tests. The relationship between the deformation rates and the correlation between initial deformation from the RSCH and RLCC indicate the similar deformation behavior of HMAs under RSCH and APA loading conditions.

Based upon the relationships observed in this paper and the existing guidelines for interpreting RSCH permanent shear strain and RLCC permanent strain, preliminary guidelines were recommended for evaluating rut resistance on the basis of APA rut depth. Compared with the existing APA criteria developed by Georgia DOT, the acceptable rut depth criteria generated from this paper is reasonable and applicable.

KEY WORDS: Hot mix asphalt, asphalt pavement, asphalt mixture, permanent deformation, rutting, creep test, repeated shear, Asphalt Pavement Analyzer

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Field And Laboratory Characterization Of Asphalt Mixes For The Design Of Flexible Pavements

Jonathan E. Crince

Senior Staff Engineer

NTH Consultants, Ltd.

Gilbert Y. Baladi, Ph.D., P.E, Professor (corresponding author)

Michigan State University

Dept. of Civil and Environmental Engineering

3546 Engineering Building

East Lansing, MI 48824

Phone#: [phone]

Fax#: [phone]

[e-mail]

ABSTRACT

Flexible pavement design practices have evolved from trial and error to empirical methods and to the latest development of the mechanistic-based AASHTO 2002 procedure. However, due to various constraints and a lack of capability to obtain the engineering characteristics of paving materials, many local agencies will be slow to change and/or to adopt the new methodology.

To alleviate the problem, the AASHTO 2002 procedure should include a transition package that can be used by pavement designers that will ease the change. This paper presents a new methodology that provides a link between the existing and AASHTO 2002 design procedures. The method is based on mechanistic analyses of pavement structures and on pavement performance models. The methodology was developed as a part of a research project sponsored by the Michigan Department of Transportation (MDOT) and conducted by the Pavement Research Center of Excellence (PRCE) at Michigan State University. The study included the characterization of various asphalt mix properties and a comparison between the backcalculated AC layer moduli and the laboratory tested core moduli.

The results of extensive field and laboratory investigations are presented and discussed in this paper. It is shown that it is possible to develop mechanistic-based models that correlate existing design practices to the new AASHTO 2002 design procedure and that the AC moduli obtained from the indirect cyclic load tests are comparable to those obtained from the backcalculation of FWD data.

Key words: Nondestructive deflection test, pavement design, asphalt mix modulus, mechanistic design, and engineering characteristics
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Round-Robin Study For Field Permeability Test

L. Allen Cooley, Jr.

Manager, Southeastern Superpave Center

National Center for Asphalt Technology

277 Technology Parkway

Auburn, AL 36830

Phone: [phone]

Fax: [phone]

Email: [e-mail]

Saeed Maghsoodloo

Professor, Department of Industrial Systems Engineering

Auburn University

210 Dunstan Hall

Auburn University, AL 36849

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Fax: [phone]

Email: [e-mail]