METRANS

11-21 Investigation of Fracture Properties of California Asphalt Concrete Mixtures

Project Number

11-21

Project Summary

Investigation of Fracture Properties of California Asphalt Concrete Mixtures

Project Status

Complete

Project Report

Project Brief

Year

2011

Topic Area

Infrastructure

P.I. Name & Address

Assistant Professor, Department of Civil Engineering and Construction Engineering Management; College of Engineering
California State University Long Beach
1250 Bellflower Blvd.
VEC-205
Long Beach, CA 90840
United States
Shadi.Saadeh@csulb.edu

Project Objective:

California Department of Transportation (Caltrans) had recently adapted the mechanistic empirical pavement design method to replace the older Hveem method. The University of California Pavement Research Center (UCPRC) is currently developing a mechanistic empirical pavement design method CalME, Kohler et al (2006). The program will predict the performance of flexible pavement based on the engineering properties of its constituents. The major distresses that are addressed for the flexible pavement are rutting, fatigue cracking and low temperature cracking. In their effort to predict the material performance, UCPRC is conducting several performance tests on asphalt concrete mixtures that are used in California. In addition, they are developing constitutive models to predict the material performance under several loading conditions.

This research will address the fracture properties of 16 California asphalt mixtures that are used in the development and calibration of CalME. UCPRC had conducted and in the process of conducting Beam Fatigue tests (BFT) on these mixtures. After communication with the researchers at UCPRC they indicated that further investigation of the fracture properties using monotonic loading (using SCB) is needed for comprehensive characterization (the attached letter of participation). The objective of this research is to investigate the fracture properties of California asphalt concrete using monotonic loading by Semi Circular Bend test. The SCB test will add valuable input to the development and calibration of CalME.

The experimental factorial will include mixtures with different properties including, five open-graded types of mixtures, two rubberized hot mix asphalt – gap graded (RHMA-G) and polymer modified mixtures, and nine rubberized warm mix asphalt – gap graded (RWMA-G) mixtures. The SCB test will be conducted on all these mixtures. The fracture properties for some of these mixtures will be further investigated for the model calibration.

Task Descriptions
(1) Literature review
(2) Preparation of test specimens
(3) Conduct laboratory experiments
(4) Data analysis
(5) Draft final report

Milestones, Dates:
(1) August 2010 – October 2010
(2) October 2010 – November 2010
(3) November 2010 – February 2011
(4) March 2011 – June 2011
(5) May 2011 – July 2011

Total Budget:
$89,976

Student Involvement:
One graduate student at 50% effort for 9 months

Relationship to Other Research Projects:
10-24 part of the infrastructure focus area

Technology Transfer Activities:
Project report will be posted soon

Potential Benefits of the Project:
Support for the University of California Pavement Research Center (UCPRC) mechanistic empirical pavement design method, CalME

TRB Keywords:
Highways, Materials, Pavements

Primary Subject:
1p.2 To address the fracture properties of 16 California asphalt mixtures that are used in the development and calibration of CalME.