01379123

Component

http://www.trb.org/Main/Blurbs/167500.aspx

http://www.trb.org/Publications/Blurbs/167500.aspx

Asphalt rubber (AR) chip seals are normally more capable of resisting reflective cracking and more durable than conventional seal coat. However, the AR chip seal has very high production and construction placement temperatures. The temperature of mixing binder with crumb rubber modifiers ranges from 350°F to 425°F. The binder application temperatures are normally more than 350°F. The odor from tire rubber and emissions is also high. Adding warm-mix additives to the AR for the spray application can result in many advantages, including reduced odors, decreased emissions, and potential fuel savings. In 2010, three AR chip seal with warm-mix projects were placed in northern, central, and southern California, respectively. The binder placement temperatures were lowered about 45°F to 60°F, which significantly reduced emission, smoke, and odor. In California, the use of a warm-mix additive also eliminates the requirement of a special hood for conventional AR chip seal application required to meet U.S. Environmental Protection Agency emission regulations. The long-term performance of adding warm-mix additive to the AR chip seal application still needs to be evaluated. After 1 year of study, the initial results of using AR chip seal with warm-mix additives are promising. Several more AR chip seals with warm-mix additive projects were placed in California in 2011, and it is expected more will be placed again in 2012.

01379113

MMC12-145

English

pp 13-23

2012-7

Transportation Research Circular

2012 AASHTO–TRB Maintenance Management Conference

Web

Maps; Photos; References; Tables

Asphalt rubber; Chip seals; Pavement maintenance; Pollutants; Warm mix paving mixtures

Emissions control

California

Highways; Maintenance and Preservation; Pavements; I61: Equipment and Maintenance Methods

TRIS, TRB

Jul 30 2012 7:51AM

• Best Practices in Highway Maintenance Performance Measuring
• Bridge Element Deterioration and Life Expectancy in Florida and Virginia
• Effective Use of Structural Health Monitoring for Highway Bridge Maintenance
• Equipment Mechanic Training and Certification
• Level of Service Ranking Using the Percent-Within-Limits Measure
• Optimization Model for Pavement Maintenance Planning and Resource Allocation
• Performance-Based Maintenance and Operations Management
• Use of Automatic Vehicle Location Systems, Geographic Information Systems, and Global Positioning Systems to Increase Efficiencies and Decrease Cost in Maintenance Management
• Using Automated Pavement Condition Measurements to Indicate Appropriate Pavement Preservation and Maintenance Options
• Wet-Night Visibility of Pavement Markings: Research and Test Methods