Behind the Screed

2012 NAPA RAP/RAS/WMA Survey

Are you a U.S.-based asphalt mix producer? Has your company submitted its information about RAP/RAS/WMA usage during the 2012 construction season yet? NAPA and FHWA are still looking for information from producers about the use of recycled materials and warm mix. All data submitted is used only for the survey and no information will be released about individual producers. We'd like to see participation by all U.S. asphalt mix producers, and your participation helps the industry. Here's the link for the survey: http://goaspha.lt/2012RAPRASWMA

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Evotherm in Asphalt Rubber Equals Hassle-Free Construction

All American Asphalt (Corona, CA) recently completed a ramp overlay project for Caltrans near Los Angeles, CA. The project included the overlay of several ramps on the Interstate 405 corridor just south of the LAX International Airport. The paving occurred at night to minimize the disruption to the travelling public, approximately 300,000 Average Annual Daily Traffic or AADT. A late season rain storm delayed the project a couple of days and lowered overnight temperatures to the 50’s. Even so, All American Asphalt achieved proper compaction with minimal placement issues.

Caltrans identified this project as a “pilot” for their evaluation of the new Superpave specification, which they plan to implement in 2014 in lieu of the Hveem mix design process. This project was the first to include a Superpave mix design for a mix that includes Asphalt Rubber by incorporating 20% ground tire rubber.

All American Asphalt produced the mix just under 300F and hauled it from Irvine, CA, to the jobsite in 90 minutes. The mix temperature was at 240F when they began breakdown rolling. Finish rolling was completed before the mix dropped below 130F.

Caltrans is currently reviewing the project QC and QA results and using this information to fine tune their Superpave specification prior to full implementation next year.

     

Author: Brandon Milar

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Winning Bike Path at 11,000 feet

Congratulations to Columbine Hills Concrete and Asphalt Inc for winning the 2012 Colorado Asphalt Pavement Association award for Best Special Project. The Vail Pass Recreational Trail Project in CDOT District 3 was designed to improve the riding surface, drainage, erosion control, signage and safety while minimizing the maintenance costs and environmental impacts of the path. This eight mile section of path is located at elevations ranging from 8,000-11,000’ and experiences extreme weather conditions that can cause damage to the asphalt at a higher than average rate. The resurfacing portion of the project included approximately 8 miles of an 1-1/2” overlay of the existing path. The project was given 25 days to complete and the path could not be closed Friday – Sunday. Incentives were received on all material and construction quality testing of the 7,415 tons of asphalt – SX 75 PG 58-28 at 20% RAP and using Evotherm warm mix asphalt technology. The mix was produced by Everist Materials of Silverthorne, CO. Judges noted the paving uniformity and smooth ride as excellent!

Source: Colorado Asphalt Pavement Association

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Dragon Boat Time!

This year we braved  the wind and rain to make the Charleston Dragon Boat festival a success.  Mother Nature didn't cooperate one bit this year for practices or race day! We still put three boats on the water once again anyway. All three boats made a great showing this year.  The current got a little crazy but we managed to still have some good runs and have some fun (checkout our Facebook album).  The Chemical Crusaders took 9th in the A Division, the Warriors to 2nd in the B Division, and the Brawlers (party barge!) took 4th in the D Division.

Best of all the Charleston Dragon Boat festival raised $146,359 for cancer survivor programs. Paddles Up!

Sunshine State Approval

This week Florida Department of Transportation's (FDOT) State Materials Office reviewed recent data in respect to Evotherm's M1 warm mix technology and added it to their approved list of warm mix technologies. Evotherm is also approved as a liquid anti-strip for granite mixtures. Contractors throughout the state are adopting Evotherm technology this year to get better adhesion and compaction, to increase recycled content, to reduce thermal segregation, to reach long-haul jobsites, and to lower fuel costs. Contact your Technical Marketing Manager or evotherm@mwv.com to put Evotherm to work for you.

 

Infrastructure Value in India

GR Infrastructure has selected Evotherm warm mix asphalt technology for use on a four-lane, 44 kilometer stretch of National Highway 11 connecting Reengus to Sikar in the state of Rajasthan, India. Approximately half of the 300,000 metric ton project will be paved this year using Evotherm in the surface and binder (DBM) layers. Major benefits observed on this project for the National Highway Authority of India include:

• A 30% increase in production rate through the batch plant pug mill
• A 25% decrease in fuel usage
• Easy compaction to target density
• Improved adhesion and elimination of aggregate stripping

The contractor is pleased with the performance of Evotherm. Based on these results GR Infrastructure has expanded their use of Evotherm to additional project work throughout India.

 

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