Sustainable Land Development Today - June 2008 - (Page 13)

“To circumvent that, states like Florida developed their own process that was similar but different enough to not violate any patents,” he said. Other states looked at the dry process, which happened to originate in Sweden, where they used larger pieces of rubber as an aggregate in the hot mix. Kent Hansen is director of engineering for the National Asphalt Pavement Association and was in the asphalt rubber industry at that time. “I think the problem was (rubberized pavement) was forced down the throat of many state DOTs, so they tried to scramble to see if they could make something work. They didn’t have a lot of luck,” he said. The best results came in cases where state agencies had a chance to build on experience and know what mixes worked best. “Possible errors occurred early when they tried to use rubberized asphalt in standard, dense graded mixes. We found it works best in gap-graded and opengraded mixes,” Hansen said. Gapgraded mixes are those where an amount of the sand in the standard hot mix was taken out, which allows more asphalt rubber binder into the mix. The open-graded mix contains same-sized stone for aggregate and is used as porous pavement. The ISTEA era created a great disfavor toward rubber technology, according to Carlson. Many tried the dry process or tried to use a regular dense graded mix, like standard hot mix and swap out the binders. Instead of using neat asphalt, they’d use rubberized asphalt. “None of the materials had good quality control or design. It was very hard to get a uniform material placed throughout the length of a project,” he said. THE Alternative Before and after 3D site design renderings using Carlson Civil by The Engineering Groupe, Inc., www.enggroupe.com “ We were able to make adjustments to the building sites and roads on the fly with the software, which turned out to be a huge cost savings for our clients. It makes us look good and is a big reason they keep teaming up with us. — Jason Towery, PE Project Manager, The Engineering Groupe Inc. ” INTRODUCING THE CARLSON CIVIL SUITE 2009 CIVIL SURVEY HYDROLOGY GIS – the CADD solution that Simply WORKS Find out more NOW! email civil@carlsonsw.com, call 800-989-5028, visit www.carlsonsw.com ® Authorized IntelliCAD Technology Consortium Member ® © Copyright 2008 Carlson Software, Inc. All rights reserved. Carlson Software is a registered trademark of Carlson Software, Inc. All other product names or trademarks belong to their respective holders. Circle 130 • or www.SLDTonline.com/webcard www.SLDTonline.com 13 http://www.enggroupe.com http://www.carlsonsw.com http://www.carlsonsw.com http://www.SLDTonline.com/webcard http://www.SLDTonline.com

Table of Contents Feed for the Digital Edition of Sustainable Land Development Today - June 2008

Sustainable Land Development Today - June 2008 Contents Our Voice Editorial Board SLDT Resources Where Rubber Meets the Road Integrated Planning: The Key To Developing Sustainable Planned Communities Win-Win For College and Community Industry Spotlight: Transoft Unique Organization, Unique Opportunity New Preferred Provider Comments from the Austin Conference Welcome New Members New Knowledge Project Articles Books Going Green Business Management Risk Management Surveying and Mapping Industry News Products/Services Showcase Advertiser Index Classifieds The Last Word

Sustainable Land Development Today - June 2008

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