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2007-07-19 News Release
Latex helps asphalt roads last longer Warm mix asphalt roads can last years longer thanks to Butonal NX 1138 styrene-butadiene latex from BASF and Evotherm technology.
McAsphalt Industries Limited of Toronto, Ontario, Canada, in conjunction with King Paving of Burlington, Ontario, recently repaved a north section of Garth Street in Hamilton, Ontario, to demonstrate to Hamilton’s public works department key benefits of a new asphalt road technology. “This innovative technology from MeadWestvaco Corporation called Evotherm** warm-mix asphalt provides an outstanding package of benefits to the environment and the public,” said Keith Davidson, Director of Technical Services for McAsphalt (www.mcasphalt.com). “Using it, we can make roads that should last longer and use less energy doing it. In addition, since we can work and place the asphalt at 240°F, as opposed to 325°F for conventional asphalt, the operation emits fewer volatile organic compounds (VOCs) and odors. Using this technology the public benefits from fewer traffic delays from roadwork and less impact on the environment.”
“High temperatures make asphalt brittle and age prematurely, said Koichi Takamura, Senior Research Associate in BASF’s Charlotte Technical Center in North Carolina. “The ability to work the asphalt at lower temperature, made possible by use of Evotherm warm-mix technology and enhanced by BASF’s Butonal* NX 1138 styrene-butadiene latex, is the reason that the warm mix asphalt road can last years longer.” BASF research shows that by using latex modified Evotherm, the asphalt plant mixing and application temperatures are lowered and result in less oxidative aging and heat hardening of the asphalt binder in the mix. This work also suggests that the use of Evotherm warm mix emulsion instead of hot asphalt cement could provide an additional two to five years of service life to a road. This trial is part of a repaving effort by the City of Hamilton on the north and south lanes of Garth Street. McAsphalt has repaved the two north lanes using conventional hot mix asphalt cement and the two south lanes using the Evotherm warm mix technology employing BASF’s Butonal NX 1138 styrene-butadiene latex.
In order to compare the two technologies, the city of Hamilton has hired an asphalt expert to study how well the new surface performs. McAsphalt also plans to study this road over time. At the end of the study, the University of Waterloo and McAsphalt’s Keith Davidson will do a life cycle cost analysis to demonstrate the value of this technology. “We believe that this test will clearly demonstrate that the asphalt
warm-mix road lasts significantly longer, has fewer longitudinal joints
that open up, and cost less over its life,” said Davidson. “Combined
with the environmental and energy benefits, this technology is a win for
everyone.” Chemicals Engineer Jobs - Post Employment Opportunity!
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