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Mines Magazine Turns 100 - the Timothy and Bernadette Marquez ...

Mines Magazine Turns 100 - the Timothy and Bernadette Marquez ...

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Students Design Award-Winning Sound WallWhen Sue McMahon steps into herbackyard in Lakewood, Colorado,<strong>the</strong>se days, it’s a lot quieter than itused to be. She credits this to anaward-winning sound-wall designedby <strong>Mines</strong> engineering students thathas reduced traffic noise from SixthAvenue that abuts her property.“They researched it, <strong>and</strong> <strong>the</strong>y dida good job,” says McMahon. “This issomething that homeowners can afford,that will look decent <strong>and</strong> will stillwork. We are so excited about this.”In 2001, when <strong>the</strong> speed limit onSixth Avenue was raised, traffic noiseincreased. In 2006, when <strong>the</strong> roadwas repaved, McMahon was ableto convince <strong>the</strong> Colorado Departmentof Transportation to follow <strong>the</strong>suggestion of ano<strong>the</strong>r team of <strong>Mines</strong>engineering students to use a stonematrixasphalt that reduces trafficnoise by about 5 decibels. It helped,but she knew more could be done.With <strong>the</strong> support of Sen. MoeKeller, McMahon secured a $224,000Advanced Technology Grant for constructionof an experimental soundwall that was composed of 15 percentshredded used tires—<strong>the</strong> granttapped into funds from tire recyclingprograms. Since <strong>Mines</strong> students hadcome up with <strong>the</strong> repaving idea,McMahon contacted David Muñoz, anassociate professor of engineering at<strong>Mines</strong>.In 2008, students in <strong>the</strong> two-courseSenior Design class took preconstructionnoise level readings <strong>and</strong><strong>the</strong>n went about designing 750 feetof <strong>the</strong> 1,050-foot sound wall along <strong>the</strong>frontage road. It would be 8 feet high<strong>and</strong> would adjoin a 300-foot-longCDOT sound wall that also incorporatedrecycled tires. Muñoz advised<strong>the</strong> student team, which includedKurtis Greenman ’08, Tony Gargaro’08, Steve Schneiter ’08, TrevorMascovich ’08 <strong>and</strong> Brad Bettag ’08.Bettag says since team memberswere only working on <strong>the</strong> north sideof Sixth Avenue, <strong>the</strong>y worried that<strong>the</strong> wall would amplify sound on <strong>the</strong>south side. “To account for that, wewanted to angle our wall upward ata slight angle to reflect sound overRed Rocks Community College on <strong>the</strong>south side of <strong>the</strong> highway. From <strong>the</strong>rewe incorporated <strong>the</strong> angles in an aes<strong>the</strong>ticallypleasing way <strong>and</strong> alternated<strong>the</strong>m to get some sound cancellation<strong>and</strong> wave interference,” says Bettag.“By thinking one or two steps ahead,we saved <strong>the</strong> city from having to doadditional mitigationon <strong>the</strong> o<strong>the</strong>rside of <strong>the</strong> freeway.”After constructionwascompleted inspring 2010,<strong>the</strong> project,which used3,330 recycledtires, won <strong>the</strong>2010 City ofLakewood CommunitySustainabilityAward.Top to bottom: <strong>the</strong> sound wall viewed from across Rt. 6;rubber content of concrete promotes sound absorption,while non-uniform deflection surfaces diffuse soundwaves <strong>and</strong> direct upward; (left to right) Kurtis Greenman’08, Tony Gargaro ’08, Steve Schneiter ’09, MS ’10, TrevorMascovich ’08, Michael Katz (contractor), Brad Bettag’08, Gary Collaizzi ’70 (assisted with project).—Brenda GillenColo- ra do Schoolof <strong>Mines</strong> 7Photos: Sue McMahon

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