More Articles for HMA

Plant Management of RAP/RCA

Better Roads Staff - Nov 06, 2013

Plant Management of RAP/RCA

Processing and storage makes reclaimed asphalt pavement and recycled concrete aggregate useful as aggregate.   By Tom Kuennen, Contributing Editor   In the past two decades, reclaimed asphalt pavement (RAP) and recycled concrete aggregate (RCA) have taken their places among materials commonly used for ...

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The Durability Factor

Better Roads Staff - Aug 07, 2013

The Durability Factor

The goal is performance over time Design durable roads and you are designing them “not to fail.” A variety of tools now exists that civil engineers can use to design pavements that will stand up to traffic and the elements, optimizing long-term ...

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Beware Premature Aging of Binder

Better Roads Staff - Jun 06, 2013

Beware Premature  Aging of Binder

Take care with liquid asphalt binder to avoid thermal crack failure   Thermal cracking – also known as low temperature cracking – in bituminous pavements appears as a series of transverse cracks that extend across the pavement surface in response to cold ...

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To Prevent Failure, Begin with Better Bases

Better Roads Staff - May 06, 2013

To Prevent Failure,  Begin with Better Bases

Fatigue cracking usually links to inadequate road foundations By Tom Kuennen, Contributing Editor Fatigue cracking in bituminous pavements is experienced by the public so often that it is considered just part of driving. Motorists endure it and assume it’s just part of ...

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Cracking Cold

Better Roads Staff - Feb 17, 2012

Cracking Cold

Solving the Riddle of RAP and Thermal Cracking   By Tom Kuennen, Contributing Editor Use of reclaimed asphalt pavement (RAP) in hot-, warm- and cold-mix asphalt is growing dramatically, as tests validate its use in ever-increasing quantities. But there are fears that higher quantities ...

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RoadScience

Brooke Wisdom - Apr 01, 2011

RoadScience

Research that could change the Way We Work Some top picks from Transportation Research Board’s papers presented at its 90th annual meeting in D.C. By Tom Kuennen, Contributing Editor It is always a meeting filled with new ideas and stunning research breakthroughs in ...

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INDOT new paving specs allow more RAP

Tina Grady Barbaccia - Apr 22, 2010

In honor of Earth Day, the Indiana Department of Transportation (INDOT) announces new paving specifications that allow for additional use of recycled materials. By increasing the amount of reclaimed asphalt pavement and recycled roofing shingles within asphalt mixes, INDOT anticipates ...

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Proper Placement of Breakdown Compactors

Tina Grady Barbaccia - Nov 17, 2009

by Dale Starry,  director of strategic technologies, Volvo Construction Equipment There is debate about how closely behind the paver the breakdown compactor should roll during hot-mix asphalt (HMA) laydown. Some industry experts suggest the breakdown compactor needs to nearly bump the paver ...

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