PRODUCTIVITY plus QUALITY CONTROL by ProQuest

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									PAVING INNOVATIONS




PRODUCTIVITY plus
      QUALITY CONTROL




Available technology helps smooth the path to compaction specs
By Kim Berndtson




T
          echnology designed to help      tion monitoring. As early as the         typically will get a higher degree of
          you achieve your soil and       1980s, Europeans were using these        rebound and a higher reading,” notes
          asphalt compaction objec-       systems to help determine the effec-     Dave Dennison, BOMAG Americas.
          tives has made tremendous       tiveness of the compaction process.         This information can be used by
          headway in recent years,        Similar systems began appearing in       an intelligent compaction roller — a
and is continuing to evolve at a rela-    the U.S. earlier this decade.            roller equipped with a documenta-
tively rapid pace. Its ultimate goal is      At the heart of onboard compac-       tion and feedback system — to auto-
to quantify density on the run — i.e.,    tion monitors is an accelerometer that   matically adjust parameters such as
identify density in real time under       measures the response or rebound of      vibration direction. The roller opera-
the roller.                               the drum in respect to the frame.        tor can also use the stiffness data to
   While the technology isn’t quite          This measurement allows a stiff-      determine at what point to conduct
there yet, there are several options      ness value to be displayed and cor-      traditional sonic and nuclear density
currently available that can help you     related to density. (It’s important to   tests and spot core tests.
quickly and effectively reach target      note that stiffness is not the same as      “Currently this new technology
densities.                                density.)                                needs to be used in conjunction with
                                             For example, loose, lightly com-      existing density tests,” says Denni-
Monitoring soil stiffness                 pacted soil or asphalt will have a       son. “We’re not at a point where it
   Soil compaction has essentially        smaller response or rebound. “As         can replace those tests. It’s another
led the way with onboard compac-          you make successive passes, you          quality control tool contractors can

30   asphalt contractor • www.asphalt.com • February 2010
PAVING INNOVATIONS




GPS mapping technology, such             Mapping a clearer picture
as Caterpillar’s AccuGrade                                                        ing technologies and grade con-
Compaction GPS Mapping                       GPS mapping systems are also         trol systems, including the analysis
and Monitoring System, lets              becoming more accepted on compac-    
								
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