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Intelligent Compaction for Subgrades and Structural Layers AASHTO RAC High Value Research Workshop July 27, 2011

Intelligent Compaction for Subgrades and Structural Layers AASHTO RAC High Value Research Workshop July 27, 2011. Intelligent Compaction for Subgrades and Structural Layers Overview. Intelligent compaction is a promising construction technique under evaluation by several states.

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Intelligent Compaction for Subgrades and Structural Layers AASHTO RAC High Value Research Workshop July 27, 2011

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  1. Intelligent Compactionfor Subgrades and Structural Layers AASHTO RAC High ValueResearch Workshop July 27, 2011

  2. Intelligent Compaction for Subgrades and Structural LayersOverview Intelligent compaction is a promising construction technique under evaluation by several states • Vibratory rollers are equipped to measure position, speed and drum vibration • Data are processed and displayed in real time as a color-coded map of stiffness

  3. Intelligent Compaction for Subgrades and Structural LayersGoals and methods • Evaluate IC on highway projects for bound and unbound layers • Low- and high-plastic clay subgrades • Silty sand subbases • Crushed aggregate and recycledasphalt base courses • Asphalt overlays • Determine accuracy ofIC measurements througha variety of field tests

  4. Intelligent Compaction for Subgrades and Structural LayersFindings Results were promising • For unbound materials, IC is effective to map stiffness and identify weak areas prior to placement of new layers • IC helps determine best rolling patterns for unbound layers and avoid over-rolling But challenges remain • IC is not used for hot-mix asphalt finishing rollers yet • Stiffness readings are influenced by supporting layers; adjustment factors or other field controls are needed • Output values from different manufacturers’ equipment need to become more uniform

  5. Intelligent Compaction for Subgrades and Structural LayersOutlook With further research, IC has the potential to lower construction costs, improve the uniformity of compaction, and increase pavement performance and service life.

  6. Intelligent Compaction for Subgrades and Structural LayersFor more information • Wisconsin Highway Research Program project 0092-08-07, Evaluation of Intelligent Compaction Technology for Densification of Roadway Subgrades and Structural Layers • http://www.whrp.org/research-areas/geotechnics/geotechnics_0092-08-07.html • Daniel Yehdaniel.yeh@dot.wi.gov(608) 267-6977

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