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Intelligent Compaction

Intelligent Compaction. Understanding the Technology. Jimmy Si, Ph.D., P.E. Austin, TX, April 3, 2014. Table of Contents. 1. Why Use Intelligent Compaction. 3-5. 2. TXDOT IC Projects. 6-9. 3. Benefits and Challenges. 10 -11. 4. Future Plans. 12. 5. Summary. 13. Why Use IC?.

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Intelligent Compaction

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  1. Intelligent Compaction Understanding the Technology Jimmy Si, Ph.D., P.E. Austin, TX, April 3, 2014

  2. Table of Contents 1 Why Use Intelligent Compaction 3-5 2 TXDOT IC Projects 6-9 3 Benefits and Challenges 10-11 4 Future Plans 12 5 Summary 13

  3. Why Use IC? Ordinary Compaction Density Control • CompactiveEnergy • Moisture Content • Material Type • Compact Lift Thickness • Underlying Conditions

  4. Why Use IC? Can We Do A Better Job? Not used in pavement design A layer-specific spot test providing no info on the uniformity of compaction over the entire section Only measured after compaction is complete providing no feedback in real time

  5. Before After Why Use IC? • Lose the track of rolling pass counts • Compaction job becomes guesswork • Inconsistent and non-uniform density • Under/over compaction • Premature pavement failure

  6. TxDOT IC Projects Fort Worth (7) FM156; US287 ; FM1938; FM731; SH267; IH35W; andIH30 Amarillo (1) LP335 Paris (2) US75 SH24 El Paso (1) FM1281 Atlanta (1) FM450 Houston (1) SH35

  7. FM156 Project Dynapacsingle smooth drum IC roller Ammann/Case smooth drum IC roller Ammann/Case padfoot drum IC roller FM156, Fort Worth, TX FHWA/TPF IC Study SG, Lime Stabilized SG, and Flex Base

  8. FM156 Project – Identify Soft Spots Ks shows compaction progress and a soft spot Case/Ammann single-drum padfoot IC roller Screen shots of kSΙPD maps for different passes on TB 1

  9. FM156 Project – IC vs. Conventional Tests LWD FWD DCP

  10. Benefits • Covers 100% of the area compacted • Monitors pass counts • Identifies areas of poor compaction • Intelligently picks areas to test for QC/QA • Improves productivity and minimizes cost • Improves safety in construction zones

  11. Challenges Extensive training for DOT and contractors • FHWA training workshops Data management difficulties • VEDA More expensive than ordinary • IC retrofit kit High moisture variation No strong correlation b/w stiffness and density

  12. Future Plans • Workshops/Webinars and pilot projects in districts • Revise IC specification • Short Term: density based on IC proof mapping • Long Term: stiffness based on IC proof mapping

  13. Summary IC is a continuous compaction control process. IC is only for QC so far. IC measures stiffness, not density. IC reports both stiffness and pass count. IC does not measure moisture. IC measurements are sensitive to moisture. IC improves safety in construction zones.

  14. Thank You! Questions? Jimmy Si, Ph.D., P.E. 512-506-5901 Jimmy.Si@txdot.gov

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