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Two-Lift Paving - Introduction

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A Two-Lift concrete Paving (2LCP) workshop was organized as a part of the Texas Department of Transportation (TxDOT) project 0-6749: Feasibility Study of Two-Lift Concrete Paving (2LCP). This workshop was conducted at the J. J. Pickle Research Campus (PRC), The University of Texas at Austin, Austin, TX on May 23rd, 2013. Dr. Jiong Hu, Texas State University, Research Supervisor, and Dr. David Fowler, The University of Texas at Austin, Co-Research Supervisor, co-chaired the workshop. The workshop offered the option of attending in person or remotely through webinar. Fifty-one attendees were present remotely or in person; 28 in person and 23 persons remotely.

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Two-Lift Paving - Introduction

  1. 1. Two Lift Paving An Overview Dr Peter Taylor With thanks to: Jim Grove FHWA
  2. 2. Two-Lift Paving • What is it? • History in the US • Advantages • Barriers • Where next?
  3. 3. What is it? • Placement of two wet-on-wet layers of concrete
  4. 4. History • Concept is not new Blome Granitoid
  5. 5. History • Europeans learned it from us • We learned it again from them in 1992 and 2006
  6. 6. History • FL 1977 US41 • MI 1993 I75 • KS 1997 Hwy 96 • FL 2001 • KS 2008 I70 • MnRoad 2010 • MO 2011 SH141
  7. 7. Benefits • Lower impact system below • High–end system above • Improved life cycle cost • Improved environmental impact
  8. 8. Benefits • Lower level Aggregates not suitable for surface: Polishing Local!
  9. 9. Benefits • Lower level Recycled materials High SCM contents Lower environmental impact
  10. 10. Benefits • Lower level Strong enough for structural purposes – but no more ~600 psi flex Not necessarily durable
  11. 11. Benefits • Upper level Exposed aggregate finish Quiet Good friction
  12. 12. Benefits • Upper level Special materials TiO2 High durability mix Strength likely higher than needed
  13. 13. Barriers • Two paving trains • Batching control
  14. 14. Barriers • Cost Reportedly initial cost increment can be small LCCA indicates savings • Specifications IL Tollway • Experience There is a learning curve
  15. 15. Where next? • It is common in Europe • Have to address: Fear The learning curve Specifications

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