Two-Lift Paving - Environmental Performance
Upcoming SlideShare
Loading in...5
×
 

Two-Lift Paving - Environmental Performance

on

  • 189 views

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 ...

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.

Statistics

Views

Total Views
189
Views on SlideShare
189
Embed Views
0

Actions

Likes
0
Downloads
6
Comments
0

0 Embeds 0

No embeds

Accessibility

Upload Details

Uploaded via as Adobe PDF

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

Two-Lift Paving - Environmental Performance Two-Lift Paving - Environmental Performance Presentation Transcript

  • UT - Two-Life Pavement workshop, Environmental benefits, Austin TX 05-2013 Environmental benefits of two-lift pavement A quantitative perspective based on life cycle assessment (LCA) Joep Meijer President of theRightenvironment In collaboration with the CP Tech Center
  • UT - Two-Life Pavement workshop, Environmental benefits, Austin TX 05-2013 Topics 1. What is LCA? 2. Our experience 3. Two-lift case 4. What’s next
  • UT - Two-Life Pavement workshop, Environmental benefits, Austin TX 05-2013 Life cycle assessment (LCA) LCA is a powerful tool for assessing the environmental performance of products, services or scenarios It is based on material and energy flows for processes and materials that together form a life cycle Resource A Resource B Production Assembly Use Maintenance Recycling
  • UT - Two-Life Pavement workshop, Environmental benefits, Austin TX 05-2013 Life cycle assessment (LCA) We use world-leading software and databases and apply ISO standards - ISO 14041 Goal and Scope Definition - ISO 14042 Inventory Analysis - ISO 14043 Interpretation - ISO 14044 Guidelines and principles - ISO 14025 Type III environmental declarations
  • UT - Two-Life Pavement workshop, Environmental benefits, Austin TX 05-2013 Goal and Scope Functional unit: what is to be assessed in terms of: - Amount - Unit - Functions - Requirements - Geographical considerations - Timeframe
  • UT - Two-Life Pavement workshop, Environmental benefits, Austin TX 05-2013 Inventory
  • UT - Two-Life Pavement workshop, Environmental benefits, Austin TX 05-2013 Impact Assessment A range of impact categories • global warming (CO2-eq) • depletion of non-renewables (Sb-eq) • depletion of the ozone layer (CFC-11-eq) • Acidification (SO2-eq) • Eutrophication (PO4 3--eq) • Summersmog (Ethylene-eq) • aquatic ecotoxicity (CTUea) • terrrestrial ecotoxicity (CTUet) • human toxicity (CUTh) • Energy (MJ) • non-hazardous waste (kg) • hazardous waste (kg) • …
  • UT - Two-Life Pavement workshop, Environmental benefits, Austin TX 05-2013 Impact Assessment The result is an Environmental profile
  • UT - Two-Life Pavement workshop, Environmental benefits, Austin TX 05-2013 Interpretation Major contributions give options for improvements
  • UT - Two-Life Pavement workshop, Environmental benefits, Austin TX 05-2013 Two-lift Kansas Comparison of: 1. Traditional 2. Two-lift 3. Optimized two-lift Together with Tom Van Dam, APTech Gary Fick, Trinity Construction Management Peter Taylor, CP Tech Center
  • UT - Two-Life Pavement workshop, Environmental benefits, Austin TX 05-2013 Two-lift Kansas Functional unit The material acquisition and construction of 1 km of a two lane highway with a total width of 7.4 m according to KDOT requirements in Kansas
  • UT - Two-Life Pavement workshop, Environmental benefits, Austin TX 05-2013 Two-lift Kansas 3.7 m 3.7 m Conventional concrete with a thickness of 340 mm 150 mm Cement Treated Base Traditional 3.7 m 3.7 m Tie bar: deformed No. 5 reinforcing bar (Grade 30), 915 mm long, spaced every 760 mm across the longitudinal contraction joint, formed by saw cutting D/3 Lower-lift of concrete with a thickness of 300 mm 150 mm Cement Treated Base Top-lift of concrete with a thickness of 40 Two-lift
  • UT - Two-Life Pavement workshop, Environmental benefits, Austin TX 05-2013 System boundaries
  • UT - Two-Life Pavement workshop, Environmental benefits, Austin TX 05-2013 Two-lift Kansas Key differences 1. Traditional • Primary aggregate from OK for PCC • Portland cement 2. Two-lift (same plus) • CTB secondary aggregates on-site crusher • Part fly ash in CTB and top lift 3. Optimized two-lift (same plus) • CTB and bottom lift on-site crusher • Fly ash in bottom lift
  • UT - Two-Life Pavement workshop, Environmental benefits, Austin TX 05-2013 Two-lift Kansas Limitations • Average European data for materials, processes, allocation parameters • “just” material acquisition and construction Look for relative differences not numbers
  • UT - Two-Life Pavement workshop, Environmental benefits, Austin TX 05-2013 Comparison Significant 1. Traditional 2. Two-lift 3. Optimized
  • UT - Two-Life Pavement workshop, Environmental benefits, Austin TX 05-2013 All recycling off-site, no on-site recycling Sensitivity analysis Significant
  • UT - Two-Life Pavement workshop, Environmental benefits, Austin TX 05-2013 Comparison Significant 1. Traditional 2. Two-lift 3. Optimized
  • UT - Two-Life Pavement workshop, Environmental benefits, Austin TX 05-2013 Sensitivity analysis All primary aggregates local, no recycled aggregate Significant
  • UT - Two-Life Pavement workshop, Environmental benefits, Austin TX 05-2013 Conclusions • Two-lift shows great potential • Reducing clinker content is a sound strategy • Recycling pays off • Optimizing logistics matters • With equal distances for primary and secondary aggregates, handling proves to be discriminating (quarry vs. on-site or off-site recycling)
  • UT - Two-Life Pavement workshop, Environmental benefits, Austin TX 05-2013 LCA related lessons/limitations • Always look at more than 1 indicator , not just energy(trade-offs) • Do not forget we did not look at all life cycle stages (trade-offs) • Always look for sensitivity analyses to test the robustness of certain parameters or assumptions • We need more US based data
  • UT - Two-Life Pavement workshop, Environmental benefits, Austin TX 05-2013 Next steps • Develop a framework • Expand on current efforts to make a concrete and cement US database • Feed with primary data • Perform case studies
  • UT - Two-Life Pavement workshop, Environmental benefits, Austin TX 05-2013 Environmental benefits of two-lift pavement A quantitative perspective based on life cycle assessment (LCA) Joep Meijer President of theRightenvironment