I-80; Silvercreek Junction to Wanship, Utah Joe Serre and Cody - PowerPoint PPT Presentation

I-80; Silvercreek Junction to Wanship, Utah Joe Serre and Cody Preston Geneva Rock Products, Inc.

 Elevation  Weather Conditions  Traffic  Existing Condition of Road and Sub Base  Budget

 7.55 Miles  2-12 ft. lanes each direction with 4 ft. and 10 ft shoulders  Existing asphalt surface  377,500 SY of CTAB with PCCP overlay  Project start June 2014 – completion October 2015  Eastbound complete in 2014 with Holcim Type II/V Cement  Westbound completed in 2015 with Holcim Envirocore Cement

 Cross sections included 4 in. CTAB and 12 in. PCCP  Contract required 9% to 11% cement content  UCS values between 300 – 500 PSI at 7 Days  Moist cure for 72 hrs or until prime coat applied  No construction traffic for 72 hrs

Mill set to bottom of CTAB layer Excess tailing moved to areas lacking Shaping done by 3D guided equipment

Test strips done at 7%, 8%, 9% cement content Delivered in Bulk Transferred to spreading machine Spread dry

Rotomill mixed dry cement into milled asphalt and added water Actual cement content to meet strength requirements was 7%

Sheepsfoot roller 3D Guided Grader Smoothdrum roller

Water cured until prime coat application Placed Enviroprime prime coat Ready for PCCP

 Mainline 12 in. thick PCCP over 4 in. CTAB  Ramps 10 in. thick PCCP over 4 in. CTAB

Held up well under construction traffic Yield loss compared to aggregate base Can’t adjust elevation easily

 2014 Standard C150 Type II/V  2015 Envirocore C1157 Type MS

 Duplicated mix design with different cements  Trial batch results were similar  Holcim II/V: 5980 PSI Mix design  Envirocore: 5710 PSI Trial Batches Field Performance  Field Performance  2014: Holcim Type II/V 5109 PSI Average  2015: Holcim Envirocore 4985 PSI Average

 Allow ample time for CTAB test strips  Must be able to drive on CTAB earlier than 72 hours.  The longer you can wait to place prime coat, the less ruts will form.  After 2 days no chance of shaping CTAB  Envirocore cement performs similar to standard cement