Transcript I-80 Solano Long Lif..

Construction of LLP HMA Pavements
Pre-bid Meeting
Solano 80; 04-4A0104
District 4
Oakland , CA
September 14, 2012
Bob Humer
Caltrans Contract
Solano Project 04-4A0104
Pavement Cross Section
Pavement Cross Section
Structural Sections
Overview
Special Requirements
Project LLP Mix Designs
Construction
Successes
Special Requirements
This project includes special testing
requirements for the mix design of HMA
See section 10-1.41, "Hot Mix Asphalt
(Long Life)" of the Special Provisions for
the special testing requirements.
This testing will take significantly longer
than the testing specified in Section 391.03, "Hot Mix Asphalt Mix Design
Requirements," of the Standard
Specifications.
Special Requirements
10-1.41, "Hot Mix Asphalt (Long Life)“
– Prepaving conference shall be held no more
that 30 days following approval of the
contract.
– Review special provisions for those required
to attend.
– If a party cannot attend this mandatory
meeting at the time scheduled, the meeting
will be delayed until such time as all parties
can be present, or the meeting will be
repeated with all parties present.
Solano Project 04-4A0104
Specification Section 10-1.41 “Hot Mix Asphalt (Long
Life)” Required Mix Designs
– HMA (15% Max RAP, Long Life) PG 64-28PM
– HMA (25% RAP, Long Life) PG 64-10
• You may request in writing to the Engineer to use
a “softer” PG binder to meet the Performance
requirements
• *HMA mixes must meet permanent deformation,
fatigue, stiffness, and Hamburg wheel tracking
test requirements.
*HMA aggregates must be treated with Lime
(Marination)
LLP Structural Section
Solano Project (Main line)
0.1’ HMA –O
0.2’ HMA (15% Max. RAP Long Life)
(PG 64-28PM)
0.25’ HMA (25% RAP Long Life)
(PG 64-10)
GPI*
NTS


HMA (leveling course) (PG 64-10)
Existing Cracked & Seated PCC or HMA
* GeoSynthetic Pavement Interlayer / Fabric
2 LLP Mix
Designs!!!
Long Life Pavement Projects
Quantity of Materials Per Mix Design
Caltrans Project
Preliminary Mix Design
(includes CT 371)
Typical
Long Life
5 gal binder
~500 lb aggregate
5 gal binder
~500 lb aggregate
Performance Testing
(includes specimen
fabrication)
Shear
Fatigue
Hamburg
10 gal binder
~ 1,200 lb aggregate
Long Life Pavement Projects
Estimated Time Per Mix Design
Caltrans Project
Preliminary Mix Design
(includes CT 371)
Typical
Long Life
3 weeks
3 weeks
Performance Testing
(includes specimen
fabrication)
Shear
Fatigue
Hamburg
~ 3 weeks
~ 6 weeks
~ 1 week
LLP Mix Design Process
Make every effort to insure that consistent
and uniform virgin aggregates are available
for use on entire project.
Collect sufficient aggregates, virgin and
RAP, during mix design process for mix
design testing.
Allow a minimum of 3 weeks for each HMA
preliminary mix design.
Allow a minimum of 10 to 12 weeks per mix
design for performance testing.
HMA Performance Testing
Performance tests required for this project
are very different from the usual HMA tests.
Few labs in the nation can perform these
tests.
HMA Performance Testing
Three labs listed in the Special Provisions can
perform HMA performance tests for this project:
– University of California Pavement Research Center
(UC-PRC), Richmond, CA
– Advanced Asphalt Technologies (AAT), Sterling, VA
– The Asphalt Institute, Lexington, KY
Construction of LLP HMA
Binder content range during production
Job Mix Formula Target Value ±0.3%.
Compaction of LLP HMA during
production to 94% - 97% of Maximum
Theoretical Density (Gmm).
Consistency, Consistency, Consistency
Successes on Previous LLP
Sufficient Number of Quality Control Staff
– Timely test data are essential.
– Qualified personnel that understand field
operations and can quickly interpret
laboratory test data.
Successes on Previous LLP
Staging and Contingency Plans
Establishing a good working platform
on which to pave.
Successes on Previous LLP
Effective Communication
These projects are a true Partnership
between the Contractor and Caltrans.