NORTHEAST ASPHALT USER / PRODUCER GROUP NORTHEAST ASPHALT USER / - - PowerPoint PPT Presentation

NORTHEAST ASPHALT USER / PRODUCER GROUP NORTHEAST ASPHALT USER / PRODUCER GROUP

Maryland Specification for Using Contractor and Agency Test Results in a Computer-based Pay Factor Program

Larry Michael – MDSHA

• Maryland’s Goals
• QC/QA Specification
• MarylandWare
• Pay Factor Program
• HMA View
• Pavement Tools Consortium
• Maryland’s Goals
• QC/QA Specification
• MarylandWare
• Pay Factor Program
• HMA View
• Pavement Tools Consortium

Maryland’s Goals Maryland’s Goals

Track HMA Projects Life Cycle Costs QC/QA Specification Incorporating Contractor and State Results Computer Based Track HMA Projects Life Cycle Costs QC/QA Specification Incorporating Contractor and State Results Computer Based

QC/QA Specifications QC/QA Specifications

• Mixture
• Density
• Random Sampling
• Mixture
• Density
• Random Sampling

MIXTURE MIXTURE

QA Sample Location: Behind the Paver QA Sample Location: Behind the Paver QC Frequency: As approved in QC plan. Sampling may be from trucks or BTP. QC Frequency: As approved in QC plan. Sampling may be from trucks or BTP. QA Frequency - minimum of 1/day/mix or 1/1000 tons; whichever yields higher frequency. QA Frequency - minimum of 1/day/mix or 1/1000 tons; whichever yields higher frequency. No incentive No incentive

NEW SPEC NEW SPEC

Lot size: 6000 tons Lot size: 6000 tons QA test compared to QC by MSMT 733, t & F tests. If comparable, QC & QA results will be combined to determine final pay factor. If not, only State results will be used. QA test compared to QC by MSMT 733, t & F tests. If comparable, QC & QA results will be combined to determine final pay factor. If not, only State results will be used.

DENSITY DENSITY

QC - one test per 500 tons or 5 per day QA - one core required per 500 tons or 5 per day QA core results used to develop pay factors. QC core results may be used as well. Testing frequency based on paving

• production. Use Behind Paver Gravities

Pay adjustments by lot based on average density and minimum value Incentive allowed QC - core or nuclear testing

NEW SPEC

t & F tests used for Acceptance / Pay

No Sublot Below

No Sublot Below

MD Materials Database MD Materials Database

Pavement Design Information Pavement Design Information Project Inventory Information Project Inventory Information Pavement Performance Data Pavement Performance Data HMA Mix Design and QC/QA Data HMA Mix Design and QC/QA Data Construction Details Construction Details Ride Quality Data Ride Quality Data Asphalt Binder QA Data Asphalt Binder QA Data

Gloria Burke

HMAview Homepage - choose the project you wish to view. HMAview Homepage Homepage -

• choose the project

choose the project you wish to view. you wish to view.

From pavement design files From pavement design files From pavement design files

Image from thermal camera Image from Image from thermal thermal camera camera

Shows all locations sampled Shows all Shows all locations locations sampled sampled

Close-up view

• f sample

location (Click

• n pushpin for

details Close Close-

• up view

up view

• f sample
• f sample

location (Click location (Click

• n pushpin for
• n pushpin for

details details

DATA ANALYSIS: Future addition to OMT’s database DATA ANALYSIS: Future DATA ANALYSIS: Future addition to addition to OMT OMT’ ’s s database database

DATA ANALYSIS: Future addition to OMT’s database DATA ANALYSIS: Future DATA ANALYSIS: Future addition to addition to OMT OMT’ ’s s database database

What’s Next?

HMA Pooled Fund Consortium A private-public partnership to further develop and use computer-based pavement tools: HMA View Database Interactive Pavement Training Computer Simulations Distance Learning

Questions?

Thank You!