Appendix 3-4

January 31, 2018

Asphalt Mixture Verification Responsibilities

Duty

Task

Performed By / REQ’D. CERT.

Minimum Frequency

1.  Verify Aggregate Gradation.

·        Direct and witness contractor sampling and splitting of cold feed combined aggregate.

·        Secure and identify split sample for delivery to District Lab or take possession of split sample.

Construction

HMA SAMPLER

& AGG. I

First Day and Weekly Thereafter

·        Test combined aggregate sample for gradation.

·        Compare results to contractor test results per IM 216.

·        Report validation results.

District Materials or Construction

AGG. II

First Day and Weekly Thereafter

·        Investigate validation issues.

District Materials

As Needed

2.  Verify Aggregate Quality.

·        Obtain independent sample. 

·        Send sample to Office of Materials with documentation.

District Materials

AGG. I

1/20,000 Tons

3.  Verify Asphalt Binder Quality.

·        Direct and witness contractor sampling of asphalt binder.

·        Secure and identify sample for delivery to District Lab.

Construction

HMA SAMPLER

1/Day

·        Test asphalt binder samples on DSR.

·        Report binder test results.

District Materials

First Day then 1/Week

·        Obtain binder sample from the pumping line with assistance from the contractor. 

·        Send sample to Office of Materials with documentation.

District Materials

HMA SAMPLER

1/20,000 Tons

4.  Verify Uncompacted Mixture Properties.

·        Select random sample locations.

·        Direct and witness contractor paired sampling of uncompacted mix as per IM 322 and IM 511.

·        Secure and identify one of each paired sample for delivery to District Lab.

Construction

HMA SAMPLER

1/Sublot

·        Randomly select paired sample for testing.

·        Test selected sample for required mix properties.

·        Compare results to contractor test results per IM 216.

·        Report validation results.

District Materials

HMA I

Asphalt Mixture Properties: 1/Day

 

Extracted Gradation:

First Day and 20% Thereafter

·        Investigate validation issues.

District Materials

As Needed

 

 

Asphalt Mixture Verification Responsibilities

Duty

Task

Performed By / REQ’D. CERT.

Minimum Frequency

5.  Verify Compacted Pavement Properties.

·        Select random sample locations.

·        Direct and witness contractor coring.

·        Inspect cores for damage and thickness and direct replacement coring of damaged or unusable cores.

·        Take possession of cores and transport to the contractors lab or secure core samples if contractor is transporting the cores.

·        Measure cores for thickness.

·        Test cores for density and record weights.

·        Provide copy of thickness and weights to contractor for reporting.

Construction

HMA SAMPLER

8 Mat Cores/Lot

 

0, 2 or 3 Joint Cores / Lot (based on matched length)

 

·        Select random sections for smoothness testing.

·        Perform independent smoothness testing.

·        Compare results to contractor test results per IM 216.

·        Report validation results.

District Materials

PROFILOMETER

10% of Project

·        Investigate validation issues.

District Materials

As Needed

 

 

Asphalt Mixture Independent Assurance Responsibilities

Duty

Task

Performed By / REQ’D. CERT.

Minimum Frequency

1.  Aggregate Gradation Independent Assurance.

·        Systematically distribute aggregate proficiency samples to contractor technicians who perform QC gradation testing for acceptance and construction technicians who perform verification gradation testing per IM 205.

o   Contractor and Construction certified technicians who perform gradation testing must pick up, test and report results of samples to the Central Lab approximately every three months.

·        Record sample ID numbers and receiver for each sample distributed.

District Materials

Monthly

2. Asphalt Mixture Independent Assurance.

·        Systematically distribute Asphalt Mixture proficiency samples to contractor technicians performing QMA testing of Asphalt Mixture per IM 205.

o   Contractor certified technicians who perform Asphalt Mixture testing must pick up, test and report results of samples to the Central Lab approximately every three months.

·        Record sample ID numbers and receiver for each sample distributed.

District Materials

Monthly

3.  Core Density Independent Assurance.

·        Retest one set of cores for density and thickness.

·        Compare results to construction technician test results.

·        Report comparison of test results.

District Materials

HMA SAMPLER

1/Project

 

 

Other Required Asphalt Mixture Acceptance Responsibilities

Duty

Task

Performed By / REQ’D. CERT.

Minimum Frequency

1.  Qualify Laboratory.

·        Check condition of test equipment.

·        Check equipment calibration records.

·        Check for current test methods.

District Materials

HMA I

Every Two Years

2.  Observe Plant Calibration.

·        Check for proper procedures per IM 508.

·        Check for approved JMF.

·        Check stockpile certifications.

·        Check plant settings.

District Materials

HMA I

As Per DME

3.  Materials Certifications.

·        Check for approved aggregate sources.

·        Check certified aggregate truck tickets.

·        Check for approved asphalt binder source.

·        Check certified asphalt binder truck tickets.

·        Check for approved release agents per IM 491.15.

District Materials

HMA I

Check at Time of Calibration and

When Material Changes

4.  Documentation.

 

·        Review plant calibration.

·        Review job mix formulas.

District Materials

HMA II

At Startup of Each Mix

·        Review entries in the Daily Plant Report.

·        Review entries in Plant Program for pay quantities and PWL.

Construction

HMA I

First Day and

Weekly Thereafter

·        Review quality control charts.

·        Review PWL data.

District Materials

HMA I

Weekly

·        Obtain files of project documentation:

o   Daily Plant Reports

o   Correlation Summary Sheets

o   Quality Control Charts

o   Delivery Tickets

o   Submitted Forms

Construction

At End of Project

5.  Inspect Stockpiles.

·        Observe stockpiling procedures per IM 508.

·        Check for segregation.

·        Check for contamination.

·        Check for intermingling of stockpiles.

District Materials

HMA I

First Day and

Weekly Thereafter

 

 

Other Required Asphalt Mixture Acceptance Responsibilities

Duty

Task

Performed By / REQ’D. CERT.

Minimum Frequency

6.  Aggregate Proportioning.

·        Inspect method of securing cold-feed bin gate settings.

·        Monitor actual cold-feed gate and belt speed settings.

·        Monitor aggregate proportions.

·        Monitor interlocks.

District Materials

HMA I

At Startup and

When Problems Arise

7.  Plant Operations.

·        Observe coating of aggregates.

·        Observe mixing time (batch plant).

·        Prevent segregation:

o   Observe truck loading.

o   Observe level of mix in the silo.

o   Observe operation of hopper/silo gates.

District Materials or Construction

HMA I

At Startup and

When Problems Arise

·        Monitor trucks for improper use of cleaning fluids per specification 2001.01.

District Materials or Construction

HMA I

At Startup and

Weekly Thereafter

8.  Plant Adjustments.

·        Participate in discussion of mix design adjustments.

·        Document proportion changes.

District Materials

HMA II

Each Occurrence

9.  Inspect Plant Facility.

·        Check if lab qualification is current.

·        Check for all required test equipment.

·        Check for computer, fax, copier, and phone.

District Materials

HMA I

At Startup

10.  Check Weighing Equipment.

·        Monitor check weighing.

·        Monitor verification weighing.

·        Monitor sensitivity check.

Construction

HMA I

First Day and

Weekly Thereafter

·        Witness truck tare weighing at random.

Construction

HMA I

Once Per Project

11.  Asphalt Binder Quantity Determination.

 

·        Witness the In-Line Flow Meter calibration.

·        Monitor tank sticking procedures, when used for making asphalt binder yield checks.

Construction

HMA I

 

First Day and

Weekly Thereafter