HMA 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 Only

·         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 Only

·         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

HMA Properties: 1/Day

 

Extracted Gradation:         First Day and 20% Thereafter

·         Investigate validation issues.

District Materials

As Needed

 

HMA 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 Cores/Lot

·         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

 

 

HMA 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. HMA Independent Assurance.

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

o    Contractor certified technicians who perform HMA 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 HMA 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

·         Review entries in Plant Book for certified quantities of materials.

Construction

HMA I

Weekly

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 the Plant Book.

·         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 HMA 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

Once Per Week Thereafter

·         Witness truck tare weighing at random.

Construction

HMA I

Once Per Project

11.  Asphalt Binder Quantity Determination.

 

·         Monitor tank sticking procedures.

·         Witness the 4-hour meter calibration if In-Line Flow Meter is being used for asphalt binder quantity.

Construction

HMA I

 

First Day and

 Weekly Thereafter