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Standard Practice To Develop a Quality Control/Quality Assurance Plan …spave/old/Technical...
Transcript of Standard Practice To Develop a Quality Control/Quality Assurance Plan …spave/old/Technical...
Name Says It All
Standard PracticeTo Develop a
Quality Control/Quality Assurance Plan for HMA
Significance
• Quality Control Plan for Contractor• Quality Assurance Plan for SHA
LABORATORIES
• AMRL Proficiency and Inspection• OR
• State Sponsored Program• Plus
• Qualified Personnel (Contractor and SHA)
STATE HIGHWAY AGENCY RESPONSIBILITIES
• Review Contractor Design• Review Contractor Quality Control
Program• Quality Assurance Testing
CONTRACTOR RESPONSIBILITIES
• Perform Designs
• Develop QC Plan
• Execute QC Plan
MIX DESIGN FORMULA ADJUSTMENT
• First Lot to Dial Mixture In• Amount of Adjustment Allowed
Mix Composition Property AdjustmentLimit
Asphalt Binder Content (Pb) +/- 0.4
Gradation Passing 4.75 mm
and Larger Sieves
+/- 4.0
Gradation minus 2.36 mm to
0.150 mm Sieve
+/- 4.0
Gradation minus 0.075 mm Sieve +/- 1.5
Voids Mineral Aggregate (VMA) +/- 1.0
Voids Filled with Asphalt (VFA) +/- 5.0
MIX DESIGN FORMULA ADJUSTMENT
• Job Mix Formula (JMF) to be declared at end of lot
• JMF must meet MP-2
MIX PRODUCTION STOPPED IF
• Air voids >2.0% from target in one sub-lot• Air voids >1.5% from target in two sub-lots• Percent AC >0.5% from target in sub-lot• Any other property >2 times value in table
in one sub-lot• Any other property > value in table in two
sub-lots
EXAMPLE
• % Air = 4% <2.0%, >6.0% in one<2.5%, >5.5% in two
• %AC = 5.4% <5.0%, >5.8% in one
• % #8 = 31% <23%, >39% in one<27%, >35% in two
• %VMA = 14.6% <12.6%, >16.6% in one<13.6%, >15.6% in two
INITIAL PRODUCTION ACCEPTANCE
• IF OKAccept mix with pay factor 1.00
• IF STOPSHA determine value of mix
PLANT SAMPLES
• Two Methods
• from mat behind paver (random X and Y)• from truck (random ton)
ROAD
• Test Strip500 feet min
• Peak Densitynon-destructive gage
• Core Strip get offset from gage
QUALITY CONTROL SYSTEM
• Minimum Properties – %AC– Gmm– % Air Voids– % VMA– % VFA– Moisture Content– % passing key sieves
PROJECT SPECIFIC
• Personnel• Plant Operations• Transportation• Roadway Operations• Compaction Equipment
QUALITY ASSURANCE
• Mixture Properties Typically– %AC– % Air Voids– % VMA
STATISTICALY BASEDACCEPTANCE
• PWL using Standard Deviation• PWL using Conformal Index• Mean and Range
IN PLACE DENSITY
• 2 cores (or non-destructive test) / sub-lot
SMOOTHNESS
• Use a method
SEGREGATION
• Consider a Method
CONTRACTOR ACCEPTANCE
• Included Independent Verification• SHA have statistical method to compare
APPENDICES
• Random Sampling• Control Charts• Quality Control Requirements• PWL with Standard Deviation• PWL with Conformal Index• Mean and Range• Example Specification