Asphalt Specification Changes July 2005

Asphalt Specification ChangesAsphalt Specification Changes July 2005 July 2005

Contractor Asphalt TrainingContractor Asphalt Training

Rich Hewitt, PERich Hewitt, PEDistrict Bituminous EngineerDistrict Bituminous Engineer

District Five Materials & ResearchDistrict Five Materials & Research


What are we going to talk about?What are we going to talk about? Background & General InformationBackground & General Information Specifics on 334 Changes…a bunch!Specifics on 334 Changes…a bunch! Specifics on 337 Changes…a few!Specifics on 337 Changes…a few! Specifics on 234 Changes…one slide!Specifics on 234 Changes…one slide! Questions & DiscussionQuestions & Discussion


CQC Asphalt Specification Task TeamCQC Asphalt Specification Task Team Industry, FHWA, FDOTIndustry, FHWA, FDOT Fall 2004Fall 2004

Statistical evaluation of dataStatistical evaluation of data Review significant changes to…Review significant changes to…

334 Superpave Asphalt Concrete334 Superpave Asphalt Concrete 337 Asphalt Concrete Friction Courses337 Asphalt Concrete Friction Courses 234 Superpave Asphalt Base234 Superpave Asphalt Base

Asphalt Specification ChangesAsphalt Specification Changes Section 334 Section 334

General reorganization:General reorganization:• 334-1 Description334-1 Description• 334-2 Materials334-2 Materials• 334-3 General Composition of Mixture334-3 General Composition of Mixture• 334-4 Contractor Process Control334-4 Contractor Process Control• 334-5 Acceptance of the Mixture334-5 Acceptance of the Mixture• 334-6 Comparison Testing334-6 Comparison Testing• 334-7 Method of Measurement334-7 Method of Measurement• 334-8 Basis of Payment334-8 Basis of Payment


334-5 Acceptance of the Mixture334-5 Acceptance of the Mixture• 334-5.1 General334-5.1 General• 334-5.2 Lot Sizes334-5.2 Lot Sizes• 334-5.3 Initial Production Requirements334-5.3 Initial Production Requirements• 334-5.4 Quality Control Sampling and Testing334-5.4 Quality Control Sampling and Testing• 334-5.5 Verification Testing334-5.5 Verification Testing• 334-5.6 Resolution System334-5.6 Resolution System• 334-5.7 Independent Sample Verification Testing334-5.7 Independent Sample Verification Testing• 334-5.8 Surface Tolerance334-5.8 Surface Tolerance• 334-5.9 Minimum Acceptable Quality Levels334-5.9 Minimum Acceptable Quality Levels


334-1.4 Thickness334-1.4 Thickness Specify thickness instead of spread rateSpecify thickness instead of spread rate

Old: 200 lbs/ydOld: 200 lbs/yd22

New: 2 inchesNew: 2 inches Control based on spread rateControl based on spread rate

Convert thickness to spread rate:Convert thickness to spread rate: Spread rate (lbs/ydSpread rate (lbs/yd22) ) = t x G= t x Gmmmm x 43.3 x 43.3

Plan quantities based on GPlan quantities based on Gmmmm of 2.540 of 2.540 Approximately 110 lbs/ydApproximately 110 lbs/yd2 2 – granite mix– granite mix


334-1.4.Thickness334-1.4.Thickness Fine Mixes (Nearest ½ inch)Fine Mixes (Nearest ½ inch)

Type SP-9.5Type SP-9.5 1 – 1½ inches1 – 1½ inches Type SP-12.5Type SP-12.5 1½ - 2½ inches 1½ - 2½ inches Type SP-19.0Type SP-19.0 2 - 3 inches2 - 3 inches

Permits two layers of SP-9.5 (fine)Permits two layers of SP-9.5 (fine) StackingStacking

Can’t use SP-9.5 (fine) on Traffic Level D & ECan’t use SP-9.5 (fine) on Traffic Level D & E


334-1.4.Thickness334-1.4.Thickness Coarse Mixes (Nearest ½ inch)Coarse Mixes (Nearest ½ inch)

Type SP-9.5Type SP-9.5 1½ - 2 inches1½ - 2 inches Type SP-12.5Type SP-12.5 2 - 3 inches 2 - 3 inches Type SP-19.0Type SP-19.0 3 - 3 ½ inches3 - 3 ½ inches


334-2.2 Superpave Asphalt Binder: 334-2.2 Superpave Asphalt Binder: PG 67-22 – Standard Binder GradePG 67-22 – Standard Binder Grade Traffic Level D – PG 76-22 top structural layerTraffic Level D – PG 76-22 top structural layer

PG 76-22 is polymer modifiedPG 76-22 is polymer modified Traffic Level E – PG 76-22 top Traffic Level E – PG 76-22 top twotwo structural structural

layerslayers 334-3.2 Mix Design:334-3.2 Mix Design:

3 mix designs/NMAS/traffic level/3 mix designs/NMAS/traffic level/binder binder gradegrade/contract year /contract year

Coarse and fine allowed for Coarse and fine allowed for allall Traffic Levels Traffic Levels

Asphalt Specification Asphalt Specification ChangesChanges

Section 334 Section 334 334-4 Process Control334-4 Process Control

Address in QC Plan how PC failures will be Address in QC Plan how PC failures will be handledhandled

Basically need to address problem, then resampleBasically need to address problem, then resample Second failure stop production, contact EngineerSecond failure stop production, contact Engineer

334-5.1.2 Acceptance Testing Exceptions:334-5.1.2 Acceptance Testing Exceptions: Less than 500 tons of any mix type, visual Less than 500 tons of any mix type, visual

inspectioninspection Engineer Engineer maymay require PC tests or IV tests require PC tests or IV tests


Section 334 Section 334 334-5.2 Lot Sizes334-5.2 Lot Sizes

If a Lot is terminated on QC failure, Lot If a Lot is terminated on QC failure, Lot sizes go to 2000 tonssizes go to 2000 tons

Partial Lots will not be redefinedPartial Lots will not be redefined 334-5.4.4 Individual Test Tolerances 334-5.4.4 Individual Test Tolerances

for Quality Control Testing: for Quality Control Testing: Revised Master Production RangeRevised Master Production Range


Section 334 Section 334Table 334-4Table 334-4Master Production RangeMaster Production Range

CharacteristicCharacteristic Tolerance (1)Tolerance (1)

Asphalt Binder Content ( percent)Asphalt Binder Content ( percent) Target ± 0.55Target ± 0.55

Passing No. 8 [2.36 mm] Sieve ( percent)Passing No. 8 [2.36 mm] Sieve ( percent) Target ± 5.50Target ± 5.50

Passing No. 200 [75 µm] Sieve ( percent)Passing No. 200 [75 µm] Sieve ( percent) Target ± 1.50Target ± 1.50

Air Voids ( percent) Coarse GradedAir Voids ( percent) Coarse Graded 2.00 – 6.00 2.00 – 6.00 widerwider

Air Voids ( percent) Fine GradedAir Voids ( percent) Fine Graded 2.30 – 6.00 2.30 – 6.00 widerwider

Density, percent GDensity, percent Gmm mm (2)(2)

Coarse Graded (minimum)Coarse Graded (minimum) 93.0093.00

Fine Graded (minimum)Fine Graded (minimum) 90.00 90.00 newnew

(1) Tolerances for sample size of n = 1 from the verified mix design(1) Tolerances for sample size of n = 1 from the verified mix design(2) Based on an average of 5 randomly located cores(2) Based on an average of 5 randomly located cores


Section 334 Section 334 334-5.4.4 Individual Test Tolerances for 334-5.4.4 Individual Test Tolerances for

Quality Control Testing:Quality Control Testing: Added single density value < 91.00%Added single density value < 91.00%

Coarse mixesCoarse mixes Single low density value – correct problemSingle low density value – correct problem Two in same sublot - stopTwo in same sublot - stop

Any Lot terminated on QC failure is limited to a Any Lot terminated on QC failure is limited to a maximum pay factor of 1.00 per characteristicmaximum pay factor of 1.00 per characteristic

334-5.5 Verification Testing:334-5.5 Verification Testing: Single non-comparison Single non-comparison → Resolution→ Resolution


Section 334 Section 334 334-5.6.3 Resolution Determination:334-5.6.3 Resolution Determination:

No additional time grantedNo additional time granted 334-5.9.5 Defective Material: 334-5.9.5 Defective Material:

““Cleaned up”Cleaned up” Better describes actual processBetter describes actual process Allows delineation testingAllows delineation testing


Section 334 Section 334 334-8.2 Pay Factors:334-8.2 Pay Factors:

Modified Small Quantity Pay TableModified Small Quantity Pay Table Modified PWL Spec LimitsModified PWL Spec Limits

Table 334-7Specification Limits

Quality Characteristic Specification Limits

Passing No. 8 [2.36 mm] sieve ( percent) Target ± 3.1

Passing No. 200 [75 m] sieve ( percent) Target ± 1.0

Asphalt Content ( percent) Target ± 0.40

Air Voids – Coarse Mixes ( percent) 4.00 ± 1.40

Air Voids – Fine Mixes ( percent) 4.00 ± 1.20 tightertighter

Density – Coarse Mixes ( percent of Gmm): 94.50 ± 1.30

Density – Fine Mixes ( percent of Gmm): 93.00 + 2.00, - 1.20 (1) widerwider

Note (1): If the Engineer (or Contract Documents) limits compaction to the static mode only, the specification limits are as follows: 92.00 + 3.00, -1.20. No additional compensation, cost or time, shall be made.

Asphalt Specification ChangesAsphalt Specification Changes Section 337Section 337

Asphalt Concrete Friction CoursesAsphalt Concrete Friction Courses

337-2.2 Asphalt Binder: 337-2.2 Asphalt Binder: Use PG 76-22 when called for in Contract, Use PG 76-22 when called for in Contract,

otherwise ARBotherwise ARB 337-6.2.1 Individual Test Tolerances for 337-6.2.1 Individual Test Tolerances for

FC-5 Production: FC-5 Production: Single binder content out = stopSingle binder content out = stop Two out on gradation = stopTwo out on gradation = stop Address IAW “Defective Material”Address IAW “Defective Material”

Note:Note: 334-9.4 no longer exists, 334-5.9.5 was 334-9.4 no longer exists, 334-5.9.5 was intended.intended.


337-8 Thickness of Friction Courses 337-8 Thickness of Friction Courses FC-9.5 & FC-12.5: use 334-1.4FC-9.5 & FC-12.5: use 334-1.4

Spread rate (lbs/ydSpread rate (lbs/yd22) = t x G) = t x Gmmmm x 43.3 x 43.3 FC-5:FC-5:

Spread rate (lbs/ydSpread rate (lbs/yd22) = t x G) = t x Gsbsb x 40.5 x 40.5 GGsbsb= combined aggregate bulk specific gravity of the verified = combined aggregate bulk specific gravity of the verified

mix designmix design Plan quantities based on GPlan quantities based on Gsbsb of 2.635 of 2.635

Spread rate of 80 lbs/ydSpread rate of 80 lbs/yd22

337-9.3 Hydrated Lime Pretreatment: 337-9.3 Hydrated Lime Pretreatment: Allow lime pretreated aggregateAllow lime pretreated aggregate 45-day window for use after pretreatment45-day window for use after pretreatment Spec addresses QC and certification requirements for Spec addresses QC and certification requirements for

blending operationsblending operations

Asphalt Specification ChangesAsphalt Specification Changes Section 234Section 234

Superpave Asphalt Base Superpave Asphalt Base

234-8 Thickness Requirements. 234-8 Thickness Requirements. Convert thickness to spread rate:Convert thickness to spread rate:

Spread rate (lbs/ydSpread rate (lbs/yd22) = t x G) = t x Gmmmm x 43.3 x 43.3

Questions?Questions?

Asphalt Specification Changes July 2005

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