Review 2014 HMA test data Review Changes to CS 409 (2015) Discuss 2015 Bit DEL changes Protocol for Reheating HMA Samples Verification Data – 2014 / 2015

40 different JMF’s◦ 14 had PWL of 90% or greater◦ 26 needed Design rework

12 different Producers 19 different plants VMA – PWL average was 83%

Total Lots - 602 100% payment – 528 (88%) 97% payment – 35 (6%) R&R – 26 Lots (4%)◦ 13 Removed and Replaced◦ 8 LIP (50%) payment◦ 3 LIP (0%) payment◦ 2 LIP (100%) payment

High AC – 2 Low AC – 5 High #200 – 0 Low #200 – 0 High Air voids – 28 Low Air voids – 34 Low Density – 11 Average Density – 94.3

(b)1. General Requirements ……Include minimum 90% manufactured sand in the fine aggregate portion of the bituminous mixture.

(e) 1. Virgin Material Mixtures.…..Design Va on 25mm Rich Bottom mixes at 2.5% at Ndes through the addition of AC to an approved PTC 25mm design

……At the end of the production season a copy of the Bit-DEL QC and Acceptance software shall be transferred electronically to the Commission’s Materials Supervisor and become the property of the Commission.

(e) 1.e.1 If the average loose material sample test results fail to meet 100% payment values listed in Table I on 3 consecutive production days for AC percentage, No. 200 sieve gradation, Va, or the minimum VMA tolerance noted below, cease production of the JMF

…….When the Gmm value varies by 0.030 or more from the previous test or from the JMF value for three consecutive tests, cease production of the JMF. Investigate the reason for the deviation, provide a written explanation for the deviation as well as proposed corrective action to the Commissions Material’s Supervisor before continuing production.

Producers volumeters used in HMA testing shall be assigned a specific identification number. The volumeter identification number must be engraved or stamped into the base and lid of each volumeter. Anytime a volumeter is used for PTC mix design or acceptance testing purposes, any recalibration of the volumeter must be witnessed by a Commission Representative.

Acceptance by certification is appropriate for the following conditions or applications: Production of 150 tons or less Scratch or leveling course material Other mixtures, conditions or applications as approved by the Representative

2a General

2.b Certification of Mixture2.c Maintaining Approval to Certify Mixtures.The PTC may suspend a plant’s approval to certify mixtures if QC testing is not performed according to the producer’s QC Plan, mixtures are not produced according to Bulletin 27 or a mixture cannot be certified on 2 consecutive production days.2.d Density Acceptance. Density for certified material will be accepted by section 409.3(j)2 or 409.3(j)3

(c) Bituminous Mixing Plant.ELIMINATED >>>>> Location of bituminous mixing plants must be within 40 miles or one hour travel time for delivery vehicles.

Use steel-wheel, pneumatic-tire, vibratory, or oscillating rollers as specified or allowed in Section 108.05(c) 3 or 4. Operate rollers according to manufacturer’s recommendations. Use vibratory and oscillating rollers with separate controls for frequency and amplitude.Eliminated >> Three-Wheel Power Rollers.

……Also apply a tack coat to the base or binder course of newly constructed pavements when in the opinion of the Representative, the surface is not satisfactory for direct placement of paving. Provide the Representative with the anticipated shift tonnage for placement.

……When a widener is used to place the HMA mixture, the loose material sample may be obtained from the hopper of the widener.

The Inspector will complete PTC Form SB 413 with the necessary information and place the form in a water tight envelope (provided by the producer) inside a container of sufficient strength to prevent samples from being damaged during transport. If the samples show any evidence of their security being compromised, the Commission may reject them for testing, suspend paving operations and require additional samples to be taken for acceptance.

……Reduce the sample according to AASHTO R47 Section 7 Mechanical Splitter Method A 7.1, utilizing a quick funnel insert into appropriate sizes for testing asphalt content/gradation (percent passing the No. 200 sieve), maximum specific gravity, and two gyratory specimens.

A lot will be 1,500 tons or portion thereof, with two equal sublots (n=2).

Each sublot will have 3 loose box samples and 3 pavement cores collected according to PTM 1, PTM 729 and PTM 746 in the presence of the Inspector.

Each lot will be specific to a JMF and each HMA producing plant, if multiple plants are used.

Each lot will be specific to each paving crew if more than one crew is used.

At locations selected by the Representative and in the presence of the Representative, drill a minimum of three 6-inch diameter cores from the area of pattern segregation marking the samples as S (Segregated) and a minimum of three cores from the pavement representing a non-segregated area marking the samples NS (Non-Segregated) . The Representative will transport the cores to the producer’s laboratory and transfer custody of the cores to the Commission’s plant inspector.

…..If samples are damaged, immediately notify the Inspector. If directed by the Inspector, obtain replacement samples from within 12” of the original sample location. The Inspector will complete the necessary information on PTC Form RC 426 and place the form in a water tight envelope (provided by the producer) inside the same container……If the samples show any evidence of their security being compromised, the Commission may reject them for testing, suspend paving operations and require additional samples to be taken for acceptance.

…..For quality control purposes, a maximum of one pavement core per shift may be obtained. No cores may be taken by the Contractor after the acceptance cores are obtained.

1.a General…..Before placing abutting lanes, paint the entire face of the joint with a uniform coating of bituminous material, the PG-Binder used in the pavement course or PG 64-22. …Seal all completed wearing surface longitudinal and transverse joints with rubberized joint sealing material meeting ASTM D6690-Type I from a manufacturer in Bulletin 15 as specified in Section 705.4(c). The sealing band must be 4” to 6” in width evenly applied across the joint.

PROGRESS….

NOT PERFECTION !!!!

PTCBit – DEL 2015-A

Revisions

2014 Bit‐DEL

2015 Bit‐DEL

During the 2014 construction season some of our HMA producers questioned the practice of reheating the loose mixture samples taken from the roadway for acceptance. The real issue being the Air Void replication of the mixture.

However the issue is greater than just air voids. It’s really about mixture sampling, how the mixture is reheated, mixture conditioning, how the samples are split, and then gyrated.

It became apparent that how the loose HMA mixture, from the roadway, was being handled in the labs when reheated for acceptance testing, varied between each producer and sometimes between the different HMA testing labs/ plant locations from a particular HMA producer.

A review of HMA specifications from the 22 states, that use roadway loose samples, for acceptance testing, was done. Attention was given to the reheating protocol that each of the states mandated. Again some variations in protocol was noted but many of the practices were the similar.

Also considered was a report/study by the National Center for Asphalt Technology – NCAT at Auburn University entitled “Effects of Re-heating and Compaction Temperature on Hot-Mix Asphalt Volumetrics.”

2. c. Mixture Acceptance Sample Testing. The HMA loose samplesshould be at room temperature prior to commencement of the testing procedure.The HMA technician shall remove the loose mix sample from the cardboard boxand place into a suitable pan for reheating. The technician shall reheat the threeloose samples for each sub-lot using a forced draft oven, thermostaticallycontrolled, calibrated and capable of maintaining any desired temperature settingfrom room temperature to 349°F + 3°F. The pan containing the mixture may becovered to assist in the reheating process. The maximum oven temperature shallbe the maximum mixture temperature for the PG binder of the mixture beingtested as specified in Bulletin 25, page 1. At no time during the reheating processshould the temperature of the sample exceed the PG binder maximumtemperature. If different PG binder mixtures are being reheated in the same oven,at the same time, use the lowest maximum temperature of the PG binders beingtested as specified in Bulletin 25, as the maximum temperature set point for theoven.

When the mixture is workable, blend the three samples into onehomogeneous sample. Split the sample according to AASHTO R47, section 7Mechanical splitter method A 7.1, utilizing a quick funnel insert into appropriatesizes for testing asphalt content / gradation, (percent passing No. 200 sieve),maximum specific gravity and two gyratory specimens. Place the loose samplematerial to be used for the Gmb plugs back into the oven to be heated to thecompaction temperature listed on the supplier’s bill of lading. Stir the mixture atthe midpoint of the reheating process to ensure even heating of the mix. The pancontaining the mixture may be covered to assist in the reheating process. The testresults of the loose material will be used as the criteria for payment according toTable I. All acceptance testing shall be performed according to the AASHTO andBulletin 27 procedures as specified.

Bulletin 25, page 1

Oven Maximum Temperature Set Point Guide Line

2014 (114) / 2015 (50)

25m – 19 / 12 19mm – 47 / 16 12.5mm – 32 / 15 9.5mm – 16 / 7

2014 Mix Verifications                                    2015 Mix Verifications                                   

25mm      2014

25mm   ‐ 19 mixes verified

25mm      2015

25mm   ‐ 12 mixes verified to date

Average Variation Between Producer and 

Mobile Lab

Variation Spread

Average Variation Between Producer and 

Mobile Lab

Variation Spread

Min Variation

Max Variation

Min Variation

Max Variation

1 1/2 0 0 0 1 1/2 0 0 0

1 1 ‐1 2 1 1 ‐1 2

3/4 1 ‐3 3 3/4 1 0 3

1/2 1 ‐1 5 1/2 1 ‐1 2

3/8 1 ‐3 5 3/8 1 ‐2 4

#4 1 ‐2 2 #4 1 ‐2 6

#8 1 ‐2 1 #8 1 ‐2 2

#16 1 ‐2 0 #16 1 ‐1 2

#30 1 ‐2 1 #30 1 ‐1 1

#50 1 ‐2 1 #50 1 ‐1 0

#100 1 ‐1 1 #100 1 ‐1 1

#200 0.2 ‐6 0.4 #200 0.3 ‐0.6 0.7

Asphalt 0.1 ‐4 0.2 Asphalt 0.1 ‐0.2 0.1

Gmm 0.004 ‐0.013 0.004 Gmm 0.002 ‐0.011 0.003

Voids 0.2 ‐0.6 0.04 Voids 0.1 ‐0.4 0.2

VMA 0.2 ‐0.3 0.05 VMA 0.1 ‐0.3 0.1

19mm      2014

19mm   ‐ 47 mixes verified

19mm      2015

19mm   ‐ 16 mixes verified to date

Average Variation Between Producer and 

Mobile Lab

Variation Spread

Average Variation Between Producer and 

Mobile Lab

Variation Spread

Min Variation

Max Variation

Min Variation

Max Variation

1 0 0 0 1 0 0 0

3/4 1 ‐1 2 3/4 1 ‐1 3

1/2 1 ‐1 8 1/2 2 ‐2 4

3/8 1 ‐3 4 3/8 1 ‐2 2

#4 1 ‐7 3 #4 1 ‐6 3

#8 1 ‐5 4 #8 1 ‐2 2

#16 1 ‐4 3 #16 1 ‐4 2

#30 1 ‐5 1 #30 1 ‐4 0

#50 1 ‐5 0 #50 1 ‐3 0

#100 1 ‐3 0 #100 1 ‐4 0

#200 0.3 ‐1.3 0.7 #200 0.4 ‐0.7 0.9

Asphalt 0.2 ‐1.0 0.6 Asphalt 0.2 0.6 0.1

Gmm 0.004 ‐0.014 0.013 Gmm 0.004 ‐0.010 0.006

Voids 0.2 ‐0.3 0.5 Voids 0.13 0.2 0.3

VMA 0.2 ‐0.6 1.2 VMA 0.16 0.3 0.4

12.5mm    2014

12.5mm   ‐ 32 mixes verified

12.5mm    2015

12.5mm   ‐ 15 mixes verified to date

Average Variation Between Producer and 

Mobile Lab

Variation Spread

Average Variation Between Producer and 

Mobile Lab

Variation Spread

Min Variation

Max Variation

Min Variation

Max Variation

3/4 0 0 0 3/4 0 0 0

1/2 1 ‐1 7 1/2 1 ‐1 2

3/8 1 ‐2 6 3/8 1 ‐1 4

#4 1 ‐3 1 #4 2 ‐11 4

#8 1 ‐2 1 #8 2 ‐9 4

#16 1 ‐2 1 #16 1 ‐4 7

#30 1 ‐3 1 #30 1 ‐3 3

#50 1 ‐2 1 #50 1 ‐3 2

#100 1 ‐2 1 #100 1 ‐4 1

#200 0.2 ‐1.2 0.5 #200 0.4 ‐1.2 0.9

Asphalt 0.2 ‐0.5 0.2 Asphalt 0.1 ‐0.3 0

Gmm 0.006 ‐0.052 0.006 Gmm 0.005 0.013 0.006

Voids 0.1 ‐0.4 0.4 Voids 0.2 0.6 0.3

VMA 0.3 ‐0.5 1.5 VMA 0.1 0.2 0.2

9.5mm      2014

9.5mm   ‐ 16 mixes verified

9.5mm      2015

9.5mm  ‐ 7 mixes verified

Average Variation Between Producer and 

Mobile Lab

Variation Spread

Average Variation Between Producer and 

Mobile Lab

Variation Spread

Min Variation

Max Variation

Min Variation

Max Variation

1/2 0 0 0 1/2 0 0 0

3/8 1 ‐4 2 3/8 1 0 2

#4 2 ‐5 3 #4 1 ‐3 0

#8 1 ‐2 6 #8 1 ‐2 0

#16 1 ‐4 4 #16 1 ‐1 0

#30 1 ‐3 2 #30 1 ‐2 0

#50 1 ‐3 2 #50 1 ‐2 0

#100 1 ‐4 1 #100 1 ‐1 1

#200 0.5 ‐1.0 1.1 #200 0.3 ‐0.9 0.6

Asphalt 0.2 ‐0.5 0.1 Asphalt 0.2 ‐0.4 0

Gmm 0.005 ‐0.040 0.002 Gmm 0.004 ‐0.010 0.003

Voids 0.2 ‐0.4 0.4 Voids 0.2 ‐0.5 0.1

VMA 0.2 ‐0.3 1.3 VMA 0.1 ‐0.1 0.2

East (Mp 300.1 – 359 & A20 – A131)◦ Steve Havrilla – shavrill@paturnpike.com

Central (Mp 142.1 – Mp 300)◦ Brian Wible – bwible@paturnpike.com

West (Mp 0 - Mp142)◦ Chris Forry – cforry@paturnpike.com

Brian Paroda (Materials Lab)◦ bparoda@paturnpike.com

TERRY D. DREHERtdreher@paturnpike.com

724.755.5171 (office)724.875.4911 (cell)