2013 Louisiana Transportation Conference

“Louisiana Asphalt Specifications”

Chris Abadie, P.E. chris.abadie@la.gov Materials Engineer

LADOTD

2

Problem w/ Asphalt?

3

Solution?

Write a New Spec!

2013 Louisiana Standard Specifications for Roads and

Bridges • 501 – Thin Lifts

• 504 – Tack Coat

• 502 -Asphalt Mixtures

• 503 - Asphaltic Concrete Equipment and Processes

• 505/6 – Prime coat and curing membrane

• 507 – Surface Treatment

• 509/10 - Cold Planing, Patching and Widening

501 – Thin Overlay “Dense Mix”

• $3 - $7.00 / sq yd (3/4” thick)

• Asphalt spec - PG 64 -22 ( no polymer required)

• Minimum AC content (4.5%)

• Tack coat required (0.08 gallon / sq yd)

• Maximum thickness for all thin lifts – 1.5”

501 Thin Lift “Coarse Mix”

• $5-$8 per sq yd @ ¾” thick.

• 20% smoothness improvement

• Rut Resistant and good surface texture (safe)

• Preserves pavement structure, 12 year life

fair

excellent

OGFC

Section 501

OGFC

Cost: $7 -$10/sq yd @ ¾” thick.

Safety: Rut Resistant,

improves surface

texture, reduces

overspray,

Preservation: Smooths pavement, extends

life of pavement 10-12 years.

504 Tack Coat

• Require annual ASTM calibration for distributor.

• Added “trackless tack” emulsion

• Pay separately for tack coat, by the gallon. ($2.50 -$3.00 per gallon)

• Increase the Design Rate of Tack rate. Ex. .03 min. to 0.06 gallon per square yard min. on new surfaces; (raised minimum tack rate on any surface to 0.04 gallon per sq yd.)

LTRC

0.08 gal/sq. yd. SS-1

Uniformly distributed???

0.08 gal/sq. yd.

0.04 gal/sq. yd.

0.08 gal/sq. yd.

0.04 gal/sq. yd.

Importance of Tack Coat Interface Shear Strength

0

10

20

30

40

50

60

70

80

90

100

Sh

ea

r S

tre

ng

th,

ps

i

0.03 gal / sq yd0.15 gal / sq ydmonolithic HMA

0.00

0.10

0.20

0.30

0.40

0.50

0.60

0.70

0.80

0 24 48 72 96 120 144 168 192 216 240 264

Pavement Age (month)

Rut

ting

Dep

th (i

n)

Full bond, monolithic lift

very low Bond, stadard rate of tack

60% bond (0.15 gal/sq yd)

Based on MEPDG predictions given standard inputs over low modulus subgrade and high level of traffic.

Importance of Tack Coat

4 yrs

8 yrs

14 yrs

Old Tack Truck

Roadtec

SP-200

Spray Paver

Spray Paver Features • Addresses the constructability vs

performance issue

– No tracking of tack

– Uniform application of tack

– Enables higher tack rates with better materials

Vogele

502

• All Hot Mix product purchase by La. DOTD will be produced by a DOTD Certified Hot Mix Plant

• All Hot Mix will be test by a LaDOTD Certified Laboratory or an AASHTO Material Reference Laboratory AMRL

502 Asphalt Mixtures

• Added SMA (Old 508) , and Asphalt Treated Base

• Added binder substitutions; Allow PG82-22rm, latex modified, hydrated lime mixture, PG 70 for PG 76 if LWT is passing

• Require Contractor QC data entry into data system

• Pay on Roadway Density of ton received on proj.

• Measure smoothness of “project” instead of lot

• Changed Localized Roughness

502

Plant Inspector is being removed form the Hot Mix Plant on a daily basis.

• LADOTD is instituting the roving Super Inspector concept. This inspector can inspect HMA on the roadway, at the plant, and at testing laboratories.

• The regular roadway inspector will inspect the roadway project as always.

New Mix Design is Required

• No existing mix design will be accepted.

• Gyratory gyration have been changed.

• Loaded Wheel Tester (LWT) or Hamburg is required.

• Lab Tech to design new mix and all submittal will be done through Site Manager.

• District Lab Engineer will approve mix for the validation process.

502 Table 502-7 Asphalt Mix Design Changes

• LWT required for all mixtures – verified by DL

• Raised design VFA to 73! (no longer a target)

– Raised VMA.

• Lowered Gyrations to 65 and 75 (low and high traffic)

• Allow for 5% increase in RAP if “fractionated” -split on the 1”. (still must meet LWT)

JMF Validation

• Validation Lot is 2000 tons. • Super Inspector and Lab Tech will work together to

produce the best mix in the middle of the spec. • All mix information will be reported into Site

Manager in real time • 5 roadway core will be evaluated by PWL for mix

design CONDITIONAL validation approval. • Lotman and LWT must pass for FINAL Validation

Approval

JMF in Plant Production

• There are NO PAY PARAMETER for the plant. It is assumed that the mix produced is 100%

• No daily Inspector present, he is roving.

• Lab Tech is running daily test and reporting all result real time into Site Manager via the internet.

• JMF (#1) is reported as a P-Lot. P-Lots are not job specific and have NO PAY parameters. P-lots are revalidated every two years but never die.

Roadway Lot (RL) Size

• Mainline RL = 37,500 linear feet divided in to 5 sublots = 7,500 linear feet.

• Mainline RL < 37,500 linear feet will be subdivided in to sublots, defined in the Quality Assurance Manual.

• Minor Mix (shoulder etc) = 1000 tons lots.

District Lab Method 1.

• Roadway Inspector will deliver 15 pay cores to District Lab.

• District Lab will evaluate 15 pay cores and determine the PWL pay. NO Time Line.

• Contractor will evaluate the verification cores and report results into Site Manager

Table 502.11.1.1 Sampling Acceptance Verification Resolution

# of Mainline Roadway cores: Per 7500 ft. rdwy

3

1 per 2500ft

1 1

Method One, Tested by:

District Lab Contractor Independent Lab

1Method.Two, Tested by:

Contractor District Lab Independent Lab

Minor.Mix Roadway cores:

1 per 1000 tons delivered to roadway sampled by roadway inspector and tested by District Lab for acceptance

1 When Approved by the district lab

engineer.

Sampling and Testing 7500 f

t

0+00

25+00

50+00

75+00

-Acceptance Cores

-Verification Cores

-Dispute Resolution Cores

Contractor Lab Method 2

• Materials Engineer and District Lab Engineer approve Contractor’s Certified AMRL Lab to evaluate QA Pay Cores.

• District Lab evaluates Verification Cores.

• Contractor evaluates 15 pay cores and determine the PWL pay, results reported into Site Manager real time.

Acceptance Using Contractor Data

• Method 2; When IA lab is established and operating and when contractor’s certified lab has established consistency for the JMF/plant per Materials Engineer, the DL may approve the use of contractors test results in the roadway acceptance decision.

• Contractor to test 15 cores/lot for acceptance and report Pay (based on PWL table)

• DOTD DL to test 5 cores / lot for verification

• Lot verifies if average is within 1.5%

• DOTD to hold 5 cores for resolution to use for lots found out of tolernace.

• Independent lab test on resolution cores will rule.

Verification Cores

• 5 Verification Cores per lot, 1 per 7,500 feet

• Location determined by random numbers.

• All 6 inch cores with trimmed bottoms

• Cores evaluation will be an Average. The average must = 92% Density for Roadway.

Resolution Cores

• Acceptance Cores and Verification Cores are going to be evaluated by a F and T Test in the Site Manager Program.

• Failing F and T Test will trigger the Resolution Cores to be evaluated at another Certified Lab independent of the District Lab or the Contractor Lab.

• Results are the final answer for Pay.

Smoothness

• Measure IRI of entire project upon completion.

– 65 IRI required for Interstate, 45 IRI =2% bonus

• Include localized roughness measure, 25 ft sliding baseline per Proval smoothness measure program available from FHWA.

• Exclusion of areas is allowed (manholes in urban areas, bridge tie-ins etc)

AMES “LISA” Lightweight

Inertial Profiler

Lightweight profilers

measure pavement profile

(IRI), Profile index, (PI),

rutting, and PCC joint

faulting at 10-15 mph.

IRI Table

Percent

Pay

102% 100% 95% 80% 50% Remove

Category A

Interstate

Or 4 Treatments

<45 <65 65-85 86-149 150

Cat-B 3

Treatments <55 <75 76-95 96-149 150

Cat-C 2

Treatments <55 <85 86-110 110-149 150

Cat-D 1

Single Lift NA 20%

Improvment

0-19% Improvment

< Existing

Localized Roughness ProVal

Wearing Course

25 foot Sliding Baseline

Binder Course

PI

Category A

170 350

Category B 190 400

Category C

210 N/A

Category D No New Bumps N/A

Loaded Wheel Tester, LWT

• Required for 501 and 502 • Required for Design • Re-Test every 20,000 tons

• Max rut

• 6mm for High Traffic • 10mm for Low Traffic

LWT Test Results – 50°C

0

2

4

6

8

10

12

14

16

18

20

Ru

t D

ep

th (

mm

)

70 C

O 1

70 W

15E

70 W

30E

70 C

O 2

70 W

15F

70 W

30F

70 W

15R

70 C

O 3

70 W

15L

70 C

O 4

70 W

20L

Mix Type

LA3121 US 171 LA116

502 Asphalt Materials (Con’t) New Terms

• Established “Mainline and Minor” Paving

• Mainline mixtures are for use in travel lane

• Minor mixes are all other mixes.

• Established Mainline “Roadway Lots”

– 37,500 ft of as received mixture on roadway travel lane is a lot.

• Minor mix, pay with mainline or paid per mainline methods if paved >7’ separately.

• Other Minor mix, pay per tons received, 100%; If voids at plant are out of spec; adjusted pay 5%.

502 Asphalt Materials, (Pg 3) Sampling Roadway

• Pay on Roadway cores for Mainline travel lanes

– Sample for pay 1 per 2500 ft.; 3 per sublot (7500ft); 15 per lot.

– Sample for verification , 1 per 7500 ft

– Sample for dispute resolution, 1 per 7500 ft.

• DOTD roadway inspector to indentify all random core locations, contractor to cut core, wrap and seal and inspector to send cores to designated lab for testing

502 Asphalt Materials (PG 4) Acceptance

• Two methods available for testing responsibilities;

– Method 1; DOTD district lab test all cores for pay; Contractor Lab test verification core for information; Dispute resolution held for dispute resolution.

• DOTD to test 15 cores/lot for acceptance, Gmb and compare to JMF verified Gmm.

• DOTD DL to check Gmm from roadway core 1/lot; the tolernace allowed is 0.024.

Statistical Analysis PWL , F and t test

p

0 . 0

0 . 1

0 . 2

0 . 3

i

9 0 9 1 9 2 9 3 9 4 9 5 9 6 9 7 9 8

Minimum

Density

Spec.

92.0%

Roadway Density (%)

1.492, X 94.1

pdf for

90PWL 100% PAY

93.992.02)1.282(1.49

93.9μ

93.592.06)1.282(1.16

93.5μ

Dispute Resolution

• Use dispute resolution core gmm as tested by independent lab if Average gmm of 3 cores is out of tolerance

• Use dispute resolution if any DOTD verification core is below spec and contractor pay is reported to be 100% or more.

• Independent lab or adjacent District lab will serve as resolution lab.

Independent Assurance Team

• Team established to provide system analysis of contractors plant lab and DOTD district labs

• Provide performance review for every technician.

• Provide and analyze co-op samples for all asphalt lab certified technicians

• Available to Assist in dispute resolution

Quality Manual

• Design Requirements, submittal forms, detail of mix design data required by DOTD, etc.

• QC/QA; Requirements of Contractor and minimum requirements of DOTD “Super” inspectors.

• Example 1000 Ton “P Lots” ,

• Outline of Quality level analysis procedures, PWL etc.

• Example roadway lot and pay calculations

Binder Sampling and Testing

• Matlab assigns Approved Supplier No/ Approved Brand Name,

• Lab # issued and placed on Certificate of Delivery with quantity of delivery.

• Contractor collects all certificates and makes available to DOTD representative. En ter into SMM.

Binder Sampling and Testing

• JMF validation testing by DL.

• Minimum one working tank per binder type per plant per month sampled at plant, sent to Matlab.

• Random Verification Sample directed by MATLAB (Transport and Working Tank) 1 / 500K gallons.

• Project testing at DL to approve production on each project on first days production

• Contractor to supply daily test results

• For all binders submit one core per project for GPC testing

“Self Certified Source” Contractor Blending at Plant

503 Equipment

• MTV required

• Lightweight MTV’s allowed

– require temperature measuring device on paver

• Tack coat equipment improvements

Certification

• Roadway Equipment is not certified, it is “ “verified” on the roadway by DOTD inspector check list.

• Plant Certification every other year

• Technician Certification every other year

– Must have successfully demonstrated all performances.

– All Proficiency samples to be distributed to each technician a minimum of once per year

PAVE-IR INSTALLATION

The MOBA Operand™ computer

attaches to sensor beam.

GPS antenna mounts above the

Operand™ computer.

Memory drive connects directly to

Operand™ computer

System is powered by machine

voltage (10-28 VDC).

Sensor beam is hinged in center for

easy setup and storage.

DMI Sensor

WMA

Conclusion Part V

• 505/6 – Prime coat and curing membrane

– No Major Changes , Pay incidental to construction

• 507 – Surface Treatment (gradation of Size 1)

• 509/10 - Cold Planing, Patching and Widening

– No major changes

THANK YOU

THANKS FOR YOUR ATTENTION

From: “The Abadies”