Louisiana Standard Specifications for Roads and Bridges

LAPA Annual Meeting
May 31, 2012
Point Clear, Alabama
Chris Abadie, P.E.
chris.abadie@la.gov
Materials Engineer
LADOTD

Louisiana Standard Specifications for
Roads and Bridges - 2012
• 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

Problem w/ Asphalt?
4

Solution?
Write a New Spec!
5

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
• Preserves pavement structure, 12 year life
excellent
fair

Section 501
OGFC
• Cost: $7 -$10/sq yd @ ¾” thick.
• Safety:Rut Resistant, improves surface texture,
reduces overspray,
OGFC
• Preservation: Smooths pavement, extends life of
pavement 10-12 years.

504 Tack Coat
• Require annual ASTM calibration for tack
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.)

Shear Strength, psi
Importance of Tack Coat
Interface Shear Strength
100
90
80
70
60
50
40
30
20
10
0
0.03 gal / sq yd
0.15 gal / sq yd
monolithic HMA

Rutting Depth (in)
Importance of Tack Coat
0.80
0.70
0.60
4 yrs
0.50
0.40
8 yrs
14 yrs
0.30
0.20
0.10
Full bond, monolithic lift
very low Bond, stadard rate of tack
60% bond (0.15 gal/sq yd)
0.00
0 24 48 72 96 120 144 168 192 216 240 264
Pavement Age (month)
Based on MEPDG predictions given standard inputs over low modulus subgrade and high level of traffic.

0.08 gal/sq. yd. SS-1
Uniformly distributed???
0.04 gal/sq. yd.
0.08 gal/sq. yd.
0.04 gal/sq. yd.
0.08 gal/sq. yd.
LTRC

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

Spray Paver Equipment
Application of
emulsion
Application of
HMA

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
• Remove full time DOTD inspector duties at plant
• 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 Specs require all new mix design.
• 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.

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:
1
Method.Two,
Tested by:
Minor.Mix
Roadway cores:
District Lab Contractor Independent Lab
Contractor District Lab Independent Lab
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.

7500 ft
Sampling and Testing
0+00
-Acceptance Cores
-Verification Cores
25+00
-Dispute Resolution Cores
50+00
75+00

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.

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)

IRI Table
Percent
Pay
Category A
Interstate
4
Treatments
Cat-B 3
Treatments
Cat-C 2
Treatments
102% 100% 95% 80% 50%
Remove

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

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)

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

Rut Depth (mm)
70 CO 1
70 W 15E
70 W 30E
70 CO 2
70 W 15F
70 W 30F
70 W 15R
70 CO 3
70 W 15L
70 CO 4
70 W 20L
LWT Test Results – 50°C
20
18
16
14
12
10
8
6
4
2
0
LA3121 US 171 LA116
Mix Type

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 “Edge Density Verification”
• 2’ on each side of paving matt excluded from
density measure
• Gauge reading at each edge of every station
where and acceptance core is taken must
meet 90% density.

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

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

503 Equipment
• MTV required
• Lightweight MTV’s allowed
– require temperature measuring device on paver
• Tack coat equipment improvements

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.

Sensor
DMI

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!!