QA Procedures, Rideability Testing, Construction Practice · 2012. 5. 3. · Ultra-Thin Friction...
Transcript of QA Procedures, Rideability Testing, Construction Practice · 2012. 5. 3. · Ultra-Thin Friction...
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PAVEMENT CONSTRUCTION
QA PROCEDURES
RIDEABILITY TESTING
CONSTRUCTION PRACTICE
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Quality Assurance is not
Quality Control
Quality control is Contractors responsibility during
construction.construction.
Quality Assurance is ensuring the project is built according
to the acceptance criteria established for the contract.
This can be at the supplier’s plant, foundry, pre-cast plant,
on the project, etc.
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QA Procedures
• QA starts with the designers
• Constant reviews during project development
– Plan reviews, spec reviews
• Carries over to design assistance during • Carries over to design assistance during
construction
• Value Engineering proposals etc.
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• DIVISION 900 MATERIALS
– 901 Aggregates: HMA, PCC
– 902 Asphalt: Bituminous Materials, HMA,
OGFC / MOGFC, Ultra-Thin Friction Course,
SMA, etcSMA, etc
– 903 Concrete: Concrete, Pavement Repair Mixes,
HPC, Self-Consolidating materials, Grout, etc
– 904 Precast and Prestressed Concrete
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Mix design, verification,
composition, control tables, etc in
each section for plant acceptance.
Volumetrics, unit weight, strength,
yield, permeability, elasticity & yield, permeability, elasticity &
recovery from supplier samples.
These tests are performed before
and during production.
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In the field there are physical
requirements for “in place” product:
thickness, rideability, strength,
compaction. compaction.
These are found in the Construction
Sections of the Standard
Specifications.
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Quality Acceptance includes Pay Adjustments (PA)
which can have an effect on the budget.
Air Voids PA can add up to 4% to the bid price for
Surface Course, other Courses up to 1 % additional.
Ride quality PA can add up to $100 per lane-mile on an
Interstate class highway, $50 per lane-mile on other Interstate class highway, $50 per lane-mile on other
roads.
Conversely, in extreme cases a Remove and Replace
situation can exist for extremely poor quality
workmanship.
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Division 400 - PavementsHMA
HMA Friction Course
Ultra-Thin Friction Course
SMA
Concrete Surface Course
These Sections include materials descriptions,
surface preparation, construction
requirements, etc.
Here is where you find Air Voids
requirements, thickness, rideability; the
criteria that are tested after construction.
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Division 450 - Concrete Pavement
Rehabilitation
Concrete Slab Stabilization, Partial Depth Concrete Slab Stabilization, Partial Depth
Concrete Pavement Repair, Full Depth
Concrete Pavement Repair, Dowel Bars,
Diamond Grinding, Sealing Existing Joints.
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RIDEABILITY TESTING
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“ A dedicated Novell mailbox has been established solely for the
purpose of receiving IRI Pavement Rideability testing requests
from Resident Engineers.
The email address for surface pavement rideability (IRI) testing
is: [email protected].
Please note this mailbox is only for those projects with an IRI
component in their specifications, it is NOT for requesting Rolling
Straight Edge testing, which remains under Materials Straight Edge testing, which remains under Materials
jurisdiction.
Due to restricted resources and the amount of time needed to
conduct multiple testing runs, testing will only be conducted on
lanes with the full length of the lane paved. Requests for partial
lane testing cannot be acted upon. Please request testing AFTER
completion of paving the final riding surface.
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The following information will be required in the body of the e-
mailed request:
Official project name (also in subject of email request); job code
number; Route, direction, Lane(s), MP start & end, number of
paving lifts; a copy of the IRI specification for project; Prime
contractor; Paving contractor; Date(s) surface pavement was
constructed; Surface course mix designation and thickness;
Resident Engineer name, e-mail, cell number, office number, etc,
and best method/hours for contact.and best method/hours for contact.
Once this information is received the project will be scheduled for
Rideability testing. Test scheduling is weather dependent, but
generally within a few days. You will be notified of the proposed
testing date to share with the contractor so they may arrange any
necessary traffic control, sweeping of the project and retroreflective
tape layout as needed prior to testing. Be sure to notify the
contractor of the proposed test date. “
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When the project has been paved , the RE will request
Ride quality testing through a dedicated IRI mailbox.
Pavement management will contact the RE to schedule
this and have retro reflective tape placed to trigger the
machine.
Three passes are taken on each paved lane (to be
averaged in the office during processing), recording the
IRI data, DMI data, digital images (260 per mile), etc.
Data is returned to the Pavement office where it is
processed, i.e. changed to a format readable in Excel
and PA is calculated.
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Specifications are reviewed for any exceptions to PA
application and for the formula to be applied.
The digital images are checked for limits of paving,
locations of any exceptions (bridge decks or … )
The processed data is transferred to the PA program
and the results of the video review are applied. The
program calculates the PA, which is sent to the RE for
his review and transmittal to the contractor.
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PAY ADJUSTMENTS
Most pay adjustments are large, positive or negative
The good contractors do well, pay attention to good
paving practices and earn bonuses (50 to 95% of
tested lots in bonus territory)
Other contractors don’t fare as well and suffer
penalties
Very few projects come in at “zero” pay adjustment
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CONTRACTOR TESTED PA
A 7/3/2008 -$32,301
A 9/11/2008 -$43,349
A 7/31/2008 -$150,469
A 7/31/2008 -$20,018
B 8/5/2008 -$158,358
C 7/11/2008 $50,147
C 8/13/2008 $47,390
C 10/31/2008 $84,833
D 10/10/2008 $249,903
E 9/12/2008 -$85,718
E 10/1/2008 $18,895
E 7/25/2008 $35,989
E 5/21/2008 $42,155
E 9/29/2008 $111,436E 9/29/2008 $111,436
F 12/15/2008 $2,635
G 11/3/2008 $119,095
G 11/3/2008 -$644
H 7/30/2008 $33,270
H 7/30/2008 $18,647
I 9/19/2008 -$28,839
I 7/9/2008 $98,046
J 7/10/2008 -$123,022
K 6/29/2008 -$207,258
K 7/26/2008 -$86,073
K 8/6/2008 -$26,999
K 6/19/2008 -$163,186
L 10/15/2008 $268,769
TOTAL: $51,976
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ASIDE FROM THE MONEY…
Good contractors are delivering projects well
under 50 inches per mile IRI
Many are around 40 inches per mile, some are
delivering below 30 on Interstates delivering below 30 on Interstates
Contractors have learned the bonus is
attainable and are producing good work
Some contractors are still are not making the
effort to achieve the bonus
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OTHER STATESwww.smoothpavements.com
• Bonus payments are generally capped at $600 per 0.1 mile by most states; New Jersey pays $1000 as maximum.
• Most states use 30 or 35 as the top of the • Most states use 30 or 35 as the top of the range for maximum bonus payment; New Jersey pays maximum at 45.
• Many states require corrective action at IRI = 70; New Jersey has remove and replace at >125.
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ANY QUESTIONS?
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CONSTRUCTION PRACTICE
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Good construction practices can make or
break a project.
In a nut shell, it is clean, smooth and
steady.
Even speeds without starting and
stopping promote a smooth finish and
even compaction. Both are key to
bonus for the contractor and a good
road for us.
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Pre Overlay/Inlay – Patching, milling, tack
coat, joint sealing
Laydown – MTV, paverLaydown – MTV, paver
Compaction - Rolling
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Proper Patching Technique
Mark area of pavement to be removed – square or rectangle area
Saw cut and remove bound material
Re-compact base material
Apply tack to vertical faces
Place new AC material in appropriate lift thickness
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Straight-Edge
Roller Patterns and
Joint CompactionJoint Compaction
Density
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Make sure there is material at cold joint for
compaction
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Except for the weight of the paver
screed, the remaining density is achieved
through rollers
Make sure the roller pattern is followed
Make sure the edges and centerline
joints are rolled joints are rolled
Mat temperature should determine
proximity of roller to paver
Rolling too fast can tear mat and create
bumps and dips
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Good tarp coverage
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