Presentation on theme: "2011 Update on Ride Quality Specifications Frank Palise Advanced Infrastructure Design, Inc. 1 Crossroads Drive, Hamilton, NJ 08691 Phone: 609.838.2216."— Presentation transcript:
2011 Update on Ride Quality Specifications Frank Palise Advanced Infrastructure Design, Inc. 1 Crossroads Drive, Hamilton, NJ Phone:
NJDOT IRI Based Ride Quality Specification NJTA Profilograph Specification FAA Profilograph Specification Update on Selected Ride Quality Specifications
NJDOT IRI Based Ride Quality Specification Profiler Lasers Video Camera Walking ProfilerFull Size Profiler SurPRO SurPro uses a rolling inclinometer to measure longitudinal and transverse profiles
Used for many years Measures PDL (>1/8 inch in 10 feet) Simple, inexpensive Several drawbacks 1. Slow, labor intensive 2. Safety issues 3. Reliability issues 4. Sensitivity issues ROLLING STRAIGHTEDGE (RSE)
Third Specification PROPOSED REVISIONS TO NJDOT’S PAVEMENT AND BRIDGE RIDE QUALITY SPECIFICATIONS Submitted by AID in August 2010 (Currently under review by the NJDOT)
Proposed Specification In the case of an overlay on bare PCC pavement, AID recommends establishing a maximum thickness of 4" for an overlay that would require using a composite pavement factor. Also, if an existing overlay is to be resurfaced with or without milling, the composite pavement factor should not be applied if the final HMA layer is >4".
Proposed Specification For pavements designated to receive a thin lift overlay of less than <1½" A percent (%) improvement specification should be considered. The following is recommended:
Proposed Specification Acceptance. The Department will determine acceptance and make payment adjustments based on the following: Pay Adjustment. The pay equations in Table (A) and Table (B) express the pay adjustment in dollars per lot of 0.01 mile and mile for pavements and bridges, respectively.Table Table
The number of lots for final pay adjustment has been reduced by (number to be inserted by designer). This includes: Exempted bridge and approach/transition slabs 50′ before and after the approach and transition slabs, if not being overlaid with the pavement resurfacing operation or is being overlaid in a separate operation Proposed Specification
Locations where the traffic striping includes turn lanes that cause the through traffic lane to cross over a longitudinally paved joint will be treated in the following manner: yRideability testing will follow the paving pass and will occur prior to application of permanent traffic striping.
Proposed Specification Impediments located in the lane and in shoulders within 5′ of the lane are excluded from pay adjustment, unless the impediments are reset as an item in the contract. The exclusion area will include pavement within 10′ longitudinally before and after the impediment.
Impediments include: utility covers, manholes, catch basins, inlets, transverse joints, intersections, railroad crossings And any other features in the pavement deemed to be a potential impediment to achieving a smooth ride quality. Proposed Specification
Projects of lengths less than one mile will be excluded Pavement segments in projects that are long enough to contain ride quality requirements with less than 2500′ of continuous through travel lane construction will be excluded from the ride quality provisions.
Proposed Specification Do not test Ramps less than 1,000′ AID recommended not testing ramps unless otherwise specified by the NJDOT on a project specific basis, if it is deemed that the length is sufficiently long to justify the inclusion of a ride quality requirement.
Proposed Specification If the preconstruction IRI is already in bonus territory Then the target IRI will be adjusted such that the project’s IRI target range upper limit starts at the preconstruction IRI value.
Proposed Specification Bridge - Test the longitudinal profile of the bridge deck surface for ride quality with a Class 1 Inertial Profiling System According to AASHTO MP 11 and AASHTO PP 49. If jobsite conditions preclude the use of the Class 1 Inertial Profiling System, the Department will use a walking profiler or lightweight profiler.
The Department will use the measured IRI to compute the appropriate pay reduction as indicated in Table below Pay reduction lots consist of mile lengths for each Wheelpath in each lane. Proposed Specification Bridge -
Table Reduction Per Lot of Bare Concrete Deck Slab Due to Nonconformance with Ride Requirements for Mile IRI on Bare Concrete (in/mi.) Reduction Per Lot, Percent ≤ 160 none > 160 ≤ 190 > 190 ≤ 260 > Proposed Specification Bridge -
The Department will determine conformance to the ride quality for concrete deck slabs in 0.005mile lots Each lot being equal to the number of cubic yards of deck concrete placed per miles in the designated traffic lanes The RE will calculate such lot quantity using the specified nominal deck thickness Proposed Specification Bridge -
The Department will test the full extent of each wheel path of each lane in the longitudinal direction of travel The average IRI value of both wheel paths reported for each mile lot of the deck is the average of 3 runs. Proposed Specification Bridge -
The proposed model is of the following form: IRI SPECIFIED = (IRI BASELINE ) (A 1 ) (A 2 ) (A 3 ) … (A k ) Where, IRI BASELINE = standard level of IRI desirable for limited- access highway with pay-adjustment = $0.0 IRI SPECIFIED = adjusted level of IRI to be specified by the Designer based on project-specific conditions A i = factors (variables) that are project specific (see below for further explanation) k = Number of different factors in the equation Proposed Specification
FactorSymbol Speed Limit (MPH)ASAS No. of OperationsAoAo Existing Roughness (IRI)AEAE Composite PavementACAC Generalized (A i ) Factors
Proposed Specification Table 6. A S Factors Note – Projects with less than 35 MPH speed limits, IRI Pay Adjustments will not apply.
Number of Operations (A O ) Number of operations is defined as the number of improvement events allowed For example, milling 2" followed by an overlay of 2" is considered to be 2 operations. Or, milling 2" followed by placing 2" of base and 2" of overlay is considered to be 3 operations. Proposed Specification
Existing Roughness (in terms of IRI) (A E ) This factor recognizes the difficulties in achieving a smooth pavement when the existing pavement is rough. It is observed that the “number of operations” (A O ) and the “existing roughness” (A E ) are inter- connected factors and consideration of both factors contribute to a fair and equitable pay adjustment. Proposed Specification
Table 7. (A O. A E ) Factor Note: Increase the above factor by 1.0 for bridge structures that will be overlaid in one continuous fashion.
Composite Pavement (A C ) If the overlay on bare PCC pavement is > 4", exclude using a composite pavement factor If an existing overlay is to be resurfaced with or without milling, the composite pavement factor should not be applied if the final HMA layer is >4" Table 8. A C Factors Proposed Specification