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Implementation Toolbox
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NTPEP Implementation Toolbox


Disclaimer: State Specifications are included on this page as examples of how States have specified the use of these products. NTPEP does not endorse, validate, and/or deny them as appropriate for your agency.

 

Asphalt Release Agents (ARA)

 

Overview

 

  • Evaluation based on AASHTO TP 102, “Evaluation of Asphalt Release Agents."
  • Evaluation of products that are used for coating tools and truck beds to prevent asphalt binder or hot mix asphalt (HMA) from adhering.
  • Asphalt release agents should perform this function without causing degradation (stripping) of the hot mix asphalt.
  • Products evaluated should not be hazardous for workers to use and should have low or no environmental impact.

 

Evaluation

  • Asphalt Stripping Test – evaluates the susceptibility of stripping of asphalt from aggregates in truck beds and on other paving equipment when using asphalt release agents.
  • Mixture Slide Test – evaluates the susceptibility of a hot mix asphalt (HMA) mixture adhering to the beds of haul trucks or paving equipment when using asphalt release agents.
  • Asphalt Performance Test – determines the susceptibility of hot asphalt binders adhering to plant and paving equipment, rakes, shovels, etc. when using asphalt release agents.
  • Fingerprinting  
    • Infrared Spectra, Percent Solids, pH, Specific Gravity, Flash Point
  • Products are re-evaluated every 3 years.

 

Links

 

Additional information on this evaluation can be found at: http://www.ntpep.org/Pages/ARA.aspx

 

AASHTO National Transportation Product Evaluation Program (NTPEP) www.ntpep.org

 

AASHTO NTPEP DataMine https://data.ntpep.org/

 

Success Stories

 

Ohio DOT, Office of Materials Mgmt.

Brad Young

New Products Engineer

Brad.Young2@dot.ohio.gov

 

One NTPEP program that provides ODOT some benefit, that could easily be used by other states, is the Asphalt Release Agent program.  In speaking with the section that handles these products, they mentioned the following:

1.    The testing done by NTPEP is more thorough than what they used to do.

2.    The NTPEP program ensures that the testing is done by a 3rd party.

3.    Only serious companies with serious products submit to NTPEP because they pay for the testing (weeds out the questionable products).

 

Ohio DOT specification for asphalt release agents

 

401.11 Hauling. Use trucks for hauling asphalt concrete that have tight, clean, smooth metal beds from which the entire quantity of mixture is discharged smoothly into the spreading equipment.

Before loading, apply a thin coating of an approved release agent to the inside surfaces of the truck bed to prevent adhesion of mixture to the bed surfaces. Office of Materials Management maintains a list of approved release agents.

 

Link to the Ohio DOT Approved Listing that includes instructions for submitting products for ODOT approval:

http://www.dot.state.oh.us/Divisions/ConstructionMgt/Materials/Asphalt%20Information/Release-Agent-Approved-List.pdf

 

 

 

SCDOT Office of Materials and Research

Temple K. Short, PE

Materials & Research Operations Engineer

shorttk@scdot.org 

 

South Carolina DOT use of the NTPEP ARA program for asphalt release agents

 

“Previously flash point and stripping were tested in house.  Using NTPEP laboratory results saves us time and resources and gives us a much more extensive set of data."

 

Example State Specifications

 

 

Concrete Admixtures (CADD)

 

Overview

  • This evaluation consists of laboratory testing.
  • Testing is based on AASHTO M 194, “Standard Specification for Chemical Admixtures for Concrete."
  • The evaluation protocol for liquid chemical admixtures shall be as per AASHTO M 194.
  • The evaluation protocol for air entraining agents is AASHTO T 157, “Standard Method of Test for Air-Entraining Admixtures for Concrete."
  • CADD evaluations consist of:
    • Level 1 – Provides testing needed to verify compliance with AASHTO M 194.
    • Level 2 – Uniformity and equivalence testing that can be used to verify that a product formulation has not changed since the Level 1 testing was performed. Level 2 testing is performed within 5 years of the Level 1 evaluation or if the product name has changed.
  • Products are tested every 5 years.
  • Dry Cast Admixtures and Corrosion inhibitors will be accepted by the technical committee for Level 2 testing only.
  • Specialty Admixtures (Type S) will be tested using the standard evaluation protocol without evaluating special properties.

 

Links

Additional information on this evaluation can be found at: http://www.ntpep.org/Pages/CADD.aspx

 

AASHTO National Transportation Product Evaluation Program (NTPEP) www.ntpep.org

 

AASHTO NTPEP DataMine https://data.ntpep.org/

 

 

Success Stories

Kentucky Transportation Cabinet

Wesley Glass re: CADD

Division of Materials

wesley.glass@ky.gov 

 

“They (Kentucky Transportation Cabinet) accept CADD by cert and NTPEP alone. They do an IR scan for comparison and do perform their own chloride test.  They do no physical (performance) testing. “

 

Example State Specifications

 

Concrete Curing Compounds (CCC)

 

Overview

  • The evaluation consists of laboratory testing.
  • Testing is based on ASTM C309, “Standard Specification for Liquid Membrane-Forming Compounds for Curing Concrete."
  • Testing includes:
    • AASHTO T 155, “Standard Method of Test for Water Retention by Liquid
      • Membrane-Forming Curing Compounds for Concrete."
    • Minnesota DOT “Three-Day Settlement Test."
    • ASTM D93, “Standard Test Method for Flash Point by Pensky-Martens Closed Cup
      • Tester."
    • Fourier Transform Infrared Spectroscopy (FTIR) Scan
  • Products are submitted for retesting every 3 years.

 

 

Links

Additional information on this evaluation can be found at: http://www.ntpep.org/Pages/CADD.aspx

 

AASHTO National Transportation Product Evaluation Program (NTPEP) www.ntpep.org

 

AASHTO NTPEP DataMine https://data.ntpep.org/

 

 

Success Stories

Kentucky Transportation Cabinet

Wesley Glass re: CCC

Division of Materials

wesley.glass@ky.gov 

 

“Prior to NTPEP they (Kentucky Transportation Cabinet) did limited testing on CCC.  Addition of products to the List of Approved Materials is now based solely on certification and NTPEP testing, the additional testing provided by NTPEP provides greater confidence."

 

 

West Virginia DOT

Andrew Thaxton

Andrew.M.Thaxton@wv.gov

 

Re: West Virginia DOT use of NTPEP for qualification of Concrete Curing Compounds (CCC)

I think NTPEP has allowed us to free up some agency resources. With tight budgets and little time NETPEP has proven to be a valuable asset with product evaluation. It is a trusted source of information for products we use such as curing compounds.

 

Example State Specifications

 

 

 

HMA Crack Sealers (CS)

 

Overview

PCC Joint Sealant product types evaluated

    • Hot-poured products are those that meet the requirements of ASTM D6690, “Standard Specification for Joint and Crack Sealants, Hot Applied for Concrete and Asphalt Pavements."
    • Cold-applied products are those that meet the requirements of ASTM D5893, “Standard Specification for Cold Applied, Single Component, Chemically Curing Silicone Joint Sealant for Portland Cement Concrete Pavements."
      • Types SL (Self-leveling) and NS (Non-sag) are evaluated.
    • Preformed elastomeric products are those that meet the requirements of ASTM D2628, “Standard Specification for Preformed Polychloroprene Elastomeric Joint Seals for Concrete Pavements."

HMA Crack Sealer product types evaluated

  • HMA crack sealer types evaluated include products meeting one of the following specifications:
    • ASTM D6690, “Standard Specification for Joint and Crack Sealants."
    • ASTM D5078, “Standard Specification for Crack Filler, Hot-Applied, for Asphalt
      • Concrete and Portland cement Concrete Pavements."



Evaluation

  • The evaluation includes lab testing and a field trial for both JS and CS products.
  • After the initial evaluation, products are retested (lab only) every 3 years.
  • If the product formulation has changed, then retesting will include both lab testing and a field trial.
  • Lab samples must be from the same lot or batch as material used in the field trial.

 

Hot-poured Sealer Lab Testing

  • Samples are evaluated in accordance with ASTM D6690.
  • Lab testing includes:

 

- Bond to Concrete- Asphalt Compatibility
- Resilience- Apparent Viscosity
- Cone Penetration- Softening Point

 

Cold-applied Sealant Lab Testing

  • Samples are evaluated in accordance with ASTM D5893.
  • Lab testing includes:

 

- Tack Free Time- Effects of Heat Aging
- Bond to Concrete- Flow
- Effects of Accelerated Weathering- Slump Test (NS products)
- Resilience- Hardness
- Ultimate Elongation and Tensile Strength at 150% Elongation

 

 

Preformed Elastomeric Seal Lab Testing

  • Samples are evaluated in accordance with ASTM D2628.
  • Lab testing includes:

 

- Tensile Strength and Elongation- Type A Hardness
- Oven Aging- Oil Swell
- Low Temperature Stiffening- Low Temperature Recovery
- High Temperature Recovery- Compression- Depression

 

 

Field Trial

  • The intent is to alternate test deck locations so as to represent all climatic regions.
  • A pavement condition survey is performed prior to the field trial.
  • Roadway information such as pavement slope, joint spacing, joint width and the condition of joints is documented.
  • The test deck consists of at least 10 joints per sealant material.
  • Test deck information gathered includes:
    • Annual average daily traffic
    • Monthly weather conditions
    • Deicing salt used per lane mile through the test deck

 

Links

 

Additional information on this evaluation can be found at: http://www.ntpep.org/Pages/JSCS.aspx

 

AASHTO National Transportation Product Evaluation Program (NTPEP), www.ntpep.org

 

AASHTO NTPEP DataMine, https://data.ntpep.org/

 

Success Stories

Maryland SHA

 

Gloria Burke 

QA Field Engineer  

gburke@sha.state.md.us

 

Maryland uses the NTPEP evaluations when approving crack filler and joint seal products. We require vendors to enroll in the program, have their material tested and provide us with the evaluation results. This info from NTPEP is then checked against our specifications and we usually require a field demonstration to ensure the product will work with our climatic temperature ranges and/or asphalt mixtures. Since Maryland does not have to use our in-house resources for testing, we realize a cost-savings by way of a very thorough NTPTP evaluation process. To date, we have not experienced any issues with the products evaluated or from the field demos.

 

Example State Specifications

 

Epoxy Resin Based Adhesive Systems (ERB)

 

Overview

  •  
  • This evaluation program is based on testing described in ASTM C881, “Standard Test Method for Epoxy-Resin Base Bonding Systems for Concrete."
  • Products evaluated by this program are two-component, epoxy-resin bonding systems for application to Portland-cement concrete as described in ASTM C881.  Typical applications for these products are:
    • Bonding hardened concrete to hardened concrete and other materials
    • Bonding freshly mixed concrete to hardened concrete
    • Epoxy used as a binder in epoxy mortars and concrete.
    • Bonding and sealing segmental precast elements.
    • Bonding Skid-Resistant materials to hardened concrete
    • Grouting dowel rods
  • The NTPEP test are currently index tests and do not reflect site and/or field conditions to which these materials are typically subjected.
  • This evaluation program does not address the effects of creep on epoxy resin based bonding systems while under load or the potential for creep rupture. Additional testing is required for applications where creep and creep rupture are critical.
  • This program also includes Infrared Spectra for Qualitative Analysis based on ASTM E573, “Standard Practices for Internal Reflection Spectroscopy."
  • Following the initial testing and reporting of a product, it must be re-tested every three years.

 

Links

Additional information on this evaluation can be found at:

http://www.ntpep.org/Pages/ERBDocuments.aspx

AASHTO National Transportation Product Evaluation Program (NTPEP)

www.ntpep.org

AASHTO NTPEP DataMine

https://data.ntpep.org/


Geotextiles (GTX)

Overview

 

  • This is a testing and audit program
  • Testing is based on AASHTO M 288 “Standard Specification for Geotextile Specification for Highway Applications."
  • Individual products are retested every 3 years.
  • Audits are conducted annually.
  • The audit program requires that manufacturers provide product marking directly on the fabric and labeling on the rolls.
  • The audit program verifies that manufacturing plants, private label companies, and converters conform to the quality assurance requirements of the GTX work plan.

 

GTX Testing

  • ASTM D5261, “Standard Test Method for Measuring Mass per Unit Area of Geotextiles."
  • ASTM D4632, “Standard Test Method for Grab Breaking Load and elongation of Geotextiles."
  • ASTM D4533, “Standard Test Method for Trapezoid Tearing Strength of Geotextiles."
  • ASTM D4491, “Standard Test Methods for Water Permeability of Geotextiles by Permittivity."
  • ASTM D6241, “Standard Test Method to Determine Asphalt Retention of Paving Fabrics Used in Asphalt Paving for Full-Width Applications"
  • ASTM D4751, “Standard Test Method for Determining Apparent Opening Size of Geotextile"
  • ASTM D4355, “Standard Test Method for Deterioration of Geotextiles by Exposure to Ultraviolet Light and Water (Xenon-Arc Type Apparatus)"
  • Test results for each product are provided in table form for easy comparison to AASHTO M 288 and your state specifications.

 

GTX Audits

  • Audits follow the NTPEP “Standard Practice for Qualification of Highway Product Manufacturers Through the Use of NTPEP Audits."
  • Products must be marked and labeled.
    • Markings must be clearly printed along the edge of the product roll at least once every 5 meters.
    • The marking shall be a NTPEP established identifier that is unique to each manufacturer and facility.
    • Labels must be affixed to both ends of the outer product wrapping and at the roll core. Labels must state roll number, production date, AASHTO M 288 class, and the product name.
  • Private Labelers
    • Products must come from a compliant NTPEP audited manufacturer.
    • Products must be traceable to an audited, NTPEP compliant source manufacturer.
    • The source manufacturer must print the private label information on the rolls and labels.
  • Geotextile Converters
    • Converters modify a geotextile that has been obtained from another manufacturer to produce a finished product that is different from the source product.
    • Converters must re-label rolls and may reprint a new code or name on fabrics. The new code or name must match the new labels.
  • Audit reports and test results can be found in DataMine.

 

Links

 

Additional information on this evaluation can be found at: http://www.ntpep.org/Pages/Geosynthetics.aspx

 

AASHTO National Transportation Product Evaluation Program (NTPEP) www.ntpep.org

 

AASHTO NTPEP DataMine https://data.ntpep.org/

 

Success Stories

 

New Hampshire DOT

Glenn Roberts, PE

Geotechnical Chief

Recently retired

 

In 2003 the New Hampshire Department of Transportation (NHDOT) implemented a new standard specification for geotextiles requiring prequalification of products based solely on NTPEP test data.  Prior to that time, products were listed based on manufacturer-supplied minimum average roll values.   Use of the NTPEP test data has provided the Department with a credible, consistent source of qualified products for use on NHDOT construction projects with minimal demand on limited in-house resources.

 

Example State Specifications

 

 

PCC Joint Sealants (JS)

 

 

Overview

PCC Joint Sealant product types evaluated

    • Hot-poured products are those that meet the requirements of ASTM D6690, “Standard Specification for Joint and Crack Sealants, Hot Applied for Concrete and Asphalt Pavements."
    • Cold-applied products are those that meet the requirements of ASTM D5893, “Standard Specification for Cold Applied, Single Component, Chemically Curing Silicone Joint Sealant for Portland Cement Concrete Pavements."
      • Types SL (Self-leveling) and NS (Non-sag) are evaluated.
    • Preformed elastomeric products are those that meet the requirements of ASTM D2628, “Standard Specification for Preformed Polychloroprene Elastomeric Joint Seals for Concrete Pavements."

 

HMA Crack Sealer product types evaluated

    • HMA crack sealer types evaluated include products meeting one of the following specifications:
      • ASTM D6690, “Standard Specification for Joint and Crack Sealants."
      • ASTM D5078, “Standard Specification for Crack Filler, Hot-Applied, for Asphalt
        • Concrete and Portland cement Concrete Pavements."

           

Evaluation

  • The evaluation includes lab testing and a field trial for both JS and CS products.
  • After the initial evaluation, products are retested (lab only) every 3 years.
  • If the product formulation has changed, then retesting will include both lab testing and a field trial.
  • Lab samples must be from the same lot or batch as material used in the field trial.

 

Hot-poured Sealer Lab Testing

  • Samples are evaluated in accordance with ASTM D6690.
  • Lab testing includes:

 

- Bond to Concrete- Asphalt Compatibility
- Resilience- Apparent Viscosity
- Cone Penetration- Softening Point

 



Cold-applied Sealant Lab Testing

  • Samples are evaluated in accordance with ASTM D5893.
  • Lab testing includes:

 

- Tack Free Time- Effects of Heat Aging
- Bond to Concrete- Flow
- Effects of Accelerated Weathering- Slump Test (NS products)
- Resilience- Hardness
- Ultimate Elongation and Tensile Strength at 150% Elongation

 

 

Preformed Elastomeric Seal Lab Testing

  • Samples are evaluated in accordance with ASTM D2628.
  • Lab testing includes:

 

- Tensile Strength and Elongation- Type A Hardness
- Oven Aging- Oil Swell
- Low Temperature Stiffening- Low Temperature Recovery
- High Temperature Recovery- Compression- Depression

 

 

Field Trial

  • The intent is to alternate test deck locations so as to represent all climatic regions.
  • A pavement condition survey is performed prior to the field trial.
  • Roadway information such as pavement slope, joint spacing, joint width and the condition of joints is documented.
  • The test deck consists of at least 10 joints per sealant material.
  • Test deck information gathered includes:
    • Annual average daily traffic
    • Monthly weather conditions
    • Deicing salt used per lane mile through the test deck

 

Links

 

Additional information on this evaluation can be found at: http://www.ntpep.org/Pages/JSCS.aspx

 

AASHTO National Transportation Product Evaluation Program (NTPEP), www.ntpep.org

 

AASHTO NTPEP DataMine, https://data.ntpep.org/

 

Example State Specifications

 

 

Portable Changeable Message Signs (PCMS) Flashing Arrow Panels (FAP)

Overview

  • PCMS products evaluated shall be solar powered and in compliance with the standards as stated in Section 6F.60 of the 2009 Manual on Uniform Traffic Control Devices (MUTCD).
  • FAP products evaluated shall be solar powered and in compliance with the standards as stated in Section 6F.61 of the 2009 MUTCD.
  • The evaluation consists of “Sight Tests" that evaluate driver ability to see and read the displayed message, and “Performance Tests" that evaluate the sign's ability to remain powered with and without the solar array.

 

Field Evaluation

 

Sight Tests

  • Sight tests will be performed by 3 evaluators traveling toward the sign in a sedan.
  • Daytime and nighttime evaluations will be performed for each sign.
  • Evaluations will be performed on a flat road in clear, cloudless weather. The setting will be free from outside visual distractions such as city lights or billboards.
  • PCMS products will display 2 lines of non-traffic related words and 1 line of letters that do not form words.
  • The evaluators will check for visibility, legibility, and angularity and will record a distance for each test.
    • Visibility - The distance at which the displayed message is visible when approaching the sign in a line perpendicular to the sign face.
    • Legibility - The distance at which the all characters of the displayed message can be read.
    • Angularity - The maximum angle from a line perpendicular to the sign face where characters in the message are still legible.
  • Evaluators will take turns driving during the visibility, legibility, and angularity tests.

 

Performance Test

  • Signs are tested in cold (low 40's) and hot (upper 80's) weather conditions.
  • The starting voltage level of the sign battery-bank shall be recorded at the start of testing (with solar array connected). After 30 days of continuous operation, the voltage level will be measured again.

 

Shutdown Test

  • Signs are operated with the solar array disconnected until the sign shuts down and ceases to display a message. This is intended to indicate the sign's battery backup system capacity.

 

Links

 

Additional information about this evaluation can be found at: http://www.ntpep.org/Pages/PCMS.aspx

 

AASHTO National Transportation Product Evaluation Program (NTPEP) www.ntpep.org

 

AASHTO NTPEP DataMine https://data.ntpep.org/

 

Success Stories

New York State Department of Transportation, Main Office

Sandra M Urrutia

ITS Technical Unit

50 Wolf Road, Albany, NY 12209

sandra.urrutia@dot.ny.gov

 

New York State Department of Transportation maintains an APL (Approved Product List) for Portable Variable Message Signs (PVMS). These are temporary traffic control devices with the flexibility to display a variety of messages. In order for NYSDOT to evaluate a PVMS for the APL, companies complete and submit the NYSDOT PVMS qualification form. (https://www.dot.ny.gov/divisions/operating/oom/transportation-systems/repository/VMSQualificationForm_2017.pdf

 

There are currently three categories for qualification: the submittal of a successful NTPEP testing, the submittal, review, and acceptance of qualified test results from another State Transportation Agency or nationally recognized testing facility, or by testing and evaluation of the PVMS by NYSDOT subject matter expert.

 

By accepting the NTPEP testing, NYSDOT only reviews, tests, and accepts approximately 5% of the PVMS applications submitted. The State of New York benefits in cost from the reduction of time and man hours needed for the evaluation, testing and acceptance.

 

Example State Specifications

 

 

Pavement Marking Materials (PMM)

 

Overview

Product types evaluated by this program include Waterborne Paint, Solvent Borne Paint, Thermoplastics, Permanent Polymeric Tape, Temporary Tape, and Multi-Component Durable markings (Epoxy, Polyester, Polyurea, Methyl Methacrylate). Experimental products may be included in field trials but will not be lab tested.

 

Evaluation

The evaluation consists of lab testing and a field trial.

 

Lab testing

    • Waterborne and solvent-borne paint testing includes density, degree of settling, no-pick- up time, pigment content, titanium dioxide content, solids content, viscosity, and x-ray diffraction spectrum.
    • Testing of thermoplastics includes specific gravity, softening point, low temperature stress resistance, daylight reflectance (color), hardness, titanium dioxide content, and an IR scan of the binder.
    • Testing of pavement marking tapes includes tensile strength, ultimate elongation, retroreflectivity, daylight reflectance, skid resistance, surface IR of adhesive layer, binder content, and titanium dioxide content.
    • Testing of multi-component products includes a surface IR scan of reacted film, IR scan of each component, percent pigment for each component, percent total solids for each component, drying time, epoxide number, hardness, yellowness index, and daylight reflectance.

 

Field Trial

    • The intent is to alternate test deck locations so as to represent all climatic regions.
    • Test decks will be located on both concrete and asphalt surfaces.
    • Test deck pavements will have been open to traffic for at least 2 years prior to product installation.
    • Test decks will be on roadways with a minimum ADT of 5,000.
    • Paints may be evaluated for either 2 or 3 years. Thermoplastics, permanent tapes, and multi-component durable markings are evaluated for 3 years. Temporary tapes are evaluated for 6 months.
    • Temporary tapes are also evaluated for removability.
    • After an initial performance evaluation, field evaluations are conducted on a monthly basis for the first year and on a quarterly basis for the remaining time.
    • Field evaluations include retroreflectivity, durability, daytime color, nighttime color, wet/dry retroreflectivity, and photographic documentation
    • Winter weather data (date, type, amount) is recorded along with the number of snow plow passes, the amount of deicing chemicals, and anti-skid materials.

 

Links

 

Additional information about this evaluation can be found at: http://www.ntpep.org/Pages/PMM.aspx

 

AASHTO National Transportation Product Evaluation Program (NTPEP) www.ntpep.org

 

AASHTO NTPEP DataMine https://data.ntpep.org/

 

 

Succe ss Stories

Alabama DOT

Andre' Jenkins

jenkinsa@state.al.us 

 

Alabama uses NTPEP for thermoplastic pavement markings. Prior to that they did in-house testing and field evaluation.   NTPEP has allowed them to save the time and expense of in-house testing.  They are also realized improved personnel safety by avoiding the need to work in traffic to review product performance.

 

Louisiana DOTD Materials Laboratory

Jason K. Davis, P.E.

Field Quality Assurance Administrator

jason.davis@la.gov 

 

Louisiana use of the NTPEP Pavement Marking Materials evaluations

The PMM program has been a tremendous help in evaluating products submitted to our Approved Materials List.  We don't have the experience or personnel to manage a test deck for evaluations, and having access to up to three years of field data plus laboratory data allows us to quickly assess product performance.  Also, the PMM data is helpful in determining performance comparisons between classes of products, and this type of data can help us update specifications.

 

 

Texas Department of Transportation

Johnnie S. Miller, P.E.

Coatings & Traffic Materials Branch Manager

Construction Division/M&P

Johnnie.miller@txdot.gov

 

Texas DOT use of NTPEP for traffic safety products

TxDOT utilizes NTPEP for pre-qualification testing of various traffic safety products including flexible delineator posts, raised pavement markers, prefabricated pavement markings, and retroreflective sheeting. The NTPEP testing program frees up state resources and provides manufacturers a uniform testing protocol by which products can be tested without the necessity of having to perform qualification testing in each individual state.

 

Example State Specifications

 

 

Raised Pavement Markers (RPM) Snowplowable Raised Pavement Markers (SRPM)

 

Overview

  • Evaluations are based on:
    • ASTM D4280, “Standard Specification for Extended Life Type, Nonplowable, Raise Retroreflective Pavement Markers."
    • ASTM D 4383, “Standard Specification for Plowable, Raised Retroreflective Pavement Markers."
  • RPM types evaluated include:
    • Standard Raised Pavement Markers (RPM)
    • Snow Plowable Raised Pavement Markers (SPRPM)
    • Temporary Raised Pavement Markers
    • Temporary Chip Seal Markers
  • RPM adhesives are also evaluated. Adhesive types include:
    • Standard Bituminous Adhesive
    • Flexible Bituminous Adhesive
    • Non-Bituminous Hot Melt Adhesive
    • Epoxy Adhesive
  • It is recommended that products be re-evaluated every 4 years.

 

Testing

  • Initial evaluations are performed on randomly sampled RPMs. Nonplowable and Snow Plowable RPMs are evaluated for:
    • Dimensional Measurements
    • Retroreflectivity
    • Compressive Strength
    • Lens Integrity
    • Temperature Resistance
    • Flexural Strength
    • Abrasion Resistance
  • Snow Plowable RPMs will also be evaluated for Holder Ramp Hardness.
  • Temporary RPMs and Chip Seal Markers are tested for retroreflectivity and hardness

 

Field Evaluation

  • RPM/SPRPMs are placed on a roadway and exposed to traffic and environmental conditions.
  • RPM/SRPM products are evaluated over a 2-year period at intervals of 6, 12, 18, and 24 months.
  • Temporary RPMs are evaluated over a 6-month period at monthly intervals.
  • Chip seal markers are evaluated for 1 month at weekly intervals.

 

Links

 

Additional information about this evaluation can be found at: http://www.ntpep.org/Pages/RPM.aspx

 

AASHTO National Transportation Product Evaluation Program (NTPEP) www.ntpep.org

 

AASHTO NTPEP DataMine https://data.ntpep.org/

 

Example State Specifications

 

 

Rapid-set Concrete Patching Materials (RSCP)

 

Overview

  • This evaluation includes most aspects of ASTM C928 “Standard Specification for Packaged, Dry, Rapid-Hardening Cementitious Materials for Concrete Repairs." Products types evaluated by this program are:
    • Cementitious, polymer modified, and polymer repair materials.
    • Products intended for horizontal use, vertical/overhead use, or both horizontal and vertical/overhead use.
  • Products may be tested neat (as packaged with nothing added other than water or liquid) and/or with extender aggregate.
  • The evaluation includes lab testing of all product types.
  • The evaluation includes a field trial of products intended for horizontal use and both horizontal and vertical/overhead use.
  • No field trial for products intended for vertical/overhead use only.
  • Retesting – Lab testing every 5 years.

 

Lab testing of Cementitious Products

 

ASTM C1583, “Bond Strength by Direct Tension"ASTM C882, “Bond Strength using Slant Shear"
AASHTO T 277, “Chloride Ion Penetration"AASHTO T 358, “Surface Resistivity"
AASHTO T 260, “Chloride Ion Content"AASHTO T 106, “Compressive Strength" neat
AASHTO T 22, “Compressive Strength" extendedAASHTO T 160, “Length Change"
*AASHTO T 161, “Resistance to Freeze/Thaw"AASHTO T 198, “Tensile Strength"
AASHTO T 131, “Time of Setting by Vicat Needle"ASTM C403, “Time of Setting by Penetration Resistance"

* Manufacturers must have products tested as per AASHTO T 161 Procedure A, Procedure B, or both.

 

Lab testing of Polymer Modified Products

 

ASTM C1583, “Bond Strength by Direct Tension"ASTM C882, “Bond Strength using Slant Shear"
AASHTO T 277, “Chloride Ion Penetration"AASHTO T 358, “Surface Resistivity"
AASHTO T 260, “Chloride Ion Content"AASHTO T 106, “Compressive Strength" neat
AASHTO T 22, “Compressive Strength" extendedAASHTO T 160, “Length Change"
*AASHTO T 161, “Resistance to Freeze/Thaw"ASTM C884, “Thermal Compatibility"
ASTM C403, “Time of Setting by Penetration Resistance" 

*  Manufacturers must have products tested as per AASHTO T 161 Procedure A, Procedure B, or both

 

Lab testing of Polymer Products

 

ASTM C1583, “Bond Strength by Direct Tension"ASTM C882, “Bond Strength using Slant Shear"
AASHTO T 277, “Chloride Ion Penetration"

ASTM C579, “Compressive Strength" neat and

extended

ASTM C403, “Time of Setting by Penetration Resistance"ASTM C881, “Gel Time (Pot Life)"
ASTM C884, “Thermal Compatibility"

ASTM C531, “Linear Shrinkage & Coefficient of

Thermal Expansion"

 

Extender Aggregate:

If the product is submitted for evaluation with extender aggregate, the aggregate is tested using the following methods:

  • AASHTO T 27, “Standard Method of Test for Sieve Analysis of Fine and Coarse Aggregates."
  • AASHTO T 103, “Standard Method of Test for Soundness of Aggregates by Freezing and Thawing" Procedure A.
  • AASHTO T 84 and/or T 85, “Standard Method of Test for Specific Gravity and Absorption of Fine Aggregate" and/or AASHTO T 85, “Standard Method of Test for Specific Gravity and Absorption of Coarse Aggregate."

 

Field evaluation

A test patch is prepared for each product with typical size of 9 feet long, 3 feet wide, and 4 inches deep. Manufacturers provide labor and equipment needed to install patching material. Field observations are made at the time of installation and at intervals of 12 and 24 months. The field trial provides for evaluation of edge debonding, percent of total area that becomes delaminated, and mid panel cracking. Photos are taken at the time of installation and each evaluation.

 

Links

Additional information about this evaluation can be found at: http://www.ntpep.org/Pages/RSCP.aspx

 

AASHTO National Transportation Product Evaluation Program (NTPEP) www.ntpep.org

 

AASHTO NTPEP DataMine https://data.ntpep.org

 

Example State Specifications

 

Sign Sheeting Materials (SSM) Roll Up Signs (RUP)

Overview

  • This evaluation is based on ASTM D4956 “Standard Specification for Retroreflective Sheeting for Traffic Control"
  • SSM work plan evaluates rigid and reboundable sign sheeting
    • 3-year accelerated outdoor exposure evaluation
    • Laboratory testing of new material
  • RUP work plan evaluates rollup sign sheeting materials
    • 1-year accelerated outdoor exposure evaluation
    • Laboratory testing of new material

 

Evaluation

Laboratory Evaluation

  • SSM and RUP
    • Coefficient of Retroreflection – ASTM E810
    • Daytime Color and Luminance Factor for non-Fluorescent Colors – AASHTO M 268
    • Daytime Color and Luminance Factor for Fluorescent Colors – ASTM E991
    • Flexibility – ASTM D4956
  • SSM only
    • Adhesive Properties – AASHTO M 268
    • Impact Resistance – ASTM D4956
    • Shrinkage – AASHTO M 268
    • Liner Removal properties – AASHTO M 268

 

Outdoor Exposure Evaluation

  • Test decks in Arizona, Louisiana, Minnesota, and Virginia
  • Tests Performed:
    • Coefficient of Retroreflection, ASTM E81
    • Lab and Portable Color, AASHTO M 26
    • Portable Retroreflectivity, ASTM E1709
    • Visual Evaluation:

 

- Shrinkage/Expansion- Cracking
- Blistering- White Spots
- Appearance- Comparison w/unexposed control sample

 

 

Links

 

Additional information about this evaluation can be found at: http://www.ntpep.org/Pages/SSMandRUP.aspx

 

AASHTO National Transportation Product Evaluation Program (NTPEP) www.ntpep.org

 

AASHTO NTPEP DataMine https://data.ntpep.org/

 

Success Stories

Iowa Department of Transportation

Manufactured products engineer

Scott Sommers, P.E.

515-239-1259

scott.sommers@iowadot.us

Iowa use of NTPEP for Sign Sheeting Materials

“With Reflective sheeting we used to do long term testing of this material on signs outside along with our normal reflective testing, Now with NTPEP we are able to utilize their data and our testing is limited to verification only which helps with other demands on our lab and personnel. “

 

 

Texas Department of Transportation

Johnnie S. Miller, P.E.

Coatings & Traffic Materials Branch Manager

Construction Division/M&P

Johnnie.miller@txdot.gov

Texas DOT use of NTPEP for traffic safety products

TxDOT utilizes NTPEP for pre-qualification testing of various traffic safety products including flexible delineator posts, raised pavement markers, prefabricated pavement markings, and retroreflective sheeting. The NTPEP testing program frees up state resources and provides manufacturers a uniform testing protocol by which products can be tested without the necessity of having to perform qualification testing in each individual state.

 

Example State Specifications

 

 

Temporary Traffic Control Devices (TTCD)

Overview

  • Product types evaluated are flexible delineator posts (ground mount and surface mount) and plastic work zone drums.
  • Manufacturers of TTCD products shall certify that the product meets all requirements as described in the “Manual of Uniform Traffic Control Devices" (MUTCD).
  • Flexible delineator post evaluations consist of both laboratory testing and comprehensive impact testing.
  • Plastic drum evaluations consist of a field trial only.

 

Lab Evaluation

  • Flexible delineator posts are evaluated for ASH Test (D5630), Density and Specific Gravity (D792), Yellowness Index (E313) and Daytime Luminance (E1347)
  • Lab testing is performed under NTPEP contract by Future Labs LLC, Madison MS.

 

Field Evaluation

  • TTCD products are subjected to an impact test. The impact vehicle used is a small sedan meeting the requirements of a MASH -16 1100C sedan.
  • The impact velocity for flexible delineator posts is dependent on the intended use of the product as follows:
    • Low Durability Side of Roadway Applications (55 mph) – Maximum of 10 impacts.
    • High Durability Metropolitan Delineator Applications (55 mph) – up to 200 impacts
    • High Speed High Durability Applications (70 mph) – up to 200 impacts
  • The impact velocity for plastic drums is 55 +/- 2 mph.
  • Delineator Impact tests are performed in warm weather, (≥ 81 degrees), and again in cold weather, (≤ 34 degrees).
  • After specified numbers of impacts (Run 1, 10, 50, 100, 150 and 200) the following observations will be documented:
    • The product is inspected to detect any splits, cracks, breaks or other forms of distress.
    • The approximate percentage of the reflective area that is damaged is measured.
    • The percent list/lean from vertical is measured for delineators. 
  • The following additional observations will be documented:
    • Observed installation issues including the performance of bonding agents used to adhere the delineator to the roadway surface.
    • Observed issues related to special equipment or techniques required to installation or removal of delineators.
    • Observed proble ms associated with restacking drums after 10 impacts.

 

Links

 

Additional information about this evaluation can be found at: http://www.ntpep.org/Pages/TTCD.aspx

 

AASHTO National Transportation Product Evaluation Program (NTPEP) www.ntpep.org

 

AASHTO NTPEP DataMine https://data.ntpep.or

 

 

Example State Specifications

 

 

 

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