PCC Joint Sealants (JS)
Joint Sealants are commonly used to protect and seal Portland Cement Concrete (PCC) pavement joints. Under this NTPEP evaluation program, both hot-poured and cold-applied joint sealant materials are field tested for three years and laboratory tested according to a variety of ASTM specified test methods.
Moisture is a key ingredient in the development of many durability-related distress types. As a result, these distress types are often observed to be much more severe at joints and cracks, where moisture can penetrate the concrete from several surfaces. Sealing joints and cracks can help reduce the amount of infiltrated water. However, the effectiveness of sealing depends on several issues:
- How much water will be prevented from infiltrating by sealing the joint or crack?
- What other sources are contributing moisture and what’s the volume of this water?
- How long will the sealant be effective at reducing the infiltration of water?
It is impossible to completely eliminate the intrusion of moisture at joints and cracks, especially for an extended period of time. A Minnesota study found that the amount of infiltrated water (measured using tipping buckets at drainage outlets) returned to the same levels within 2 weeks after resealing (Hagen and Cochran 1995). This confirms that moisture can continue to penetrate the concrete at joints and at other locations, making this approach a short-term solution under the best of circumstances. (SOURCE: FHWA/TFHRC)
HMA Crack Sealers (CS)
AASHTO is pleased to announce the launch of a coordinated evaluation of Crack Sealers for HMA pavements under the auspices of its National Transportation Product Evaluation Program (NTPEP).
Crack Sealers are commonly used to protect and seal Hot Mix Asphalt (HMA) pavement cracks from moisture and other deleterious material. Under this NTPEP evaluation program, the sealers are field tested for three years and laboratory tested according to a variety of ASTM specified test methods.
The NTPEP Technical Committee responsible for authoring the Project Work Plan for both Joint Sealants and Crack Sealers convenes yearly at the NTPEP National (Annual) Meeting. During this working meeting, the Project Work Plan is discussed, changes made, and shortly thereafter balloted for adoption. Improvements are immediately implemented in the next available testing cycle. The work plan can be found by clicking on the “Documents” tab above. When compared to other standards development exercises, the NTPEP process is agile, effective, and efficient.
NTPEP Designated Labs:
- North Carolina Department of Transportation
- Minnesota Department of Transportation
- Minnesota Department of Transportation
NTPEP - PCC Joint Sealants and HMA Crack Sealers
Annual meeting minutes are combined with attendance sheets and, if available, presentations.
2020 Annual Meeting Virtual
2019 Fall Conference Call
2019 Annual Meeting Big Sky, MT
2019 Spring Conference Call
2018 Fall Conference Call
2018 Summer Conference Call
2018 Annual Meeting Norfolk, VA
2018 Winter Conference Call
2017 Summer Conference Call
2017 Spring Conference Call
2017 Annual Meeting Boston, MA
2016 Fall Conference Call
2016 Annual Meeting Grand Rapids, MI
2015 Annual Meeting Scottsdale, AZ
2015 Spring Conference Call
2015 Winter Conference Call
2014 Fall Conference Call
NTPEP JS-CS User Guide
NTPEP tests products according to a Project Work Plan, which describes the laboratory and/or field test protocols used to conduct the evaluation. The Project Work Plan is a consensus-based document and includes peer review and input from industry experts. Each Project Work Plan is adopted after receiving at least two-thirds affirmative support from 52 AASHTO member states. The Project Work Plan is the basis for host states to conduct their testing and evaluation. When implemented by state DOTs, their own state standard specifications may supersede the NTPEP Project Work Plan. Industry is advised to be aware of state-level requirements, which may supersede basic NTPEP testing.