Evaluation of the Texas tier system for seal coat binder specification.
Advanced Search
Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.

Search our Collections & Repository

All these words:

For very narrow results

This exact word or phrase:

When looking for a specific result

Any of these words:

Best used for discovery & interchangable words

None of these words:

Recommended to be used in conjunction with other fields



Publication Date Range:


Document Data


Document Type:






Clear All

Query Builder

Query box

Clear All

For additional assistance using the Custom Query please check out our Help Page


Evaluation of the Texas tier system for seal coat binder specification.

Filetype[PDF-637.25 KB]

  • English

  • Details:

    • Publication/ Report Number:
    • Resource Type:
    • Geographical Coverage:
    • NTL Classification:
      NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance;NTL-HIGHWAY/ROAD TRANSPORTATION-Construction and Maintenance;
    • Abstract:
      The Texas Department of Transportation (TxDOT) instituted a change in their seal coat binder specification in 2010 which allowed districts to select multiple binders within specified traffic levels or tiers for the purposes of allowing contractors to bid the work with the most economical binder available to them. Known as the tier system, it is estimated that this approach has saved TxDOT over $33 million in the 2.5 years that it has been used. While this savings is substantial, it was recognized that refinements to the tier system were needed to address specific performance problems. This research project was initiated to poll TxDOT district personnel, contractors, and chip seal binder suppliers to ascertain how the tier system was working, what modifications could be made to improve performance, and what other issues needed to be addressed. Although the tier system is generally working as intended, there are opportunities for improvement. These include an expanded education effort for all levels of TxDOT personnel involved in chip seal construction, changing traffic requirements to reflect cumulative and truck characteristics, keeping the tier system for district wide chip seal programs, updating the current chip seal manual, developing standards for pavement preparation ahead of sealing, allowing more flexibility for selecting binders for individual projects, developing generic chip seal binder specifications, removing aggregate requirements from the current tier system, initiate research into the development of a good winter binder, and initiate research into the development and application of seal coat test methods.
    • Format:
    • Main Document Checksum:
    • File Type:

    Supporting Files

    • No Additional Files

    More +

    You May Also Like

    Checkout today's featured content at rosap.ntl.bts.gov

    Version 3.26