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Development of the crack sealant adhesion test.

File Language:
English


Details

  • Alternative Title:
    Project title: Evaluation of the overlay tester for adhesion testing of crack sealants
  • Creators:
  • Corporate Creators:
    Texas Transportation Institute
  • Subject/TRT Terms:
  • Publication/ Report Number:
    FHWA/TX-09/0-5457-2
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Texas
  • Edition:
    Technical report; Sept. 2006-Feb. 2008.
  • Corporate Publisher:
    Texas Transportation Institute
  • Abstract:
    Crack sealants are widely used in Texas to prevent water from entering into lower structural layers thereby

    extending pavement life. However, most current crack sealants have been reported to have a very short life mainly due

    to adhesive failures. Although adhesive failure is known to be the major failure mechanism very little attention has

    been paid to measuring this property in the laboratory. The main objective of this project was to develop a

    performance related adhesion test using TxDOT’s Overlay Tester.

    In this report the crack sealant adhesion test protocol developed in year 1 of this study was finalized. The final

    test protocol includes a molding jig, a detailed sample preparation procedure, an adhesion test protocol, and criteria for

    interpreting the results. In this study 13 sealants (some of them have never been used in Texas) were evaluated

    following the proposed test protocol. The results clearly showed that the crack sealant adhesion test can effectively

    differentiate the poor sealants from the good ones. Furthermore, based on these test results, a draft crack sealant

    special specification was proposed. This is different from the current specification, which is mainly based on crumb

    rubber content. The new special specification is based on the results of the new adhesion test. In addition to this

    performance test other complementary factors such as flash point, softening point, and viscosity have been included in

    the new specification. In the proposed specification, the sealants are classified as: Type A (min. 100 cycles to failure

    at 45 ºF), Type B (min. 400 cycles to failure at 45 ºF), and Type C (min. 400 cycles to failure at 33 ºF). In addition,

    preliminary recommendation on optimum sealant types were made for each district in the state based on climatic

    conditions (freeze thaw cycles). Finally, an experimental test plan was developed to validate the draft special

    specification.

  • Format:
    PDF
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:f1c71cde1ab646eea41ad170e2d8c94fdfecb37d283d2e9f18b04e815e0cd51dd17019aa18e565dd367bcc9a6a6204dd273af817d972561b8cc3d9b454c7f122
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  • File Type:
    Filetype[PDF - 1.14 MB ]
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