Development of the crack sealant adhesion test.

Details

• Alternative Title:
  Project title: Evaluation of the overlay tester for adhesion testing of crack sealants
• Creators:
  Hu, Xiaodi ; Zhou, Fujie ; Scullion, Tom
• Corporate Creators:
  Texas Transportation Institute
• Subject/TRT Terms:
  • Pavements
  • Sealing compounds
  • Pavement cracking
  • Overlays (Pavements) Pavements--Texas--Overlays--Testing
  • Sealing compounds--Texas--Testing
  • Pavements--Cracking--Texas
• 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.
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/16840/dot_16840_DS1.pdf
• File Type:
  [PDF - 1.14 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:f1c71cde1ab646eea41ad170e2d8c94fdfecb37d283d2e9f18b04e815e0cd51dd17019aa18e565dd367bcc9a6a6204dd273af817d972561b8cc3d9b454c7f122