Adhesion testing procedure for hot-poured crack sealants.

Details

• Creators:
  Al-Qadi, Imad L. ; Fini, Eli H. ; Figueroa, Hector D. ; Masson, Jean-Francois Masson ; McGhee, Kevin K.
• Corporate Creators:
  University of Illinois at Urbana-Champaign. Department of Civil and Environmental Engineering ; Quality Engineering Solutions, Inc. ; National Research Council Canada ; Virginia Transportation Research Council (VTRC)
• Corporate Contributors:
  United States. Federal Highway Administration ; Virginia. Dept. of Transportation
• Subject/TRT Terms:
  • Pavement design
  • Pavement components
  • Pavement cracking
  • Pavement layers Pavements
• Publication/ Report Number:
  ICT-08-026, UILU-ENG-2008-2014
• Resource Type:
  Tech Report
• Geographical Coverage:
  Illinois
• Corporate Publisher:
  Illinois Center for Transportation
• Abstract:
  Crack sealing is a common pavement maintenance treatment because it extends pavement service life significantly. ; However, crack sealant often fails prematurely due to a loss of adhesion. Because current test methods are mostly ; empirical and only provide a qualitative measure of bond strength, they cannot predict sealant adhesive failure accurately. ; Hence, there is an urgent need for test methods based on bituminous sealant rheology that can better predict sealant field ; performance. This study introduces three laboratory tests aimed to assess the bond property of hot-poured crack sealant to ; pavement crack walls. The three tests are designed to serve the respective needs of producers, engineers, and ; researchers. The first test implements the principle of surface energy to measure the thermodynamic work of adhesion, ; which is the energy spent in separating the two materials at the interface. The work of adhesion is reported as a measure of ; material compatibility at an interface. The second test is a direct adhesion test, a mechanical test which is designed to ; closely resemble both the installation process and the crack expansion due to thermal loading. This test uses the Direct ; Tensile Test (DTT) machine. The principle of the test is to apply a tensile force to detach the sealant from its aggregate ; counterpart. The maximum load, Pmax, and the energy to separation, E, are calculated and reported to indicate interface ; bonding. The third test implements the principles of fracture mechanics in a pressurized circular blister test. The apparatus ; is specifically designed to conduct the test for bituminous crack sealant, asphalt binder, or other bitumen-based materials. ; In this test, a fluid is injected at a constant rate at the interface between the substrate (aggregate or a standard material) ; and the adhesive (crack sealant) to create a blister. The fluid pressure and blister height are measured as functions of time; ; the data is used to calculate Interfacial Fracture Energy (IFE), which is a fundamental property that can be used to predict ; adhesion. The stable interface debonding process makes this test attractive. This test may also provide a means to quantify ; other factors, such as the moisture susceptibility of a bond. In addition, the elastic modulus of the sealant and its residual ; stresses can be determined analytically. While the direct adhesion test is proposed as part of a newly developed ; performance-based guideline for the selection of hot-poured crack sealant, the blister test can be used to estimate the ; optimum annealing time and installation temperature.
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• Format:
  PDF
• Funding:
  VTRC Project # 67775;TPF-5(045)
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/16703/dot_16703_DS1.pdf
• File Type:
  [PDF - 1.36 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:25f5ddb7820a9cf9bf0f3d04aa22e9a262360f17fa1e616e570ea2adeabe5eac7b0a0657e324e70401b1593b2404adae638f27d7b8fb928554f2e2f33b0aac63