United States Department of Transportation
i
Performance of Adhesive and Cementitious Anchoring Systems
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2017-08-01
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[PDF-3.13 MB]
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Abstract:This research project evaluated the behavior of adhesive and cementitious bonded anchoring systems per the approach found in the provisional standard AASHTO TP-84, in order to provide recommendations pertaining to the test method. Additional parameters studied included installation direction and extreme in-service temperatures. Polymer characterization testing of adhesive products was also conducted in order to comment on technique usefulness for quality assurance and quality control of field-installed bonded anchor materials. While AASHTO TP-84 is a promising test method, adoption is not recommended unless it is adopted nationally. Recommendations are provided to improve the method, and the test method is not applicable to materials with higher variability in static test results, as measured by coefficient of variation in results. Some concerns still persist regarding physical aging on bonding materials. Based on a small sample of tests, there is concern regarding material performance in tension should the temperature drop below the manufacturer recommended installation temperature during the life of the anchor. Polymer characterization testing is expected to be a useful tool for quality assurance and quality control of anchor materials. A proposed implementation plan is included to allow anchor approval; however, the prohibition on sustained pure tension load should remain in place.
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