United States Department of Transportation
i
Implementing AASHTO TP 110 for Alkali-Silica Reaction Potential Evaluation of Idaho Aggregates
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2020-05-01
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[PDF-3.62 MB]
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Edition:07/08/2018 - 12/31/2019
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Abstract:Alkali-Silica Reaction (ASR) has been recognized as a major distress in concrete for over a century. In the United States, ASR is a major cause of the deterioration of highway concrete structures. In Idaho, several aggregate sources have been reported to be ASR-susceptible. The primary objective of the current research study was to evaluate the advantages associated with implementing AASHTO TP-110 (Miniature Concrete Prism Test, [MCPT]) within ITD specifications to characterize the ASR susceptibility of Idaho aggregates. This test method has been recently adopted by AASHTO as T 380. In this research study, a total of 14 different aggregate materials (both coarse and fine fractions), including a non-reactive reference aggregate, were collected from various sources across and adjacent to Idaho, and were tested using the 56-days MCPT as well as the commonly used Accelerated Mortar Bar Test (AMBT; ASTM C 1260). Additionally, the 1-year Concrete Prism Test (CPT; ASTM C 1293) was carried out on selected aggregates. Finally, a shortened version of the ASTM C 1293 test was also explored to assess its suitability for application. The results demonstrated that all aggregate materials (both coarse and fine fractions) tested in the current study were ASR-susceptible. Overall, the MCPT results were found to correlate well with the 14-day AMBT test results. As all the aggregate materials were found to be ASR-susceptible, no instance of false-positive or false-negative results were encountered in the current study. Although the results from this new method were found to be consistent with the other methods (in terms of deciding whether a particular aggregate was reactive or not), better evaluation of the test method will be possible only when the results are compared against field performance of aggregates. The study therefore recommends the Idaho Transportation Department (ITD) to initiate other studies where the laboratory test results can be compared with field performance of aggregates in terms of ASR susceptibility. Moreover, these studies should focus on testing both reactive as well as non-reactive aggregates.
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