United States Department of Transportation
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Mitigation of Potential Alkali-Silica Reactivity Using Lithium (SHRP Concrete and Structures ASR Showcase Test and Evaluation Project 34)
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2002-08-01
[PDF-321.56 KB]
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Edition:Final Report September,1995 to August, 2002
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Abstract:This research involved participation in an FHWA-sponsored round robin testing program using the AASHTO TP-14 procedure for accelerated testing of Alkali-Silica Reactive aggregates. In addition, thirteen Portland cement concrete pavement test sections were constructed incorporating fly ash, lithium compounds and pozzolan modified cement as mitigation techniques. These test sections will be monitored for four more years to gauge the effectiveness of the various treatments using static modulus testing and comparing all results against a control section with no treatment. Several of the treatment protocols involved the use of a combination of an F fly ash with different addition levels of lithium admixtures which constitutes the most potentially economical method for mitigation using lithium compounds. Six test sections using various amounts of neutral lithium compounds on an existing pavement suffering from severe ASR distress were also established by spraying solutions onto the slab. Initial results, based on static modulus values before and after treatment, are encouraging but further data must be collected before conclusive evidence of a positive benefit.
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