Methods for Evaluating Fly Ash for Use in Highway Concrete (2013) / Chapter Skim
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1 Background Fly ash -- a byproduct of coal combustion -- is widely used as a cementitious and pozzolanic ingredient in hydraulic cement concrete. The use of coal fly ash (CFA)
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2Overview of the Project The research to evaluate new and existing test procedures involved the following five tasks that were performed as separate studies: • Review of existing specification and testing environment • Characterization of coal fly ash • Evaluation of approaches for characterizing strength activity • Evaluation of test methods for characterizing the effects of carbon on air entrainment • Evaluation of approaches for assessing ASR mitigation Existing Specification and Testing Environment This task was accomplished by reviewing the literature pertaining to CFA tests and specifications. Also, a survey of state highway agencies (SHAs)
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3 this task investigated whether the ASTM C1567 rapid mortar bar test provides better guidance than ASTM C441 and should therefore be included in AASHTO M 295. For this purpose, ASTM C1293 concrete prism tests were conducted to provide a reference.
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4and direct adsorption isotherm test can be used as a means for identifying those CFA sources that have a potential to adversely affect air entrainment. The CFA iodine number test is recommended for use as a screening test.
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