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In recent years, supplies of high-quality, freshly produced coal ash have declined due to increasing environmental controls and shutdowns of coal-fired powerplants in the United States and elsewhere. While supply has decreased, demand for coal ash for concrete construction is the same or greater, as coal ash is a crucial component for producing sustainable and durable concrete.
NCHRP Research Report 1105: Use of Marginal and Unconventional-Source Coal Ashes in Concrete, from TRB's National Cooperative Highway Research Program, aims (1) to propose revisions to AASHTO M 295 Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete to allow use of unconventional coal ashes while not compromising the desired properties of the fresh and hardened concrete, and (2) to provide guidelines for using coal ash not meeting the proposed revised specification.
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