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1 Introduction
Pages 4-7

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From page 4...
... Synthesis Objective and Needed Information The objective of this synthesis is to document state DOT practices for specifying and using SCMs in concrete that is used in transportation infrastructure applications. Information gathered as part of this project includes: • The types of SCMs allowed by state DOTs; • Primary reasons, use, and application types of different SCMs; • Use of NPs and harvested ash; • Percent replacement of Portland cement by different SCMs in binary and ternary mixtures; • Challenges associated with the use of SCMs; • Practices for monitoring the quality of SCMs; • Availability of fly ash and how state DOTs are responding to the shortage of fly ash; • Use and availability of ASCMs; • Types of demonstration projects for ASCMs; and • Use of ASCMs in conventional DOT concrete specifications.
From page 5...
... The decline in the availability of fly ash has presented challenges for many state DOTs and has prompted them to take actions to compensate for the shortage. These actions include modifying DOT specifications, importing fly ash, increasing the use of other conventional SCMs and natural pozzolans, and harvesting coal ash/bottom ash from landfills and then reprocessing it to meet current fly ash specifications (ASTM C618-23/AASHTO M 295)
From page 6...
... The sub sequent rehabilitation process involves drying, filtering harmful materials, calcinating to reduce the carbon content and agents, and finely grinding the material to 45 μm or less to activate its pozzolanic characteristics. Natural Pozzolans NPs, such as clay-kaolin, shale, slate, and pumice, are earthen materials that may exist naturally and may have resulted from volcanic activity producing volcanic ash.
From page 7...
... It discusses guides and practices of the American Concrete Institute (ACI) , FHWA reports, technical briefs, TRB papers, NCHRP reports, university publications, industry technical information, ASTM standards, and publications prepared outside the United States.


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