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From page 1...
... 1Inorganic processing additions (referred to as processing additions or PAs hereafter) , such as granulated blast furnace slag and fly ash, are interground with clinker in the manufacture of some portland cements, primarily to improve the efficiency of manufacturing.
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... highway pavements and structures was collected and reviewed. This information included domestic and foreign literature, contacts with public and private agencies and industry organizations, and other sources.

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