TO PREPARE THIS CHAPTER, THE CONTENTS OF ALL of the previous editions were drawn on. The author acknowledges the previous authors, Ephraim Senbetta [1], Rodger Carrier [2], C. E. Proudley [3], and John Swanberg [4]. The title of the chapter was changed from “Curing and Curing Materials” to reflect the change in scope of ASTM Subcommittee C09.22, which has initiated efforts to provide standards for materials that do not fulfill the curing function but are not addressed elsewhere, such as evaporation reducers, silicate treatments, bond breakers, and dry shake hardeners. The current edition will review and update the topics addressed by the previous authors, introduce new technology and perspectives, and include up-to-date references.