title: Recent advances of ultrasonic testing of cement based materials at early ages.
abstract: To summarize some of the most important findings in the field of ultrasonic (US) testing of early age hydration and formation of structure of different cement based materials (CBMs), a review of literature with focus on US P-wave transmission and S-wave reflection methods is presented in this paper. The review shows a great ability of both US techniques to observe setting phenomena and to determine different milestones during the early age formation of CBM's microstructure. Clear physical basis, high accuracy, and non-destructive nature of the method indicate that US methods could become standardized in the near future.
authors.affiliation: IGMAT Building Materials Institute, Polje 351c, 1000 Ljubljana, Slovenia. Electronic address: grega.trtnik@igmat.eu.
authors.forename: Gregor
authors.initials: G
authors.lastname: Trtnik
authors.forename: Matija
authors.initials: M
authors.lastname: Gams
mesh_terms: D000268:Adhesiveness; D000269:Adhesives / Q000032:analysis* / Q000737:chemistry*; D008422:Materials Testing / Q000379:methods*; D014463:Ultrasonography / Q000379:methods* / Q000639:trends*
chemical_list: D000269:Adhesives
keywords: Cement based materials; P-wave velocity; S-wave reflection coefficient; Setting; Ultrasound