title: Heavy ion beam measurement of the hydration of cementitious materials.
abstract: The setting and development of strength of Portland cement concrete depends upon the reaction of water with various phases in the Portland cement. Nuclear resonance reaction analysis (NRRA) involving the (1)H((15)N,alpha,gamma)(12)C reaction has been applied to measure the hydrogen depth profile in the few 100 nm thick surface layer that controls the early stage of the reaction. Specific topics that have been investigated include the reactivity of individual cementitious phases and the effects of accelerators and retarders.
authors.affiliation: Materials Science & Engineering Department, University of Maryland, College Park, MD 20742, USA. Rliving1@umd.edu
authors.forename: R A
authors.initials: RA
authors.lastname: Livingston
authors.forename: J S
authors.initials: JS
authors.lastname: Schweitzer
authors.forename: C
authors.initials: C
authors.lastname: Rolfs
authors.forename: H-W
authors.initials: HW
authors.lastname: Becker
authors.forename: S
authors.initials: S
authors.lastname: Kubsky
authors.forename: T
authors.initials: T
authors.lastname: Spillane
authors.forename: J
authors.initials: J
authors.lastname: Zickefoose
authors.forename: M
authors.initials: M
authors.lastname: Castellote
authors.forename: P G
authors.initials: PG
authors.lastname: de Viedma
authors.forename: J
authors.initials: J
authors.lastname: Cheung
mesh_terms: D007477:Ions; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008420:Manufactured Materials / Q000032:analysis* / Q000528:radiation effects; D008422:Materials Testing / Q000379:methods; D014867:Water / Q000032:analysis* / Q000737:chemistry*
chemical_list: D007477:Ions; D014867:Water