INFRARED ABSORPTION TESTS ON PARTIALLY HYDRATED CEMENT PASTES AND PURE PHASES

Partially hydrated cement pastes of 4 kinds of commercial cement, which differ mainly in their C3A contents, and synthesized pure phases of hydrated compounds were tested by an infrared absorption spectroscopic method. The IR spectra of the partially hydrated cements were almost identical to the spectrum of hydrated alite, especially at later curing ages, except for the absorption of the sulfate ion. The sulfate ion absorption decreased gradually with curing age, up to 365 days or more. This suggested that the composition of the hydrous calcium sulfoaluminate phase was changing. The decrease of sulphate ion absorption was somewhat larger in the case of white portland cement than in the case of grey portland cement. The form of gypsum in unhydrated cement and the bonding of OH to the minus power ion in pure phases are discussed. /Author/

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 41-46
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00141051
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Oct 6 1976 12:00AM