WATER SORPTION AND DESSICCATION IN A PORTLAND CEMENT PASTE: POSITRON ANNIHILATION RESULTS
G. Consolatia, G. Dotellib and F. Quassoa
aDipartimento di Fisica and Istituto Nazionale per la Fisica della Materia Politecnico di Milano, 20133 Milan, Italy
bDipartimento di Chimica Industriale ed Ingegneria Chimica "G. Natta" Politecnico di Milano, 20133 Milan, Italy
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Positron annihilation experiments were carried out on a Portland cement paste one year aged, which was subjected to cycles of dessiccation and subsequent water resaturation, in order to study possible changes of the porosity. Analysis of the annihilation time spectra suggests that drying and rewetting treatments do not induce irreversible modifications in the configuration of the finest gel pores.
DOI: 10.12693/APhysPolA.99.345
PACS numbers: 78.70.Bj, 71.60.+z, 81.05.Rm