Abstract

MORENO-VIRGEN, M.R. et al. Laser Radiation CO₂ Effects in Cement Paste at Different Hydration Stages after Preparation. Ing. invest. y tecnol. [online]. 2011, vol.12, n.3, pp.321-328. ISSN 2594-0732.

In this work the changes occurring in cement pastes irradiated by 10.6¡mi CO₂ laser at different stages of hydration after preparation are presented. Raman spectroscopy, X-ray diffraction and Scanning Electronic Microscopy (SEM) techniques were used to observe molecular structural changes. Intensity of cement paste Raman peaks after laser irradiation was monitored in samples irradiated 2, 3, 4, 5, 6, 7, 8, 9,10 and 11 days after their preparation. Applied laser power changed Raman peaks intensity at 187.5cm-1,563cm-1, 695cm-1, 750cm-1, 897cm-1,1042cm-1 and 1159cm-1 that correspond to compounds already present in cement pastes. X-ray diffraction, SEM images and changes in the Raman peaks confirm the recrystalization of cement paste compounds into new phases (alite and belite) after irradiation. The produced changes show a clear dependence on the applied laser power density and age of samples.

Keywords : cement paste; laser; characterization; hydration stages.

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