Monitoring the dynamics of Portland cement hydration through photoluminescence and other correlated spectroscopy techniques

Author(s)

dos Santos, Valdemir ^[1] ; Denzin Tonoli, Gustavo Henrique ^[2] ; Marmol, Gonzalo ^[1] ; Frias, Moises ^[3] ; Savastano Jr, Holmer

Affiliation

^[1] Univ Sao Paulo, Res Nucleus Mat Biosyst, Duque de Caxias Norte St 225, BR-13630000 Pirassununga, SP - Brazil

^[2] Univ Fed Lavras, CP 3037, Lavras, MG - Brazil

^[3] Eduardo Torroja Inst Construct Sci IETcc CSIC, Madrid 28033 - Spain

• Document type: Journal article
• Source: CONSTRUCTION AND BUILDING MATERIALS; v. 252, AUG 20 2020.
• Web of Science Citations: 0

Abstract

Photoluminescence Spectroscopy was used in order to further understand cement hydration within the first hours of hydration (1 until 1024 min). The results showed a formation of C-S-H initially after 1 min of hydration and a growing process up to 32 min. This growth process fluctuates in a sinusoidal trend with the crystallographic arrangement (structural order/disorder), allowing the monitoring of cement hydration. The same sinusoidal tendency was observed for other chemical compounds such as CaCO3, C-H as well and confirmed by Thermogravimetric Analysis and Infrared Spectroscopy. The same process was observed for calcium and silicon ions by the use of different techniques as Atomic absorption spectrometry and ionic conductivity, in order to validate the method. All the used methods show very satisfying alignment. (C) 2020 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 17/10123-3 - Dimensional stability study in carbon fiber cement composites using carbonated water and with the aid of sodium bicarbonate
• Grantee: Valdemir dos Santos
• Support Opportunities: Scholarships in Brazil - Post-Doctoral