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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Monitoring of Portland cement chemical reaction and quantification of the hydrated products by XRD and TG in function of the stoppage hydration technique

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Author(s):
Maciel, Marcel Hark [1] ; Soares, Gabriela Simoes [1] ; Romano, Roberto Cesar de Oliveira [1] ; Cincotto, Maria Alba [1]
Total Authors: 4
Affiliation:
[1] Univ Sao Paulo, Dept Civil Construct Engn, Av Prof Almeida Prado, Trav 2, 83, BR-05424970 Sao Paulo, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY; v. 136, n. 3, p. 1269-1284, MAY 2019.
Web of Science Citations: 5
Abstract

Cement hydration occurs according to a sequence of reactions whose products have a direct influence on the working properties of concretes and mortars during their use. The understanding of the evolution of its formation is quite simple and focused on monitoring the identification of resulting hydrate formed and their corresponding quantification by content of bound water after hydration stoppage and drying at certain set periods of time. Among the more common techniques are the methods of direct drying, where free water is eliminated by evaporation or sublimation or by replacing the existing water with organic solvents and then evaporating them. The existing doubts about the effect of these treatments in the change of the hydrate composition make it difficult to obtain an accurate determination. This work aimed to assess the impact of the stoppage of the hydration reaction of CPV (cement Portland type V from Brazilian market) in the results obtained by freeze-drying or immersion in an organic solvent as isopropanol or acetone, followed by substitution for diethyl ether. This last step is aimed at dispensing with the need for elevated temperatures or other aggressive solvent elimination methods such as evaporation under low pressure. The hydration was monitored at the previously set periods, and the hydrated products were analyzed by thermogravimetry and X-ray diffractometry. The results indicate that the technique of immersion on isopropanol and drying with diethyl ether is the most suitable one, as it does not affect the hydrated product composition. (AU)

FAPESP's process: 14/50948-3 - INCT 2014: advanced eco-efficient technologies in cementitious products
Grantee:Vanderley Moacyr John
Support Opportunities: Research Projects - Thematic Grants