CUED Publications database

Thermogravimetric study on the hydration of reactive magnesia and silica mixture at room temperature

Jin, F and Al-Tabbaa, A (2013) Thermogravimetric study on the hydration of reactive magnesia and silica mixture at room temperature. Thermochimica Acta, 566. pp. 162-168. ISSN 0040-6031

Full text not available from this repository.

Abstract

The synthesis of magnesium silicate hydrate (MSH), which has wide applications in both construction and environmental fields, has been studied for decades. However, it is known that the characteristics of magnesia (MgO) vary significantly depending on their calcination conditions, which is expected to affect their performance in the MgO-SiO2-H2O system. This paper investigated the effect of different MgO and silica sources on the formation of magnesium silicate hydrate (MSH) at room temperature. The hydration process was studied by mixing commercial reactive MgO and silica powders with water and curing for 1, 7 and 28 days. The hydration products were analysed with the help of X-ray diffraction (XRD) and thermogravimatric analysis (TGA). The results showed the continuous consumption of MgO and the existence of MSH and brucite and other minor phases such as magnesite and calcite. It is found that the Mg and Si sources have significant effect on the hydration process of MgO-SiO2-H2O system. The reaction degree is controlled by the availability of dissolved Mg and Si in the solution. The former is determined by the reactivity of MgO and the latter is related to the reactivity of the silica as well as the pH of the system. © 2013 Elsevier B.V. All rights reserved.

Item Type: Article
Uncontrolled Keywords: Magnesium silicate hydrate MgO pH Reactivity TGA XRD
Subjects: UNSPECIFIED
Divisions: Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:28
Last Modified: 16 Dec 2014 19:05
DOI: 10.1016/j.tca.2013.05.036