Abstract
Abstract Materials such as magnesium phosphate cement (MPC) have attracted significant attention of researchers, therefore, understanding the effects of dosage parameters, such as water content and MgO/NH4H2PO4 ratio on phase formation is essential for obtaining cementitious matrices with improved performance. In the present work MgO was sintered at 900 °C and 1110 °C in a conventional oven, and the effect of water concentration and MgO/NH4H2PO4 (or ADP) ratio on the properties of MPC was evaluated in terms of phase formation by X-ray diffraction, pore size distribution, mechanical properties, and microstructure. For less-reactive MgO (calcined at 1100 °C) with a high MgO/ADP ratio, increased water content did not cause additional solubilization of ADP or formation of more hydrated phases, although the cement porosity increased. Compositions with more reactive MgO (calcined up to 900 °C) formed dittmarite (NH4MgPO4.H2O) independent of water content. Higher water content and MgO calcination temperature were associated with increased MPC setting time and decreased mechanical strength due to higher porosity.
Highlights
Sintering of ceramic materials is an important research topic, this process entails significant energy consumption and cost when implemented at a large scale
Since a consolidated dosage method for magnesium phosphate cement (MPC) has not been reported yet, this study aims to evaluate the influence of water content and magnesium oxide (MgO)/ammonium dihydrogen phosphate (ADP) ratio on the properties of MPC using MgO calcined at different temperatures, formation reactions, microstructure, porosity, and mechanical strength of these materials
The chemical purity of MgO provided by the manufacturer was 96.28%, which was close to the experimental value, 97.26%
Summary
Sintering of ceramic materials is an important research topic, this process entails significant energy consumption and cost when implemented at a large scale. The energy demand and the resource consumption are some of the environmental issues that have generated a major interest in the modern society[1,2]. Bonded materials, such as ordinary Portland cement (OPC), can be used as an alternative to sintering ceramic materials. Formed by hydraulic chemical reactions, this material acquires mechanical resistance at ambient temperature, is low in cost, and is useful for applications that consume significant material. Not all applications are entirely satisfied by either class of materials, indicating a need for other materials with intermediate properties such as chemically bonded phosphate ceramics (CBPCs), to fill this gap[6]
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