Abstract
This paper investigates the mineralogical evolution of sulfoaluminate clinker elaborated from moroccan prime materials limestone, shale and phosphogypsum as a byproduct from phosphoric acid factories. The advantage of the production of this type of clinker is related to the low clinkerisation temperature which is known around 1250°C, and to less consumption quantity of limestone thus enabling less CO2 emissions during the decarbonation process compared to that of Portland cement. In this study we determine the stability conditions of belite sulfoaluminate clinker containing belite (C2S) ye’elimite (C4A3$) and ternesite (C5S2$). The hydration compounds of this clinker are also investigated. The monitoring of the synthesized and hydrated phases is performed by X-Ray Diffraction and Infrared spectroscopy. The results show the formation of ternesite at 800°C and the stabilization of clinker containing y’elminite, belite and ternesite at temperatures between 1100 and 1250°C.
Highlights
The literature relating to sulfo-aluminate cement is abundant, but remains much less vast than that dealing with Portland cement
The production of sulfo-aluminate cements has two advantages compared to that of Portland cement: on the one hand, the temperature of firing is less high and on the other hand, the manufacturing of this cement requires the consumption of a less quantity of limestone, which reduces the CO2 emissions during the decarbonation process, compared with that of Portland cement, the manufacturing of sulfoaluminate cement makes it possible to reduce of almost 35% the carbon dioxide emissions [1]
This work concerned the sulfoaluminate clinker characterized by the presence of CaO → 2CaO.SiO2 (C2S), C4A3$ (Ye'elimite) and of C5S2$
Summary
The literature relating to sulfo-aluminate cement is abundant, but remains much less vast than that dealing with Portland cement. Sulfo-aluminate cements are relatively recent hydraulic binders, these cements are still little known differently than by specialists. They present unquestionable assets and many potential applications. The ecological advantages of these cements arouse the interest of the researchers. The production of sulfo-aluminate cements has two advantages compared to that of Portland cement: on the one hand, the temperature of firing is less high (approximately 1250°C) and on the other hand, the manufacturing of this cement requires the consumption of a less quantity of limestone, which reduces the CO2 emissions during the decarbonation process, compared with that of Portland cement, the manufacturing of sulfoaluminate cement makes it possible to reduce of almost 35% the carbon dioxide emissions [1]. Knowledge on the properties related to its modified chemical and mineralogical composition are less varied and requires advantage research to better understand of the mechanisms, temperatures and phase transformation stages in these cements
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