Dispersion and optimization of a calcium sulfoaluminate mortar prepared with superplasticizer
Abstract
Calcium sulfoaluminate (CSA) cements/mortars are receiving increasing attention since their manufacture produces less CO2 than ordinary Portland cement (OPC) (up to 22% of decrease depending on its composition). These systems are complex and there are many parameters affecting their hydration mechanism, such as water-to-cement (w/c) ratio, type and amount of sulfate source, and so on. Low w/c ratios, within certain limits, may reduce the porosity and consequently, improve the mechanical strengths. However, it is accompanied by an increasing of viscosity and lack of both workability and homogeneity, with the consequent negative effect on the mechanical properties. The dispersion of the particles through the adsorption of the right amount and type of additives, such as superplasticizers, is a key point to improve the workability of mortars allowing both the preparation of homogeneous mixtures and the reduction of the amount of mixing water. This work deals with the preparation and optimization of homogeneous CSA-mortars with improved mechanical strengths. The optimum amount of superplasticizer was optimized through rheological measurements. The effect of different amounts of the superplasticizer on the viscosity of the mortars, its hydration mechanism and corresponding mechanical properties has been studied and will be discussed.
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1 LIBRO DE COMUNICACIONES 17ª REUNION CIENTÍFICA PLENARIA DE QUÍMICA INORGÁNICA 11ª REUNIÓN CIENTÍFICA PLENARIA DE QUÍMICA DEL ESTADO SÓLIDO Torremolinos (Málaga) 19 - 22 Junio 2016
2 Reunión Cientifica y Plenaria de Química Inorgánica y Estado Sólido Torremolinos (Málaga), 2016 Libro Resumen de Comunicaciones (Abstracts) / QIES16, 17ª Reunión Científica Plenaria De Química Inorgánica y 11ª Reunión Científica Plenaria De Química Del Estado Sólido de la RSEQ, en Torremolinos (Málaga) del 19 al 22 de junio de 2016. EDITA Enrique Rodríguez Castellón, Universidad de Málaga Mercedes Moreno Recio, Universidad de Málaga DISEÑO: Rocío Rodríguez Aguado ISBN 978-84-608-9065-2
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113 Dispersion and optimization of a calcium sulfoaluminate mortar prepared with superplasticizer D. Canto-González, J.D. Zea-García, A.G. De la Torre, I. Santacruz*. Departamento de Química Inorgánica, Cristalografía y Mineralogía, Universidad de Málaga, 29071 Málaga-Spain. *[email protected] Calcium sulfoaluminate (CSA) cements/mortars are receiving increasing attention since their manufacture produces less CO2 than ordinary Portland cement (OPC) (up to 22% of decrease depending on its composition). These systems are complex and there are many parameters affecting their hydration mechanism, such as water-to-cement (w/c) ratio, type and amount of sulfate source, and so on. Low w/c ratios, within certain limits, may reduce the porosity and consequently, improve the mechanical strengths. However, it is accompanied by an increasing of viscosity and lack of both workability and homogeneity, with the consequent negative effect on the mechanical properties. The dispersion of the particles through the adsorption of the right amount and type of additives, such as superplasticizers, is a key point to improve the workability of mortars allowing both the preparation of homogeneous mixtures and the reduction of the amount of mixing water. This work deals with the preparation and optimization of homogeneous CSA-mortars with improved mechanical strengths. The optimum amount of superplasticizer was optimized through rheological measurements. The effect of different amounts of the superplasticizer on the viscosity of the mortars, its hydration mechanism and corresponding mechanical properties has been studied and will be discussed. P45
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