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Environments 2017, 4(3), 64; https://doi.org/10.3390/environments4030064

Calcium Sulfoaluminate, Geopolymeric, and Cementitious Mortars for Structural Applications

1
Department of Materials, Environmental Sciences and Urban Planning, Università Politecnica delle Marche, via Brecce Bianche 12, Ancona 60131, Italy
2
School of Engineering, Università degli Studi della Basilicata, Viale dell’Ateneo Lucano 10, Potenza 85100, Italy
3
Institute of Atmospheric Sciences and Climate, National Research Council (ISAC-CNR), Via Gobetti 101, Bologna 40129, Italy
*
Author to whom correspondence should be addressed.
Received: 27 July 2017 / Revised: 11 September 2017 / Accepted: 14 September 2017 / Published: 16 September 2017
(This article belongs to the Special Issue Environmentally Friendly Geopolymer Composites)
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Abstract

This paper deals with the study of calcium sulfoaluminate (CSA) and geopolymeric (GEO) binders as alternatives to ordinary Portland cement (OPC) for the production of more environmentally-friendly construction materials. For this reason, three types of mortar with the same mechanical strength class (R3 ≥ 25 MPa, according to EN 1504-3) were tested and compared; they were based on CSA cement, an alkaline activated coal fly ash, and OPC. Firstly, binder pastes were prepared and their hydration was studied by means of X-ray diffraction (XRD) and differential thermal-thermogravimetric (DT-TG) analyses. Afterwards, mortars were compared in terms of workability, dynamic modulus of elasticity, adhesion to red clay bricks, free and restrained drying shrinkage, water vapor permeability, capillary water absorption, and resistance to sulfate attack. DT-TG and XRD analyses evidenced the main reactive phases of the investigated binders involved in the hydration reactions. Moreover, the sulfoaluminate mortar showed the smallest free shrinkage and the highest restrained shrinkage, mainly due to its high dynamic modulus of elasticity. The pore size distribution of geopolymeric mortar was responsible for the lowest capillary water absorption at short times and for the highest permeability to water vapor and the greatest resistance to sulfate attack. View Full-Text
Keywords: calcium sulfoaluminate cement; durability; geopolymer; hydration; mechanical strength; microstructure; mortar; portland cement calcium sulfoaluminate cement; durability; geopolymer; hydration; mechanical strength; microstructure; mortar; portland cement
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Mobili, A.; Belli, A.; Giosuè, C.; Telesca, A.; Marroccoli, M.; Tittarelli, F. Calcium Sulfoaluminate, Geopolymeric, and Cementitious Mortars for Structural Applications. Environments 2017, 4, 64.

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