Abstract
The hydration, strength development and composition of hydration products of supersulphated cements were characterized from the first 48 hours up to 360 days. Two compositions of 80% Blast furnace slag, 10–15% Fluorgypsum and 10–5% Portland cement were cured in dry and wet conditions. The main hydration products were ettringite and C-S-H since the first hours and up to 360 days as evidenced by X-ray diffraction, thermal analysis and electron microscopy. The strength was favored by higher fluorgypsum contents and lower Portland cement contents. These cements generated heats of hydration of 40–57 KJ/Kg after 28 hours, which are lower than portland cement.
Highlights
Concrete as a construction material is environmentally more convenient than other construction materials like plastics, glass, steel and aluminum, the industry is interested in causing the least possible environment impact throughout the reuse of wastes as aggregates or in binders.The study and development of cementitious materials alternative to portland cement (PC) has been of interest to reduce the environmental impact caused by the production of the latter; one route is the use of inorganic industrial wastes as partial or full replacement of PC
Calorimetric studies have been a useful tool to understand the hydration reactions by following the heat liberation rate (HLR) of the reacting PC [15], the technique can be applied to other cementitious materials [16, 17]
Peak 0 is attributed to the wetting and the beginning of the hydration reactions, the higher and wider peak 0 from the supersulphated cements (SC) 80-15-5 would originate from the reaction of a higher proportion of fluorgypsum and
Summary
Concrete as a construction material is environmentally more convenient than other construction materials like plastics, glass, steel and aluminum, the industry is interested in causing the least possible environment impact throughout the reuse of wastes as aggregates or in binders. Mechanical activation is attained by increasing its surface area; on the other hand, chemical activation is possible by means of several reagents, mainly alkalis, sulfates, PC, etc., resulting in cements of strength and durability sometimes higher than those of PC This makes the BFS an excellent alternative cementitious material for mortar and concrete applications. Bijen and Niël [10] reported on mortars and concretes cured for up to 56 days, using a commercial SC and laboratory formulations made with several slags at 79–83%, 2–7% clinker and 14–15% of calcium sulphates (phosphogypsum or fluorgypsum). As part of a wider outset, this work presents the results of an investigation on the early hydration, strength development, evolution of hydration products and microstructural aspects in supersulphated cements cured for up to 360 days, using fluorgypsum and PC as the activators. And late hydration of supersulphated cements of blast furnace slag with fluorgypsum 3
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