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Influence of limestone addition on calcium leaching mechanisms in cement-based materials
In order to investigate the mechanisms of calcium leaching and their implications on the long-term durability of cement-based materials, four different systems (C3S, C3S+C3A+CaSO4 dot 2H2 O, C3S+C4AF+CaSO4 dot 2H2O, and Portland cement) were prepared, mixed with water, and cured for several weeks. Four percentages of calcium carbonate addition (0%, 5%, 10%, and 20%) were used in the preparation of these systems. In all cases, the water/solid ratio was fixed at 0.5. At the end of the curing period, 1-mm thick samples were cut and immersed in distilled water. The kinetics of degradation was assessed by thermogravimetric analysis (TGA) and X-ray diffraction (XRD) analysis after 10, 20, 40, and 90 days of immersion. The volumetric stability was also followed by length-change measurements. Test results clearly indicate that the mechanisms of leaching are directly affected by the mineralogical composition of the system, in particular by the calcium carbonate content.
Influence of limestone addition on calcium leaching mechanisms in cement-based materials
In order to investigate the mechanisms of calcium leaching and their implications on the long-term durability of cement-based materials, four different systems (C3S, C3S+C3A+CaSO4 dot 2H2 O, C3S+C4AF+CaSO4 dot 2H2O, and Portland cement) were prepared, mixed with water, and cured for several weeks. Four percentages of calcium carbonate addition (0%, 5%, 10%, and 20%) were used in the preparation of these systems. In all cases, the water/solid ratio was fixed at 0.5. At the end of the curing period, 1-mm thick samples were cut and immersed in distilled water. The kinetics of degradation was assessed by thermogravimetric analysis (TGA) and X-ray diffraction (XRD) analysis after 10, 20, 40, and 90 days of immersion. The volumetric stability was also followed by length-change measurements. Test results clearly indicate that the mechanisms of leaching are directly affected by the mineralogical composition of the system, in particular by the calcium carbonate content.
Influence of limestone addition on calcium leaching mechanisms in cement-based materials
Catinaud, S. (author) / Beaudoin, J.J. (author) / Marchand, J. (author)
Cement and Concrete Research ; 30 ; 1961-1968
2000
8 Seiten, 16 Quellen
Article (Journal)
English
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