Abstract:
Fines from cementitious wastes, when dry at temperature lower than 600°C, can potentially exhibit binding properties without emitting the CO2 from limestone decarbonation. This research assessed the reactivity and the mechanical strength of slag cement paste and the cement produced using the ground dehydrated (T=500°C) original paste. Physical characteristics of materials such as particle size distributions, and BET specific surface area were determined. Reactivity was assessed by isothermal calorimetry. SEM images were taken for microstructure analysis and the mechanical strength was determined on paste specimens. Results showed that the dehydrated cement mixed with water behaved like an OPC paste. The dehydrated cement paste showed a 28-days compressive strength around 68% of the original cement paste. The calorimetry showed high heat values during the initial period. This might be due to the binding of water with the dehydrated structures and the formation of similar hydrated products, such as silicates, silico aluminates and sulphoaluminates.
Reference:
BALDUSCO, Raphael; NOBRE, Tiago R. Santos; ÂNGULO, Sérgio Cirelli; QUARCIONI, Valdecir Angelo. Reatividade e resistência mecânica de pastas reidratadas de cimento de alto forno. In: ENCONTRO NACIONAL SOBRE APROVEITAMENTO DE RESÍDUOS NA CONSTRUÇÃO, 5., 2017, Fortaleza. Anais…
Fines from cementitious wastes, when dry at temperature lower than 600°C, can potentially exhibit binding properties without emitting the CO2 from limestone decarbonation. This research assessed the reactivity and the mechanical strength of slag cement paste and the cement produced using the ground dehydrated (T=500°C) original paste. Physical characteristics of materials such as particle size distributions, and BET specific surface area were determined. Reactivity was assessed by isothermal calorimetry. SEM images were taken for microstructure analysis and the mechanical strength was determined on paste specimens. Results showed that the dehydrated cement mixed with water behaved like an OPC paste. The dehydrated cement paste showed a 28-days compressive strength around 68% of the original cement paste. The calorimetry showed high heat values during the initial period. This might be due to the binding of water with the dehydrated structures and the formation of similar hydrated products, such as silicates, silico aluminates and sulphoaluminates.
Reference:
BALDUSCO, Raphael; NOBRE, Tiago R. Santos; ÂNGULO, Sérgio Cirelli; QUARCIONI, Valdecir Angelo. Reatividade e resistência mecânica de pastas reidratadas de cimento de alto forno. In: ENCONTRO NACIONAL SOBRE APROVEITAMENTO DE RESÍDUOS NA CONSTRUÇÃO, 5., 2017, Fortaleza. Anais…
