2026-04-13T04:50:51Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/900362026-01-14T05:52:06Zcom_2072_1033col_2072_452950

00925njm 22002777a 4500 dc Salvador, Renan author Pialarissi Cavalaro, Sergio Henrique author Cincotto, Maria Alba author Domingues de Figueiredo, Antonio author 2016-11 The objective of this work is to parametrize the early age hydration behavior of accelerated cement pastes based on the chemical properties of cement and accelerators. Eight cements, three alkali-free and one alkaline accelerators were evaluated. Isothermal calorimetry, in situ XRD and SEM imaging were performed to characterize kinetics and mechanisms of hydration and the microstructure development. The reactivity of all accelerators is directly proportional to their aluminum and sulfate concentrations and to the amount and solubility of the setting regulator contained in cement. Alite hydration is enhanced if a proper C3A/SO3 ratio (between 0.67 and 0.90) remains after accelerator addition and if limestone filler is employed, because undersulfated C3A reactions are avoided. Combinations of compatible materials are recommended to enhance the performance of the matrix and to prevent an undesirable hydration behavior and its consequences in mechanical strength development. Peer Reviewed Postprint (author's final draft) Àrees temàtiques de la UPC::Enginyeria civil::Materials i estructures::Materials i estructures de formigó Shotcrete Cement paste Accelerator Hydration Kinetics Sprayed concrete Formigó gunitat Parameters controlling early age hydration of cement pastes containing accelerators for sprayed concrete