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Performance of Concrete in Precast Products due to Heat Curing

AutorGarcía Calvo, José Luis; Robles Velasco, M.; Alonso, C.; Fernández Luco, Luis
Palabras clavePrecast concrete
Heat curing
Durability properties
Fecha de publicación2011
ResumenHeat curing processes are often used to ensure the production rate in industrial plants that fabricate precast concrete structures like Uniblok-Ormazabal. Heat curing may influence both the microstructural properties and the durability parameters of the reinforced concrete; thus, it is necessary to take into account these influences in the design of the concrete when a given performance has to be achieved. This paper deals with the evaluation of the influence of the heat curing process on several concrete parameters. Four different types of samples, made of identical concrete composition, have been evaluated: - Concrete directly cast at the plant and stored in standard curing conditions. - Concrete made in the laboratory and stored in standard curing conditions. - Concretes cores extracted from a precast structure made in plant, after the heat curing process. - Concrete made in the laboratory, submitted to a heat curing process that reproduced the one carried out in the plant. The parameters evaluated in the four sample types were: mechanical properties, porosity, capillary suction coefficient, microstructure (using Back Scattered Electron Microscopy), and resistance against carbonation and against chloride penetration. The obtained results show that the heat curing process can be well reproduced in a laboratory scale giving a concrete with the same properties than those obtained in the concrete fabricated in the plant production rate. Regarding the results obtained in the concrete properties evaluated, first of all it must be said that the concrete mix studied showed a very good performance, exceeding the requirements defined for this type of concrete. Moreover, when comparing the obtained results with several durability indicators found in the literature, the concrete mix studied can be defined as a high durability material. With regard to the influence of the heat curing on the concrete properties, it can be said that this process modifies the properties of the material and decreases the quality as compared to the concrete cured in standard conditions. However, once these changes are quantified, they can be compensated for in the mix design process and the resulting product can be compliant with the performance-based specifications.
Aparece en las colecciones: (IETCC) Comunicaciones congresos
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