Fisuras de contracción en pavimentos de hormigón y el aserrado de juntas
Abstract
RESUMEN
Los cambios volumétricos por variaciones de temperatura y contenido de humedad en el hormigón endurecido de los pavimentos, que por sus restricciones impiden su deformación, causan tensiones de tracción, provocando fisuras aleatorias. La presencia de fisuras de contracción en los pavimentos de hormigón, reducen su vida útil y generan costos de mantenimiento importantes. Es necesario definir a priori la ubicación de las fisuras aserrando el pavimento. Las zonas aserradas crean planos de debilidad donde se forman las fisuras, siendo crÃtico el momento oportuno para realizar el aserrado de las juntas de contracción en los pavimentos. El perÃodo óptimo para efectuar el aserrado se denomina ventana de aserrado. El objetivo de este trabajo es (poner objetivo). Entre los resultados obtenidos se puede decir que (dar resultados). Los estudios son parte de un Proyecto de I+D.
Palabras Clave: contracción; hormigón; pavimentos; juntas; fisuras.
ABSTRACT
In the hardened concrete of pavements, with limited deformation, volumetric changes due to variations in temperature and humidity cause tensile stresses, with subsequent cracks random. The presence of shrinkage cracks in concrete pavements, reduces its service life and generates substantial maintenance costs. It is necessary to define a priori the location of cracks, by sawing the pavement. Sawn areas create planes of weakness where cracks form, being critical the right time to saw the contraction joints in pavements. The optimal time to perform the sawing is called sawing window. In this paper the first results about concrete pavements are recorded, establishing sawing times, comparing cylindrical compressive strength, maturity of concrete and ultrasonic pulse values. The studies are part of a R & D project.
Keywords: contraction; concrete; pavements; joints; cracks.
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References
ACI 325.11R-01 (2001),“Accelerated Techniques for Concrete Pavingâ€.
ACPA, TB016.01P (2002), “Early Cracking of Concrete Pavements – Causes and Repairsâ€, Skokie, Illinois.
ASTM C 1074 (1998), “Standard Practice for Estimating Concrete Strength by the Maturity Methodâ€.
Dirección Nacional de Vialidad (1998), “Pliego de Especificaciones Técnicas Generalesâ€.
Fava A., Zuker J. (1971), “Técnicas y Equipos Actuales para el Aserrado de Juntas en los Pavimentos de Hormigónâ€, VI Simposio del Equipo Vial, Dirección de Vialidad de la Provincia de Buenos Aires, Publicación Nº 95: pp. 117 –140.
IRAM 1683 (1990), “Hormigón de Cemento Portland, Método para Determinar la Velocidad de Pulsos Ultrasónicosâ€.
Taylor P., et al (2007), “Integrated Materials and Construction Practices for Concrete Pavement: a State-of-the-Practice Manualâ€, FHWA Publication No. HIF - 07 – 004.
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