Resumo

QUINTERO ORTIZ, LUZ AMPARO; HERRERA, JULIAN; CORZO, LAURA  e  GARCIA, JOHANA. RELATIONSHIP BETWEEN COMPRESSIVE STRENGTH AND POROSITY OF CONCRETE EVALUATED FROM ULTRASONIC PARAMETERS. Rev. ion [online]. 2011, vol.24, n.1, pp.69-76. ISSN 0120-100X.

The purpose of this research was to evaluate the compressive strength and porosity of concrete samples using ultrasonic pulse velocity (UPV) measurements and then establish relationships between the studied properties and the UPV. The samples were prepared with different water/cement ratios (w/c) and cured for 28 days at indoor environmental conditions. This work was raised taking into account that porosity is an important factor that influences the material, allowing aggressive agents to enter the concrete matrix affecting its compressive strength, and in general decreasing the projected lifetime of the structure. Previous studies have proved that porosity strongly depends on the water/cement ratio (w/c) used for the mixture. One method to evaluate structures without affecting them is ultrasounds. Through this technique, mechanical resistance can be estimated both in situ and in laboratory. The ultrasonic technique that is widely used is the ultrasonic pulse velocity (UPV). In this paper the compressive strength, the porosity, and the ultrasonic pulse velocity were measured in concrete test tubes manufactured with Portland cement type I, using water/cement ratios of 0.45, 0.50, 0.55, and 0.60. The experiments were carried out at 7, 14 y 28 curing days. This first work about UPV technique application as a non-destructive testing for assessing concrete quality, allowed studying the potential of technique itself, as a means to estimate the material behavior, in this case during the curing stage under environment conditions.

Palavras-chave : nondestructive testing; ultrasonic pulse velocity; durability.

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