Correlation between concrete strength properties and surface electrical resistivity

Abstract

Periodic inspections in reinforced concrete structures are important to be carried out to assess their state of conservation. In this scenario, non-destructive tests can be a suitable option since destructive tests are invasive and may be difficult to be performed in some cases. Considering this option, correlations between non-destructive test parameters and the concrete properties to be analyzed are useful tools that make easier the structure inspection. In the present work, correlations between the compressive strength (fc) and splitting tensile strength (ft) and surface electrical resistivity (ρ) of concretes were studied. Brazilian concretes of six different mixtures were analyzed at five different ages and correlation curves between strength properties and surface electrical resistivity of concrete were obtained, which are represented by the general relationships fc= 14.18·ln(ρ) + 18.43 and ft = 0.69·ln(ρ) + 2.15 for compressive strength and splitting tensile strength, respectively. In addition, a general curve considering literature data and results from this work was proposed to represent the relationship between compressive strength and surface electrical resistivity - fc = 11.89·ln(ρ) + 18.90.

Evaluation of the compressive strength of a reinforced concrete structure using different SonReb estimation methods

“…Concrete is a material that is made up of cement, coarse and fine aggregates, water and additives, and once it sets it is necessary to know the acquired compressive strength value, mainly at 28 days. For this purpose, numerous calculation equations have been developed that allow estimating the concrete's fc from the values of the Rebound Hammer (RN) (Lima and Silva, 2000), the ultrasonic pulse velocity (UPV) (Hannachi and Guetteche, 2012); (Popovics, 1991) or the measurement of the resistivity (ρ) of the concrete (Araújo and Meira, 2021).…”

Evaluación de modelos SonReb para la estimación de la resistencia a compresión en hormigones de cemento y áridos cubanos

“…Concrete is a material that is made up of cement, fine and coarse aggregates, water and additives, and once it sets it is necessary to know the resistance value acquired, mainly after 28 days. For this purpose, numerous calculation equations have been developed that allow estimating the concrete's fc from the values of the Rebound Hammer (RN) (Lima and Silva, 2000), ultrasonic pulse velocity (UPV) (Hannachi andGuetteche, 2012, Popovics, 1991) or the measurement of the apparent resistivity (ρ) of the concrete (Araújo and Meira, 2021).…”