Mechanical properties of old concrete using destructive and ultrasonic non-destructive testing methods

Abstract

This paper examines the variation in properties of a specific type of 28-year-old concrete, the characteristics of which were known at 7, 28, 36 and 90 days. Beyond the destructive tests (compression, splitting tension and bending), the concrete was studied with non-destructive ultrasound testing. Moreover, the relationship between the compressive strength of this concrete and the ultrasonic longitudinal wave velocity, as well as the dynamic modulus of elasticity were determined. The objective was to control changes in the quality of concrete over a long period of time and to contribute to the development of a non-destructive method for the determination of concrete strength in structures. The presented approach, that seems promising for such development, uses the velocity of ultrasonic waves in concrete.

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Experimental assessment of functionally graded reinforced concrete (FGRC) slabs under drop weight and projectile impacts

“…Various researchers have investigated the relationships between mechanical properties (modulus of elasticity, compressive strength, etc.) and pulse velocity [10][11][12][13][14][15]. UPV test has been implemented with PUNDIT7, an ultrasonic non-destructive integrity-testing machine, on three cubic specimens with dimensions of 100 Â 100 Â 100 mm to determine effects of fibers on mechanical properties, such as tensile and compression strengths.…”

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