Comparison between Nondestructive Methods for Concrete Strength
Ibrahim A.E. Shehata, Ana Catarina Evangelista, Lídia C. D. Shehata, UFRJ, Rio de Janeiro, RJ, Brasil
ABSTRACT This work presents a comparison made between different non-destructive test methods for evaluating of the concrete strength in existing structures. The used techniques were: the ultrasonic pulse velocity, the pin penetration, the pulloff and the rebound hammer. All test were carried out on blocks, that were cast in the laboratory with either normal or lightweight concrete, at following ages: 3, 7, 28, 90 and 120 day. Three normal aggregate concrete mixes were made with different coarse aggregate maximum sizes. Two lightweight concrete mixes were made varying the maximum size of coarse aggregate (expanded clay). To evaluate this method for high strength concrete was added in the mixes silica fume and superplasticizer. From the obtained test results, correlation curves are draw for all methods and for the different mixes. The applicability of the used methods is also discussed.
Publication Source: NDTISS '99 - International Symposium on NDT Contribution to the Infrastructure Safety Systems, Nov 1999 in Tores Brazil.
Publisher: Center of Tecnology, Federal University of Santa Maria (UFSM) - [Homepage]
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