Determining the concrete stiffness matrix through ultrasonic testing

Engenharia Agrícola

Raquel Gonçalves²  Milton Giacon Júnior¹  Igor M. Lopes¹ 

[1] ,Universidade Estadual de Faculdade de Engenharia Agrícola Laboratório de Ensaios Não DestrutivosCampinas SP

关键词: compressive strength;    modulus of deformation;    mechanical properties;    resistência à compressão;    módulo de deformação;    propriedades mecânicas;   

DOI  :  10.1590/S0100-69162011000300003

来源: SciELO

【 摘 要 】

The determination of the modulus tangent (Eci ) and of the modulus secant (Ecs) of the concrete can be done using compression test but, to be simpler, it is used relations with characteristic strength (f ck). Relations are also used to determine the transversal modulus (Gc) and, in the case of the Poisson's ratio (ν), a fixed value 0.20 is established. The objective of this research was to evaluate the use of the ultrasonic propagation waves to determine these properties. For the tests were used specimens with f ck varying from 10 to 35 MPa. For the ultrasonic tests were used cylindrical and cubic specimens. The modulus of deformation obtained by ultrasound was statistically equivalent to the obtained by compression tests. The results of modules obtained using the relations with f ck was far away from those obtained by ultrasound or by compression tests. The Poisson's ratio obtained by ultrasound was superior to the fixed value. We can conclude that the concrete characterization by ultrasound is consistent and, to this characterization the cylindrical specimen, normally used to determine f ck, can be used.

【 授权许可】

CC BY   
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