title: Study of stress-induced velocity variation in concrete under direct tensile force and monitoring of the damage level by using thermally-compensated Coda Wave Interferometry.
abstract: In this paper, we describe an experimental study of concrete behavior under a uniaxial tensile load by use of the thermally-compensated Coda Wave Interferometry (CWI) analysis. Under laboratory conditions, uniaxial tensile load cycles are imposed on a cylindrical concrete specimen, with continuous ultrasonic measurements being recorded within the scope of bias control protocols. A thermally-compensated CWI analysis of multiple scattering waves is performed in order to evaluate the stress-induced velocity variation. Concrete behavior under a tensile load can then be studied, along with CWI results from both its elastic performance (acoustoelasticity) and plastic performance (microcracking corresponding to the Kaiser effect). This work program includes a creep test with a sustained, high tensile load; the acoustoelastic coefficients are estimated before and after conducting the creep test and then used to demonstrate the effect of creep load.
authors.affiliation: LUNAM Université, IFSTTAR, MACS, CS4, F-44344 Bouguenais Cedex, France. yuxiang.zhang@ifsttar.fr
authors.forename: Yuxiang
authors.initials: Y
authors.lastname: Zhang
authors.forename: Odile
authors.initials: O
authors.lastname: Abraham
authors.forename: Frédéric
authors.initials: F
authors.lastname: Grondin
authors.forename: Ahmed
authors.initials: A
authors.lastname: Loukili
authors.forename: Vincent
authors.initials: V
authors.lastname: Tournat
authors.forename: Alain
authors.initials: A
authors.lastname: Le Duff
authors.forename: Bertrand
authors.initials: B
authors.lastname: Lascoup
authors.forename: Olivier
authors.initials: O
authors.lastname: Durand