Title :

Relationship between ultrasonic Rayleigh wave propagation and capillary porosity in cement paste with variable water content

Author(s) :

Soltani, Fethi [Auteur]
Laboratoire de Mécanique de Lille - FRE 3723 [LML]
Goueygou, Marc [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Lafhaj, Zoubeir [Auteur]
Laboratoire de Mécanique de Lille - FRE 3723 [LML]
Piwakowski, Bogdan [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]

Journal title :

NDT & E International

Pages :

75-83

Publisher :

Elsevier

Publication date :

2013

ISSN :

0963-8695

English keyword(s) :

Ultrasonic testing
Cement
Porosity
Water saturation
Rayleigh wave

English abstract : [en]

The relationship between Rayleigh wave velocity at ultrasonic frequencies and capillary porosity is investigated in dry and water saturated cement paste. Capillary porosity is varied by changing the water/cement (w/c) ...
Show more >The relationship between Rayleigh wave velocity at ultrasonic frequencies and capillary porosity is investigated in dry and water saturated cement paste. Capillary porosity is varied by changing the water/cement (w/c) ratio. Water saturation is set at four levels - 100, 70, 30 and 0% - by drying the fully saturated specimen. Rayleigh wave (RW) wavefront and phase velocities are measured using air-coupled ultrasonic transducers as transmitter and receiver. The measurement accuracy is evaluated using a reference specimen made up of a non-dispersive material. As expected, a linear decrease of RW velocity vs. porosity is observed for the intermediate saturation states, but not for the fully and dry states, possibly due to micro-cracks induced during the drying phase and to the presence of bubbles in the specimens with low w/c ratio. The comparison of phase velocity in specimens with low and high w/c ratio shows an inversion of the porosity gradient perpendicular to the surface of measurements, which is due to segregation of cement at high w/c ratio. Finally, the correlation between RW velocity and capillary porosity is analyzed and compared with results obtained in mortar.Show less >

Language :

Anglais

Popular science :

Non

Collections :

• Institut d'Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520

Source :

Harvested from HAL