TY - GEN
T1 - Ultrasound frequency analysis for identification of aggregates and cement paste i n concrete specimens
AU - Cosmes-López, Mario F.
AU - Castellanos, Francisco
AU - CanoBarrita, Prisciliano F.De J.
PY - 2014
Y1 - 2014
N2 - The ultrasound putse velocity is based on the time an ultrasonic wave propagates through a concrete specimen andit has generally been employed to verify concrete uniformity, to detect internal defects, and to estimate in-situ concrete strength. lt is known that ultrasound waves collect information about the concrete specimen used as propagation medium. The aim of the present study is to identify aggregates and cement paste during concrete hydration process, by performing Fourier analysis of the ultrasonic response of cylindrical concrete specimens to different excitation frequencies. Thirty-five cylindrical concrete specimens of 10 cm diameter and 20 cm length were cast with concrete. lts water- to-cement ratio was 0.60. The coarse aggregate used was l imestone with a maximum size of 13 mm and the fine aggregate was river sand with a fineness module o f 2.67. After 1 day, the specimens were stripped and moist curedin a saturated time solution at 23 ± 2°C for 28 days. Five specimens were studied at 1, 2, 3, 5, 7, 14 and 28 days using longitudinal and shear ultrasonic waves with frequencies ranging from 50 kHz to 1 MHz. The analysis of the evolution in frequencies observedin the specimens distinguishes variations related to progressive hydration of the cement paste, contrary to the invariant behavior of the inert aggregate.
AB - The ultrasound putse velocity is based on the time an ultrasonic wave propagates through a concrete specimen andit has generally been employed to verify concrete uniformity, to detect internal defects, and to estimate in-situ concrete strength. lt is known that ultrasound waves collect information about the concrete specimen used as propagation medium. The aim of the present study is to identify aggregates and cement paste during concrete hydration process, by performing Fourier analysis of the ultrasonic response of cylindrical concrete specimens to different excitation frequencies. Thirty-five cylindrical concrete specimens of 10 cm diameter and 20 cm length were cast with concrete. lts water- to-cement ratio was 0.60. The coarse aggregate used was l imestone with a maximum size of 13 mm and the fine aggregate was river sand with a fineness module o f 2.67. After 1 day, the specimens were stripped and moist curedin a saturated time solution at 23 ± 2°C for 28 days. Five specimens were studied at 1, 2, 3, 5, 7, 14 and 28 days using longitudinal and shear ultrasonic waves with frequencies ranging from 50 kHz to 1 MHz. The analysis of the evolution in frequencies observedin the specimens distinguishes variations related to progressive hydration of the cement paste, contrary to the invariant behavior of the inert aggregate.
UR - http://www.scopus.com/inward/record.url?scp=85015433567&partnerID=8YFLogxK
M3 - Contribución a la conferencia
AN - SCOPUS:85015433567
T3 - Proceedings of the 10th fib International PhD Symposium in Civil Engineering
SP - 363
EP - 368
BT - Proceedings of the 10th fib International PhD Symposium in Civil Engineering
A2 - Rouleau, Nicolas
A2 - Bastien, Josee
A2 - Fiset, Mathieu
A2 - Thomassin, Mathieu
PB - Universite Laval
T2 - 10th International Federation for Structural Concrete (fib) International PhD Symposium in Civil Engineering 2014
Y2 - 21 July 2014 through 23 July 2014
ER -