TY - GEN
T1 - A nonlinear wave mixing method for detecting Alkali-Silica reactivity of aggregates
AU - Liu, M.
AU - Tang, G.
AU - Jacobs, L. J.
AU - Qu, J.
PY - 2012
Y1 - 2012
N2 - Alkali-silica reaction (ASR) is a deleterious reaction in concrete. Significant ASR damage could undermine the durability of concrete structures and may result in reduced service life. Several nondestructive techniques based on ultrasound have been used to assess ASR damage. It has been shown that nonlinear ultrasound is more sensitive to internal stresses as well as to micro-cracks induced by ASR damage. In this investigation, we developed a co-linear wave mixing method for assessing ASR damage in concrete. By mixing two longitudinal waves, a new longitudinal wave with a lower frequency is generated. The amplitude of this new wave is proportional to the acoustic nonlinear parameter β which can then be obtained from the frequency spectrum of the newly generated longitudinal wave. Our experimental results show that (i) the acoustic nonlinearity parameter is closely correlated to ASR damage in concrete, (ii) the nonlinear wave mixing technique developed here is capable of measuring the changes in the acoustic nonlinearity parameter caused by ASR damage, even in its early stages, and (iii) the nonlinear wave mixing method has the potential to identify the different stages of ASR damage and to track the intrinsic characteristics of the ASR damage.
AB - Alkali-silica reaction (ASR) is a deleterious reaction in concrete. Significant ASR damage could undermine the durability of concrete structures and may result in reduced service life. Several nondestructive techniques based on ultrasound have been used to assess ASR damage. It has been shown that nonlinear ultrasound is more sensitive to internal stresses as well as to micro-cracks induced by ASR damage. In this investigation, we developed a co-linear wave mixing method for assessing ASR damage in concrete. By mixing two longitudinal waves, a new longitudinal wave with a lower frequency is generated. The amplitude of this new wave is proportional to the acoustic nonlinear parameter β which can then be obtained from the frequency spectrum of the newly generated longitudinal wave. Our experimental results show that (i) the acoustic nonlinearity parameter is closely correlated to ASR damage in concrete, (ii) the nonlinear wave mixing technique developed here is capable of measuring the changes in the acoustic nonlinearity parameter caused by ASR damage, even in its early stages, and (iii) the nonlinear wave mixing method has the potential to identify the different stages of ASR damage and to track the intrinsic characteristics of the ASR damage.
KW - Alkali-Silica Reaction
KW - Mixing Waves
KW - Nonlinear Ultrasound
UR - http://www.scopus.com/inward/record.url?scp=84863611027&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84863611027&partnerID=8YFLogxK
U2 - 10.1063/1.4716396
DO - 10.1063/1.4716396
M3 - Conference contribution
AN - SCOPUS:84863611027
SN - 9780735410138
T3 - AIP Conference Proceedings
SP - 1524
EP - 1531
BT - Review of Progress in Quantitative Nondestructive Evaluation
T2 - 38th Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE
Y2 - 17 July 2011 through 22 July 2011
ER -