Noncontact inspection of the curing process of cementitious materials by laser Doppler vibrometry

I. K. Tragazikis; T. Z. Kordatou; A. N. Koutrakou; D. A. Exarchos; Panagiota Aikaterini T. Dalla; T. E. Matikas

doi:10.1117/12.2558050

23 April 2020 Noncontact inspection of the curing process of cementitious materials by laser Doppler vibrometry

I. K. Tragazikis, T. Z. Kordatou, A. N. Koutrakou, D. A. Exarchos, Panagiota Aikaterini T. Dalla, T. E. Matikas

Proceedings Volume 11379, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2020; 1137924 (2020) https://doi.org/10.1117/12.2558050
Event: SPIE Smart Structures + Nondestructive Evaluation, 2020, Online Only

Abstract

An essential issue in materials research, quality control, and in practical planning and implementation of construction projects, is the understanding of the curing process of fresh cement-based materials. Immediately after mixing, cementitious materials exhibit a significant damping effect on ultrasonic wave propagation together with low pulse velocity. During the curing process, ultrasonic waves, especially the nonlinear acoustic behavior of the material, are sensitive to the point at which the solid phase appears. After this point, the ultrasonic pulse velocities and signal amplitudes increase continuously. The point of solidification is of practical significance since the connectivity of the solid phase is responsible for the load-bearing capacity of the cement composite and its long-term behavior. The aim of this study is to monitor the early stages of fresh cement-paste composites during the hydration process using nonlinear elastic waves. The measurements in this work were performed using a combination of contact ultrasonic transducer and noncontact optical detection measurement device. The principle of operation of the detection device is based on the doppler effect. Using this technique, the amplitudes of harmonic vibrations of an elastic wave with a fundamental frequency propagating through the material can be assessed. This leads to the evaluation of important materials characteristics, such as the changes in internal microstructure of fresh concrete during curing, the evolution of higher order elastic contants of the material expressed in the form of nonlinear parameters, as well as the longitudinal wave velocity.

Citation Download Citation

I. K. Tragazikis, T. Z. Kordatou, A. N. Koutrakou, D. A. Exarchos, Panagiota Aikaterini T. Dalla, and T. E. Matikas "Noncontact inspection of the curing process of cementitious materials by laser Doppler vibrometry", Proc. SPIE 11379, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2020, 1137924 (23 April 2020); https://doi.org/10.1117/12.2558050

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available