Monitoring early age microstructure development of cement paste using bender elements

Jinying Zhu; Seong-Hoon Kee

doi:10.1117/12.848770

8 April 2010 Monitoring early age microstructure development of cement paste using bender elements

Jinying Zhu, Seong-Hoon Kee

Proceedings Volume 7649, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2010; 76491R (2010) https://doi.org/10.1117/12.848770
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2010, San Diego, California, United States

Abstract

Ultrasonic waves have been used to monitor early age microstructure development in cementitious materials. The conventional ultrasonic setups typically measure longitudinal (P) waves in fresh cement pastes and need access two sides of the specimen. This type of setup is not suitable for in-situ field testing. In this study, embedded piezoelectric bender elements were used to generate and measure both P and shear (S) waves in fresh cement pastes. The shear waves were observed at very early age of the cement hydration. The velocities of P and S waves are obtained from B-scan images of a collection of recorded signals over time. Experimental results indicate that the shear wave velocity is closely related to the setting time of cement pastes and less affected by air contents than the P wave velocity. Shear modulus and Poisson's ratios of the cement pates are derived from the measured P and S wave velocities.

Citation Download Citation

Jinying Zhu and Seong-Hoon Kee "Monitoring early age microstructure development of cement paste using bender elements", Proc. SPIE 7649, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2010, 76491R (8 April 2010); https://doi.org/10.1117/12.848770

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