Versatility of Piezoelectric Ring Actuator Technique (P-RAT) for Characterization of Cement Paste and Mortar
Piezoelectric ring-actuator technique (P-RAT) enables the measurement of shear wave (S-wave) velocity (Vs) of a cement-based material, which is directly related to its elastic shear modulus (G). The P-RAT can produce high quality signals with low energetic primary waves (P-waves), thus resulting in precise measurements of S-wave velocity. This paper checked the reliability of the P-RAT to monitor the setting time using the frequency spectrum of the received signals. A possibility of using the P-RAT to monitor the elastic shear modulus of the cement pastes and mortars starting at an early age was studied. This paper also discussed signal processing techniques, including phase shift correction and the first arrival time that can be used to determine the variation of Vs of cement paste and mortar, which can be interpreted to determine setting time. In total, 16 cement paste and mortar mixtures proportioned with different water-to-cement ratios (w/c), high-range water-reducing admixture dosages, and sand volume fractions were investigated. In addition to Vs measurements, the frequency content of the received signals was shown to offer another alternative to determine setting time of cement paste and mortar. To monitor the elastic shear modulus of cement paste and mortar from 1 up to 56 days, a test setup with two P-RAT sensors mounted on opposite sides of a clamping vice was developed for measuring Vs of different hardened material in shape and thickness.
S. Naji et al., "Versatility of Piezoelectric Ring Actuator Technique (P-RAT) for Characterization of Cement Paste and Mortar," Advances in Civil Engineering Materials, vol. 6, no. 1, pp. 189-212, ASTM International, Apr 2017.
The definitive version is available at https://doi.org/10.1520/ACEM20160039
Civil, Architectural and Environmental Engineering
Keywords and Phrases
Actuators; Cements; Characterization; Elastic moduli; Mortar; Piezoelectricity; Rats; Seismic waves; Setting; Shear strain; Shear waves; Signal processing; Wave propagation; Cement based material; Cement paste; Elastic shear modulus; High range water reducing admixtures; Piezoelectric rings; Precise measurements; Setting time; Signal processing technique; Shear flow; Cement paste and mortar; Piezoelectric ring-actuator technique (P-RAT)
International Standard Serial Number (ISSN)
Article - Journal
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01 Apr 2017