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Showing 1 to 5 of 5 for “"Ultrasonic wave reflection"”.
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Ultrasonic wave reflection measurements on self-compacting pastes and concretes
… to extend the use of combined longitudinal (P-wave) and shear (S-wave) ultrasonic wave reflection (UWR) to monitor the setting and stiffening of self-compacting pastes and concretes. An additional objective was to interpret the UWR responses of various modified cement pastes. A polymeric buffer …
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Ultrasonic wave reflection measurements on stiffening and setting of cement paste
… of this research is to extend the use of P-wave and S-wave ultrasonic wave reflection (UWR) to monitor stiffening and setting of portland cement paste. The research focuses especially on the very early hydration period, during the first hours after mixing. For such purpose, it is necessary …
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Understanding the role of slag on geopolymer hardening and microstructural development
… = 5.1. For the first time in this study, ultrasonic wave reflection method along with Proctor penetration were used to determine the stiffening rate of geopolymers and their results correlated well. Microstructural development was investigated using SEM/EDS while the reaction rate was …
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Prospective retarders for alkali-activated slag: stability at high alkalinity, effects on setting behavior and strength of paste
… measurements through UV-Vis-NIR spectroscopy and ultrasonic wave reflection (for hardening) were performed, but quality data was hard to obtain. The results from these tests are not part of the main investigation and have been presented separately in the Appendix. Most conventional organic …
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Understanding the role of calcium on the reaction mechanism of geopolymer cements through addition of nucleation seeds
… calorimetry, scanning electron microscopy, shear wave ultrasonic wave reflection method, and Fourier Transform Infrared spectroscopy are employed to study the effects of seed on reaction kinetics, extent of product formation, nature of reaction products, and dissolution of raw materials. Through …