Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Effects of experimental parameters in monitoring the hydration of cement mortars by ultrasonic testing
Date
2012-12-01
Author
Keskin, Ö. Kasap
Yaman, İsmail Özgür
Tokyay, Mustafa
Metadata
Show full item record
This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
.
Item Usage Stats
170
views
0
downloads
Cite This
In ultrasonic pulse velocity testing, frequency and the travel path length are important parameters that determine the attenuation rate and the influence of near-field effect. Higher frequencies and longer distances result in higher attenuation. On the other hand, smaller path lengths are not desirable due to near-field effect. This study investigated the effect of transducer frequency and the length of path used to determine ultrasonic wave velocity in monitoring the hydration process of fresh cement mortars. For this purpose, an experimental set-up was prepared to observe the ultrasonic pulse velocity (UPV) development in cement mortars during the first 24 hours after mixing. Mortar mixtures with a water/cement ratio of 0.5 were tested for 15, 10 and 5 cm travel path lengths at 54, 82 and 150 kHz frequencies. UPV curves were obtained in each test and some characteristic points on the curves were determined. The results showed that choosing the appropriate frequency and travel path distance is important in monitoring the UPV development in fresh cementitious materials.
Subject Keywords
Fresh cement mortar
,
Frequency
,
Hydration
,
Travel path length
,
Ultrasonic test method
URI
https://hdl.handle.net/11511/31089
Journal
RILEM Bookseries
DOI
https://doi.org/10.1007/978-94-007-0723-8_62
Collections
Graduate School of Natural and Applied Sciences, Article
Suggestions
OpenMETU
Core
Effects of array guided surface waves on radiation characteristics of a finite planar printed dipole array
Aydın Çivi, Hatice Özlem; Pathak, PH (2004-06-26)
The presence of surface waves different from the conventional grounded dielectric substrate surface wave modes, which can be excited on a finite periodic radiating array of printed dipoles, at frequencies for which the spacing between dipoles is typically less than half a wavelength is studied. The effects of such array guided surface waves on the array radiation characteristics are investigated. Techniques to suppress these surface waves are also discussed.
Compensation of Dead-time Effects in Three-level Neutral Point Clamped Inverters based on Space Vector PWM
Mese, Huseyin; Ersak, Aydın (2011-09-10)
hi this study the effects of dead-time in three-level neutral-point-clamped (NYC) inverter is analyzed and a compensation algorithm based on space vector pulse width modulation (PWJI) is proposed. In three phase inverter applications, different modulation techniques are utilized depending on the application. Among these, space vector pulse width modulation (SVPWM) technique is the modulation technique with which best bus bar utilization is achieved. This modulation technique is also applicable to three-leve...
Effects of periodic flow fluctuations on magnetic resonance flow images
Uludağ, Yusuf; McCarthy, MJ (Wiley, 2004-08-01)
The effects of periodic velocity fluctuations on magnetic resonance flow images are investigated experimentally and theoretically. In the experiments, laminar pipe flow of water was examined. The flow was driven by a constant pressure head with a superimposed sinusoidal component with the frequency m, varied from 0 to 1 Hz, whereas in the simulations omega(z) was between 0 to 65 Hz. The velocity profiles obtained from the experimental results compare well with the theoretical calculations. Both theory and e...
Effects of Substrate Parameters on the Resonance Frequency of Double-sided SRR Structures under Two Different Excitations
Ekmekci, E.; Averitt, R. D.; Sayan, Gönül (2010-07-08)
In this study, we numerically investigate the effects of substrate parameters (i.e., the thickness and the permittivity) on the resonance frequency of the double-sided SRR (DSRR) structure under two different excitation conditions. This includes either electric or magnetic excitations which are two common techniques to obtain a resonant effective permittivity or permeability, respectively. The numerical calculations are performed using CST Microwave Studio. The numerical results reveal a similar trend in th...
Prospects of FMCW-based frequency diverse array radar
Cetiner, Ramazan; Cetintepe, Cagri; Demir, Şimşek; Hizal, Altunkan (2019-11-01)
The linear frequency modulated (LFM) frequency modulated continuous wave (FMCW)-based frequency diverse array (FDA) radar concept is investigated in detail. The radar operates as a linear pulsed FMCW/FDA in the transmission (TX) mode while it operates as a pulsed FMCW/phased array (PA) in the receiving mode. The issues such as low signal-to-noise ratio (SNR) of FDA, the time-angle scanning and time-range ambiguities are studied. It is shown that the local instantaneous frequency bandwidth is much smaller th...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
Ö. K. Keskin, İ. Ö. Yaman, and M. Tokyay, “Effects of experimental parameters in monitoring the hydration of cement mortars by ultrasonic testing,”
RILEM Bookseries
, pp. 437–443, 2012, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/31089.