Versatility of Piezoelectric Ring Actuator Technique (P-RAT) for Characterization of Cement Paste and Mortar

2017 ◽  
Vol 6 (1) ◽  
pp. 20160039 ◽  
Author(s):  
S. Naji ◽  
M. Karray ◽  
K. H. Khayat
Keyword(s):  
Cement Paste ◽  
P Rat

Characterization of high strength cement paste with pristine graphite and heptane-graphite emulsion

2016 ◽  
Author(s):  
Aileen Vandenberg ◽  
Daniel Massucci ◽  
Steven Woltornist ◽  
Douglas Adamson ◽  
Kay Wille
Keyword(s):  
Cement Paste ◽  
High Strength

Quantitative Characterization of Hydration of Cement Pastes by Rietveld Phase Analysis and Thermoanalysis

2013 ◽  
Vol 539 ◽  
pp. 19-24 ◽  
Author(s):  
Yong Qi Wei ◽  
Wu Yao
Keyword(s):  
Phase Analysis ◽  
Cement Paste ◽  
Rietveld Method ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Quantitative Characterization ◽  
Cement Pastes ◽  
Hydration Mechanism ◽  
Spot Check

The quantitative characterization of hydration of cement pastes has always been one of focuses of researchers’ attention. Rietveld phase analysis (RPA), a combination of quantitative X-ray diffraction (QXRD) and the Rietveld method, supplies a tool of an enormous potential for that. Although a few of related researches were conducted by RPA, the reported attention was not paid to the neat cement paste with a low w/c ratio. Therefore, this work aimed at the quantitative study on hydration of such a cement paste chiefly by this method, meanwhile, cooperated with the hyphenated technique of thermogravimetry with differential scanning calorimetry (TG-DSC), as a spot check. Results indicated that RPA was a reliable method in quantitatively characterizing hydration of cement pastes, and gave a clear decription of evolution of all main crystal phases in cement pastes; and that the evolution of monosulphate(Afm_12) was also able to be tracked quantitatively. This will help to understand better the hydration mechanism of cement pastes, as well as to investigate quantitatively effects of mineral and chemical admixtures on hydration of composite cementitious systems.

Critical Insights in Laboratory Shear Wave Velocity Correlations of Clays

2021 ◽  
Author(s):  
Dania Elbeggo ◽  
Yannic Ethier ◽  
Jean-Sébastien Dubé ◽  
Mourad Karray
Keyword(s):  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Earth Pressure ◽  
Dynamic Parameter ◽  
Clay Deposits ◽  
Sample Disturbance ◽  
P Rat

Shear wave velocity is an important mechanical/dynamic parameter allowing the characterization of a soil in the elastic range (γ < 0.001 %). Thirty five existing laboratory correlations of small strains shear modulus or shear wave velocity were examined in this study and are grouped into different general forms based on their geotechnical properties. A database of 11 eastern Canadian clay deposits was selected and used for the critical insights. The effect of the coefficient of earth pressure at rest was also examined. A range of variation for each general form of correlation was determined to take the plasticity index and void ratio values of investigated sites into account. The analysis shows a significant scatter in normalized shear wave velocity values predicted by existing correlations and raises questions on the applicability of these correlations, especially for eastern Canadian clays. New correlations are proposed for Champlain clays based on laboratory measurement of shear wave velocity using the piezoelectric ring actuator technique, P-RAT, incorporated in consolidation cells. An analysis of P-RAT results reveals the sample disturbance effect and suggests an approach to correct the effect of disturbance on laboratory shear wave velocity measurements. The applicability of the proposed correlations, including the disturbance correction, is validated by comparison with in situ measurements using multi-modal analysis of surface waves (MMASW).

scholarly journals Microstructure and Nanoscaled Characterization of HVFA Cement Paste Containing Nano-SiO2 and Nano-CaCO3

2017 ◽  
Vol 29 (8) ◽  
pp. 04017063 ◽  
Author(s):  
Faiz U. A. Shaikh ◽  
Steve W. M. Supit ◽  
Salim Barbhuiya
Keyword(s):  
Cement Paste ◽  
Nano Sio2

CHARACTERIZATION OF AIR VOIDS IN FRESH CEMENT PASTE THROUGH ULTRASONIC NONDESTRUCTIVE TESTING

2008 ◽  
Author(s):  
R. M. Kmack ◽  
L. J. Jacobs ◽  
K. E. Kurtis ◽  
J.-Y. Kim ◽  
Donald O. Thompson ◽  
...  
Keyword(s):  
Nondestructive Testing ◽  
Cement Paste ◽  
Ultrasonic Nondestructive Testing ◽  
Air Voids
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