Microwave Characterization of Cement Hydration

1991 ◽  
Vol 245 ◽  
Author(s):  
M. Moukwa ◽  
M. Brodwin ◽  
S. Christo ◽  
J. Chang ◽  
S.P. Shah
Keyword(s):  
Cement Hydration ◽  
Bound Water ◽  
Front Surface ◽  
Cementitious Materials ◽  
Test Method ◽  
Surface Reflection ◽  
Microwave Characterization ◽  
Curing Period ◽  
Non Destructive

ABSTRACTConductivity and permittivity of cements were measured during the first 24 h hydration period at 10.0 GHz using front surface reflection methods. Data trends closely followed the hypothesis that the microwave results responded to the transition from free to bound water as hydration proceeded. The results were also compared to measured hydration curves and changes in the slope of the data versus time correlated well with characteristics regions of the hydration curve. The results establish the usefulness of microwave characterization for the study of chemistry and structure during the hydration period and may lead to a non destructive test method for cementitious materials during the early curing period.

Characterization of Silicate Ceramics Using Ultrasonics Test Method

2014 ◽  
Vol 92 ◽  
pp. 194-202 ◽  
Author(s):  
Semra Kurama ◽  
Elif Eren Gültekin
Keyword(s):  
Physical Properties ◽  
Water Absorption ◽  
Bulk Density ◽  
Test Methods ◽  
Ultrasonic Test ◽  
Test Method ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Non Destructive

Non-destructive testing techniques are widely used for testing ceramic materials. In our studies, two different types of ultrasonic test methods (A-scan and C-Scan) were investigated as non-destructive testing methods for characterization of porcelain tiles. Tiles were sintered in different temperatures to change their porosity and density properties. By changing of ultrasonic time and velocity related with samples’ some physical properties (such as bulk density, apparent density, apparent porosity (%), water absorption (%)) inspected via contact A-scan ultrasonic test method. The results show that without necessity of traditional test methods, some physical properties of ceramics can be determined by using obtained ultrasonic velocity-bulk density, apparent density, apparent porosity (%) and water absorption (%) calibration plots. Additionally, various defects were inspected in samples by using water immersion ultrasonic C-scan method. These results supported this study to obtain the information about defects’ size and place in the ceramic tiles. To support this non-destructive method results scanning electron microscope (SEM) characterization was done and images give the information about the place of the defect.

Non-Destructive Characterization of Cement Materials Using Ultrasonic Method - Application to the Study of Carbonation

2014 ◽  
Vol 1065-1069 ◽  
pp. 1791-1794 ◽  
Author(s):  
Son Tung Pham
Keyword(s):  
Mechanical Properties ◽  
Ultrasonic Method ◽  
Construction Materials ◽  
Young Modulus ◽  
Cementitious Materials ◽  
Margin Of Error ◽  
Before And After ◽  
Non Destructive ◽  
Non Destructive Characterization

The objective of this study is to realize a non-destructive characterization of cementitious materials using ultrasonic method. The motivation of our work is to show that the ultrasound can be applied not only in medical imaging but also in the assessment of construction materials, which is not widely known in this domain. In order to solve the problem, the ultrasonic velocity measurement was performed on the samples before and after carbonation of a standardized mortar at different periods. The results offer the possibility to determine the mechanical properties such as Young modulus E, shear modulus G and Poisson's ratio. This is an advantage for in-situ structures in comparison with destructive methods that require destroying the samples. The main contributions of this study are: 1) Ultrasonic occultation of cement materials is a reliable method with a small margin of error; 2) The values ​​of mechanical properties found by ultrasonic method are consistent with theoretical values ​​found in the literature; 3) The evolution of these mechanical properties is consistent with the densification of the microstructure during carbonation due to the formation of CaCO3.

Non-Destructive Microwave Characterization of Ferroelectric Films on Conductive Substrates

2004 ◽  
Vol 60 (1) ◽  
pp. 1-19 ◽  
Author(s):  
PÄR RUNDQVIST ◽  
ANDREI VOROBIEV ◽  
SPARTAK GEVORGIAN ◽  
KHALED KHAMCHANE
Keyword(s):  
Ferroelectric Films ◽  
Microwave Characterization ◽  
Conductive Substrates ◽  
Non Destructive

The Concealed Blister Test: An Implementable Test Method for a Non-Destructive Strength-Characterization of Full-Wafer-Bonds

2019 ◽  
Vol 16 (8) ◽  
pp. 465-472
Author(s):  
Martin Rabold ◽  
David Busch ◽  
Senthil Ramachandran ◽  
Frank Goldschmidtboeing ◽  
Peter Woias
Keyword(s):  
Test Method ◽  
Blister Test ◽  
Strength Characterization ◽  
Non Destructive

scholarly journals The Contribution of Elastic Wave NDT to the Characterization of Modern Cementitious Media

Sensors ◽  
2020 ◽  
Vol 20 (10) ◽  
pp. 2959 ◽  
Author(s):  
Gerlinde Lefever ◽  
Didier Snoeck ◽  
Nele De Belie ◽  
Sandra Van Vlierberghe ◽  
Danny Van Hemelrijck ◽  
...  
Keyword(s):  
Mechanical Performance ◽  
Autogenous Shrinkage ◽  
Measuring Method ◽  
Cementitious Materials ◽  
Mechanical Tests ◽  
Self Healing ◽  
Destructive Testing ◽  
Superabsorbent Polymers ◽  
Non Destructive

To mitigate autogenous shrinkage in cementitious materials and simultaneously preserve the material’s mechanical performance, superabsorbent polymers and nanosilica are included in the mixture design. The use of the specific additives influences both the hydration process and the hardened microstructure, while autogenous healing of cracks can be stimulated. These three stages are monitored by means of non-destructive testing, showing the sensitivity of elastic waves to the occurring phenomena. Whereas the action of the superabsorbent polymers was evidenced by acoustic emission, the use of ultrasound revealed the differences in the developed microstructure and the self-healing of cracks by a comparison with more commonly performed mechanical tests. The ability of NDT to determine these various features renders it a promising measuring method for future characterization of innovative cementitious materials.

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