Effect of Moisture Adsorption on the Electrical Properties of Hardened Portland Cement Compacts

1995 ◽  
Vol 78 (6) ◽  
pp. 1673-1679 ◽  
Author(s):  
Daniel E. Wilkosz ◽  
J. Francis Young
Keyword(s):  
Electrical Properties ◽  
Portland Cement ◽  
Moisture Adsorption ◽  
Effect Of Moisture

Effect Of Moisture On The Physical Properties Of Polyimide Films

1991 ◽  
Vol 227 ◽  
Author(s):  
Rajeevi Subramanian ◽  
Michael T. Pottiger ◽  
Jacqueline H. Morris ◽  
Joseph P. Curilla
Keyword(s):  
Dielectric Constant ◽  
Steady State ◽  
Electrical Properties ◽  
Relative Humidity ◽  
Quartz Crystal ◽  
Moisture Absorption ◽  
Relative Dielectric Constant ◽  
Moisture Uptake ◽  
Polyimide Films ◽  
Effect Of Moisture

ABSTRACTMoisture absorption and its effect on electrical properties were measured for several polyimides. A Quartz Crystal Microbalance (QCM) was used to investigate the moisture absorption in BPDA/PPD, PMDA/ODA, and BTDA//ODA/MPD polyimides. The steady-state moisture uptake in polyimides as a function of relative humidity (RH) was determined by exposing film samples to successively higher RH values ranging from 10 to 85% at 25°C. The isothermal moisture absorption as a function of percent RH was found to be nearly linear for all of the polyimides studied. The effect of moisture on the electrical properties of a BPDA/PPD polyimide was also investigated. The relative dielectric constant at 25 °C was found to be a linear function of the moisture absorbed.

Effect of Moisture on the Electrical Properties of Bone

1976 ◽  
Vol 123 (10) ◽  
pp. 1451-1455 ◽  
Author(s):  
G. B. Reinish ◽  
A. S. Nowick
Keyword(s):  
Electrical Properties ◽  
Effect Of Moisture

Impedance Spectroscopy and the Role of Admixtures in the Hydration of Portland Cement Pastes

1991 ◽  
Vol 245 ◽  
Author(s):  
Bruce J. Christensen ◽  
Thomas O. Mason ◽  
Hamlin M. Jennings
Keyword(s):  
Electrical Properties ◽  
Impedance Spectroscopy ◽  
Portland Cement ◽  
Silica Fume ◽  
Pore Fluid ◽  
Microstructural Development ◽  
Portland Cements ◽  
Cement Pastes ◽  
Degree Of Hydration

ABSTRACTMeasurements of the bulk electrical properties of cement pastes were made using impedance spectroscopy (IS) and are useful for studying hydration. Normalization of these quantities by dividing out changes in the pore fluid reveals information pertinent to the microstructural development of these materials. In this study, observations are made on the influence of accelerators, retarders and silica fume (SF) on pastes of white and ordinary portland cements (OPC). All systems show variations in the normalized electrical properties at the same degree of hydration, as compared to a control. Changes in the microstructure that are implied by these measurements are consistent with the observations of others.

Differences in Electrical Properties of Portland Cement and Alkali-Activated Slag Mortars

2018 ◽  
Vol 276 ◽  
pp. 15-20 ◽  
Author(s):  
Pavel Rovnaník ◽  
Maria Míková ◽  
Ivo Kusák ◽  
Patrik Bayer
Keyword(s):  
Electrical Properties ◽  
Portland Cement ◽  
Building Materials ◽  
Elevated Temperatures ◽  
Sodium Ions ◽  
Alkali Activated Slag ◽  
Self Heating ◽  
Chemical Attack ◽  
Activated Slag ◽  
Alkali Activated

Alkali-activated slag is known as a building material for more than sixty years and is considered an alternative to Portland cement based binders. Compared to Portland cement it exhibits some superior properties such as higher resistance against chemical attack and exposure to elevated temperatures. Aluminosilicate binders are generally electrical insulators; however, electrical properties of building materials gain the importance in the new field of applications such as self-sensing or self-heating materials. This paper brings a comparison of the electrical properties, especially resistance and capacitance, between Portland cement and alkali-activated slag mortars. The measurements revealed that alkali-activated slag shows enhanced conducting properties due to the presence of mobile hydrated sodium ions and metallic iron microparticles.

Acoustic and electrical properties of 1–3 connectivity bismuth sodium titanate–Portland cement composites

2014 ◽  
Vol 60 ◽  
pp. 353-358 ◽  
Author(s):  
Rattiyakorn Rianyoi ◽  
Ruamporn Potong ◽  
Athipong Ngamjarurojana ◽  
Rattikorn Yimnirun ◽  
Ruyan Guo ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Portland Cement ◽  
Sodium Titanate ◽  
Cement Composites ◽  
Bismuth Sodium Titanate ◽  
Bismuth Sodium
Sign in / Sign up

Export Citation Format

Share Document