Abstract
Portland cement pastes 1 day to 1 month old were each subjected to a single cycle of 1250 V/m electric field (15 s forward, 15 s off, 15 s reverse) and analyzed for microstructural/transport changes by impedance spectroscopy. All samples experienced an irreversible increase in resistance, as much as 20-25%, which decreased with increasing age of the paste. Subsequent applications of field produced no additional changes. The resistance increases were shown to be attributable to decreases in pore network connectivity rather than to changes in overall degree of hydration, capillary porosity, or pore fluid conductivity. It is proposed that electro-osmotic swelling of product near `bottleneck' pores results in the decreased connectivity. Ramifications for electrocuring, electromigration, electrochemical chloride treatment, and permeability studies of cement based products and structures are also discussed.
| Original language | English |
|---|---|
| Pages (from-to) | 81-85 |
| Number of pages | 5 |
| Journal | Advanced Cement Based Materials |
| Volume | 7 |
| Issue number | 3-4 |
| DOIs | |
| Publication status | Published - Apr 1998 |
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ASJC Scopus subject areas
- Industrial and Manufacturing Engineering
- Ceramics and Composites
Cite this
Electrically induced microstructural changes in portland cement pastes. / Sohn, Donggy; Mason, Thomas O.
In: Advanced Cement Based Materials, Vol. 7, No. 3-4, 04.1998, p. 81-85.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Electrically induced microstructural changes in portland cement pastes
AU - Sohn, Donggy
AU - Mason, Thomas O
PY - 1998/4
Y1 - 1998/4
N2 - Portland cement pastes 1 day to 1 month old were each subjected to a single cycle of 1250 V/m electric field (15 s forward, 15 s off, 15 s reverse) and analyzed for microstructural/transport changes by impedance spectroscopy. All samples experienced an irreversible increase in resistance, as much as 20-25%, which decreased with increasing age of the paste. Subsequent applications of field produced no additional changes. The resistance increases were shown to be attributable to decreases in pore network connectivity rather than to changes in overall degree of hydration, capillary porosity, or pore fluid conductivity. It is proposed that electro-osmotic swelling of product near `bottleneck' pores results in the decreased connectivity. Ramifications for electrocuring, electromigration, electrochemical chloride treatment, and permeability studies of cement based products and structures are also discussed.
AB - Portland cement pastes 1 day to 1 month old were each subjected to a single cycle of 1250 V/m electric field (15 s forward, 15 s off, 15 s reverse) and analyzed for microstructural/transport changes by impedance spectroscopy. All samples experienced an irreversible increase in resistance, as much as 20-25%, which decreased with increasing age of the paste. Subsequent applications of field produced no additional changes. The resistance increases were shown to be attributable to decreases in pore network connectivity rather than to changes in overall degree of hydration, capillary porosity, or pore fluid conductivity. It is proposed that electro-osmotic swelling of product near `bottleneck' pores results in the decreased connectivity. Ramifications for electrocuring, electromigration, electrochemical chloride treatment, and permeability studies of cement based products and structures are also discussed.
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UR - http://www.scopus.com/inward/citedby.url?scp=0032046942&partnerID=8YFLogxK
U2 - 10.1016/S1065-7355(97)00056-4
DO - 10.1016/S1065-7355(97)00056-4
M3 - Article
VL - 7
SP - 81
EP - 85
JO - Cement and Concrete Research
JF - Cement and Concrete Research
SN - 0008-8846
IS - 3-4
ER -