电致水泥基材料的形状变化

Proceedings of 1994 IEEE International Symposium on Applications of Ferroelectrics Pub Date : 1994-08-07 DOI:10.1109/ISAF.1994.522482

Hua Ai, Jiefang Li, D. Viehland

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引用次数: 0

摘要

采用干涉测量技术研究了硬化波特兰水泥膏体的机电性能与测量频率和直流偏压的关系。在暴露于湿气中的毫米厚试样中发现了100 A左右的大电场诱导形状变化。此外，在大交流磁场循环时发现了强磁滞效应。干燥样品被发现没有表现出场致变形。这种异常行为的机制被认为是电渗透诱导的孔隙结构膨胀。通过对多孔硅胶的相应研究，发现了支持这一假设的证据。

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Electrically-induced shape changes in cement-based materials

The electromechanical behavior of hardened portland cement paste has been investigated as a function of measurement frequency and DC electrical bias using an interferometric technique. Large field induced shape changes on the order of 100 A have been found in millimeter thick specimens exposed to moisture. In addition, strong hysteresis effects were found on cycling a large AC field. Dry samples were found to exhibit no field-induced deformations. The mechanism underlying this anomalous behavior is believed to be an electro-osmotically induced swelling of the pore structures. Evidence in support of this hypothesis was found by corresponding investigations of porous silica gels.

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Proceedings of 1994 IEEE International Symposium on Applications of Ferroelectrics

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