Pyroelectric behavior of cement-based materials

The pyroelectric effect, which is useful for temperature sensing, was observed in cement-based materials. The use of short steel fibers (8 mm diameter), together with polyvinyl alcohol (PVA), as admixtures greatly enhances the effect, thereby attaining pyroelectric coefficient 6 � 10 � 8 C/m 2 K (10 kHz). However, due to the high value (2500) of the relative dielectric constant, the pyroelectric voltage is lower than those of plain cement paste or carbon fiber (15 mm diameter) cement paste. Carbon fiber cement paste and plain cement paste are comparable in the pyroelectric voltage, though the pyroelectric coefficient is higher for carbon fiber cement paste than plain cement paste. The pyroelectric effect in cement-based materials is attributed to the increase in mobility of the ions as the temperature increases. D 2003 Elsevier Ltd. All rights reserved.

[1]  Cruz Alonso,et al.  Study of the Dielectric Characteristics of Cement Paste , 1998 .

[2]  James J. Beaudoin,et al.  Dielectric behaviour of hardened cement paste systems , 1996 .

[3]  Reza Zoughi,et al.  Microwave Nondestructive Estimation of Cement Paste Compressive Strength , 1995 .

[4]  Imad L. Al-Qadi,et al.  Detection of Chlorides in Concrete Using Low Radio Frequencies , 1997 .

[5]  E. Garboczi,et al.  Microstructure-electrical property relationships in cement-based materials , 1995 .

[6]  C. Andrade,et al.  Impedance measurements on cement paste , 1997 .

[7]  J. Bonnet,et al.  Dielectric characterization at high frequency (1 MHz - 1.8 GHz) of a Portland cement at the early stages of hydration , 1999 .

[8]  H. Jennings,et al.  Dielectric amplification in cement pastes , 1997 .

[9]  I. Al-Qadi,et al.  Measuring dielectric properties of concrete over low RF , 1996 .

[10]  Charles Korhonen,et al.  MEASUREMENT OF WATER CONTENT IN PORTLAND CEMENT CONCRETE , 1999 .

[11]  D.D.L. Chung,et al.  Ozone treatment of carbon fiber for reinforcing cement , 1998 .

[12]  S. O. Kasap,et al.  Principles of electrical engineering materials and devices , 1996 .

[13]  Imad L. Al-Qadi,et al.  Dielectric Properties of Portland Cement Concrete at Low Radio Frequencies , 1995 .

[14]  Y. Oh,et al.  Humidity Dependence of Apparent Dielectric Constant for DSP Cement Materials at High Frequencies , 1999 .

[15]  D. Chung,et al.  Effect of stress on the electric polarization in cement , 2001 .

[16]  J. Yang,et al.  Microwave study of hydration of slag cement blends in early period , 1995 .

[17]  C. K. Ong,et al.  Dielectric and electrical properties of ordinary Portland cement and slag cement in the early hydration period , 1996, Journal of Materials Science.

[18]  Zhuoqiu Li,et al.  A study of piezoelectric properties of carbon fiber reinforced concrete and plain cement paste during dynamic loading , 2000 .

[19]  R. Hill,et al.  The dielectric response of hydrating porous cement paste , 1996 .

[20]  Shin Yagihara,et al.  Microwave Dielectric Study of Water Structure in the Hydration Process of Cement Paste , 2005 .

[21]  Ping Gu,et al.  Dielectric behaviour of hardened cementitious materials , 1997 .

[22]  C. Ong,et al.  Study of dielectric and electrical properties of mortar in the early hydration period at microwave frequencies , 1996 .

[23]  A. Van Beek,et al.  Dielectric measurements to characterize the microstructural changes of young concrete , 1999 .

[24]  Sihai Wen,et al.  Piezoelectric cement-based materials with large coupling and voltage coefficients , 2002 .