The electromechanical effect of carbon fiber reinforced cement

• Published in: Carbon (New York) 2002, Vol.40 (12), p.2273-2275
• Main Authors: Sun, Mingqing, Li, Zhuoqiu, Liu, Qingping
• Format: Article
• Language: English
• Subjects: Applied sciences; Buildings. Public works; Cement concrete constituents; Cements; Concretes. Mortars. Grouts; Exact sciences and technology; Fibre reinforced concrete (including asbestos cement); Materials; Properties and test methods; Properties of anhydrous and hydrated cement, test methods
• ISSN: 0008-6223; 1873-3891
• DOI: 10.1016/S0008-6223(02)00189-6

The smart system refers to a device or an array of devices that can sense changes in its environment and make a useful or optimal response by changing its material properties, geometry, or mechanical or electromagnetic response. Both the sensor and actuator functions with the appropriate feedback must be integrated. Carbon fiber reinforced cement (CFRC) containing fiber in amounts as small as 0.2 volume percent can perform stress sensing, temperature sensing and temperature actuating. These smart characteristics are of increasing importance because of a desire to maintain the functions of critical civil infrastructure systems, such as bridges and dams. The physical effects shown in Fig. 1 are the basis of the smart characteristics of CFRC. Besides these direct effects, there are some indirect effects. For example, the indirect electromechanical effect can be realized through the Joule effect [5] and thermal expansion [3], which have been discussed in this paper. In addition, the smart behavior of CFRC is also related to piezoresistivity [8]. Piezoresistivity in CFRC refers to changes in the volume resistance of CFRC with applied stress. The electromechanical effect in CFRC has not previously been reported.