Self-sensing carbon fiber reinforced concrete for strain measurement and damage detection
Journal
Journal of the Chinese Institute of Civil and Hydraulic Engineering
Journal Volume
26
Journal Issue
1
Date Issued
2014-01-01
Author(s)
Abstract
Structural monitoring system is important in civil engineering. There are some advantages in carbon fiber reinforced concrete, such as high tensile strength, high ductility which increase seismic capacity and security of structures. The traditional structural monitoring system has some disadvantage such as the life of sensor is shorter than structures. To find a sensor with long life as structure, in this research we used CFRC (Carbon Fiber Reinforced Concrete) as the structural monitoring sensor. CFRC with the functionality similar to piezoresistivity material can be used as a self-sensing material for strain measurement and damage detection. It is based on the reversible effect of strain on the volume electrical resistivity and the irreversible effect of damage on the resistivity. The strain sensing behavior is such that the resistivity decreases reversibly upon compression due to the slight push-in of crack-bridging fibers and the consequent decrease of the contact electrical resistivity of the fiber-cement interface. Similarly, the resistivity increases reversibly upon tension due to the slight pull-out of crack-bridging fibers and the consequent decrease of the contact resistivity.
Subjects
CFRC | Damage detection | Self-sensing | Strain measurement
Type
journal article