Feasibility Study of Carbon Fiber Reinforced Cementitious Composite on Strain Measurement
Date Issued
2012
Date
2012
Author(s)
Lien, Wan-Yu
Abstract
Structural monitoring system is important in civil engineering. There are some advantages in carbon fiber reinforced concrete, such like 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 CFRCC (Carbon Fiber Reinforced Cementitious Composite) as the structural monitoring sensor. CFRCC 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.
To consider the economic, the fiber content is only 0.2 vol.% less than half of the amount of 0.48 vol.% used in references【14】【15】【17】. The experimental results shows that the conductivity of materials is significantly improved and CFRCC can be used as a strain measurement and damage detection in the fiber content of 0.2 vol.%. Moreover, the experimental results of coating beams can be the database for applications in the future.
Subjects
Carbon fiber
Fractional change in electrical resistance
Methyl cellulose
Coating
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-101-R99521219-1.pdf
Size
23.32 KB
Format
Adobe PDF
Checksum
(MD5):9db035f33cfb4f7d672ca4261f3aa988