2. CONTENT
1. INTRODUCTION
2. INVENTOR AND INVENTION
3. SELF SENSING CONCRETE
4. LABORATORY EXPERIMENT
5. RESULT AND DISCUSSION
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3. INTRODUCTION
Concrete that is itself a sensor of strain or stress.
The sensing ability is not due to the embedment or attachment of sensors.
The concrete has been modified through the use of admixtures so that it becomes a sensor
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4. INTRODUCTION
The sensing ability of smart concrete are based on the change of electrical resistance.
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5. INVENTOR AND INVENTION
Invented by Professor Deborah Chung in University at Buffalo, State University of New York. (1993)
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6. Self Sensing Concrete
1.Smart Concrete Produced From Short Carbon Fibres
2.Smart Concrete Produced from CNTs
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7. Self Sensing Concrete
1.Smart Concrete Produced From Short Carbon Fibres
Contain short carbon fibres, typically 5 mm in length
Fibre content is 0.2 vol. % of cement
Silica fume content is 15% by weight of cement
Methylcellulose content is 0.4% by weight of cement
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9. Self sensing concrete
2. Smart Concrete Produced from CNTs
Carbon nanotubes (CNTs) are seamless tubular structures.
The diameters of CNTs are in the range of 1~20 nm
The lengths are in the range of 0.2~5 μm.
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11. The mix was prepared with:
Fibre content is 0.2 vol. % of cement
Silica fume content is 15% by weight
of cement
Methylcellulose content is 0.4% by
weight of cement
1. The mix was molded into square
shape with 2 embedded electrode, 1
cm apart.
2. The specimen were cured at standard
temperature of 20 degrees centigrade
and 100 % humidity.
3. Specimens were dried at temperature
of 50 degrees centigrade for 5 days.
EXPERIMENT
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15. CONCLUSION
•The piezoresitive property of carbon nanotubes/CFs enables the composite to detect the stress/stain inside the pavement.
•Experimental results demonstrated that the CNT/cement composite function as excellent stress/strain sensors
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16. RFERENCES
REFERENCES
[1] B. Demirel, S. Yaziciog˘lu and N. Orhan. (December 2006). Electrical behaviour of carbon fibre-reinforced. Magazine of
Concrete Research, 7.
[2] Chung, D. D. (2006). The Road to Scientific Success. Singapore: World Scientific Pubilishing Co.Pte.Ltd.
[3] Chung, D. D. (1994). Carbon Fiber Composite. Washington: Butterworth-Heinemann.
[4] Chung, D. D. (13 October 1994). Strain sensor based on resistance change accompanying the reversible pull-out of
conducting short fibers in a less conducting matrix. Smart Mater. Strum.
[5] Dr. Xun Yu, Dr. Eil Kwon. (April 2012). Carbon Nanotube Based Self-sensing Concrete for Pavement. Washington:
University of Minnesota Duluth.
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