SMART BEHAVIOR OF CARBON FIBER CEMENT COMPOSITES IN COMPRESSION

Abstract eng:
This paper presents results which indicate that carbon fiber-reinforced concrete has the ability to serve as a smart structural material capable of providing some information as to the conditions of internal stress, strain and cracking in the absence of any visible exterior signs of damage. Simple electrical resistance measurements can be utilized to extract this information about physical integrity from the material. Smart behavior was evaluated by performing unconfined compression tests on cylindrical carbon fiber-reinforced mortar specimens. The signal that was manifested was a reversible change in resistance when cracking was not significant (for example, when stress-strain response was still elastic), and an irreversible increase in resistance when cracking took place. Smart material capability existed even at low fiber volume contents (0.2% to 1.0%).

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