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Enhanced Post-crack Load Carrying Capacity of Nano and Micro Scale Carbon Fiber Reinforced Mortars

  • Maria G. FalaraEmail author
  • Maria S. Konsta-Gdoutos
  • Emmanuel E. Gdoutos
Conference paper
Part of the Structural Integrity book series (STIN, volume 8)

Abstract

A thorough investigation of the pre-peak, first crack and post-crack flexural response, energy absorption performance and ductility of cement mortar composites with hybrid reinforcement using nano and micro scale carbon fibers took place in this study. Young’s modulus, energy absorption capability and energy based dimensionless indices (toughness indices) were investigated through the Linear Elastic Fracture Mechanics theory. Prismatic notched specimens of neat mortar and mortars reinforced with 0.1 vol.% CNFs and/or 0.5 vol.% CFs were subjected to a three-point close loop bending test, using the crack mouth opening displacement, CMOD. Combined networks of CNFs and CFs were incorporated in mortar matrix in order to investigate the synergistic effect of hybrid reinforcement on the mechanical properties of the single-reinforced mortars. The experimental results showed an exceptional multi scale mechanical performance of nano and micro scale fiber reinforced mortars as reflected from the load-CMOD response of specimens. The energy absorption capability and load carrying capacity of multiscale reinforced mortars after the formation of the initial crack (first crack), are outstandingly improved as indicated by the 138 and 100% increases of the proposed size independent toughness indices, up to the peak load and the ultimate failure, respectively.

Keywords

Carbon nanofibers Carbon fibers Energy absorption capability Toughness indices 

Notes

Acknowledgements

The authors would like to kindly acknowledge the financial support from the Academy of Athens under the Research Funding Program “Improving structural performance and monitoring of damage in nanomodified concrete composites using carbon nanotubes and carbon nanofibers” (200/903).

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Maria G. Falara
    • 1
    Email author
  • Maria S. Konsta-Gdoutos
    • 2
  • Emmanuel E. Gdoutos
    • 3
  1. 1.School of EngineeringDemocritus University of ThraceXanthiGreece
  2. 2.Department of Civil EngineeringCollege of Engineering, University of Texas at ArlingtonArlingtonUSA
  3. 3.Academy of AthensAthensGreece

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