Engineered cementitious composites (ECC) is a class of high-performance fiber reinforced cementitious composites featuring the strain hardening behavior under tension. The high tensile ductility of ECC results in high impact resistance and energy absorption capacity which make ECC ideal for application in impact resistance structures, like crash barriers compared to regular concrete. Concrete crash barriers, due to the low energy absorption capacity and material rigidity, are severe safety threats to vehicles and passengers. It was envisioned that by employing ECC in the design of concrete crash barriers, impact resistance of the barriers will be effectively improved; damage to vehicles and passengers during vehicle-barrier collisions will be reduced; service life of concrete barriers will be extended; and maintenance cost will be reduced. However, due to high material cost and lack of local availability, the field application of ECC has been greatly limited.
This research presents the results of tailoring the economical ECC using locally available poly-vinyl alcohol (PVA) fibers and river sand for impact resistance. Material tailoring was conducted under the guidance of micromechanics design principle by adjusting the fiber, matrix and interface properties to retain the tensile ductility. The tensile and flexural behavior of the developed material were characterized under pseudo-static loading and high strain rate loading up to 10-1/s. Direct drop-weight impact test was conducted to assess the impact resistance and energy absorption capacity of the material. It was ensured that ECC maintains the tensile strain capacity above 2% under all tested strain rates. Comparing the damage characteristics, energy absorption capacity and load-bearing capacity during repeated impact loading with regular R/C panels, ECC was found to have superior energy dissipation capacity, and damage tolerance. The research result has demonstrated that the newly developed ECC has a great potential for crash barrier applications.
|Commitee:||Gopu, Vijaya K.A., Khattak, Mohammad Jamal, Tatar, Jovan|
|School:||University of Louisiana at Lafayette|
|School Location:||United States -- Louisiana|
|Source:||MAI 58/05M(E), Masters Abstracts International|
|Subjects:||Engineering, Civil engineering|
|Keywords:||Crash barriers, Ductile, Engineered cementitious composites, Impact, Poly-vinyl alcohol|
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