4.6 Article

Renovation Effect of Flax FRP-Reinforced Cracked Concrete Slabs under Impact Loadings

Journal

MATERIALS
Volume 14, Issue 20, Pages -

Publisher

MDPI
DOI: 10.3390/ma14206212

Keywords

drop weight impact; fibre-reinforced concrete slab; flax fibre-reinforced polymer; renovation method

Funding

  1. National Natural Science Funds of China [52008105]
  2. Jiangsu Key Laboratory of Engineering Mechanics at Southeast University [3205009304]
  3. Natural Science Foundation of Jiangsu Province of China [BK20200374]

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Experimental and theoretical analysis were conducted to investigate the impact behavior of FFRP renovated CFRC slabs, showing the potential of FFRP composites as renovated construction materials under dynamic load conditions.
The impact behaviour of flax fibre-reinforced polymer (FFRP) renovated coconut fibre-reinforced concrete (CFRC) slabs was investigated through two series of experiments and theoretical analysis. The first experiment was carried out to find out the effectiveness of FFRP retrofitted method for the partly damaged concrete structure and its performance under impact loadings. The renovation process was applied on the pre-cracked rectangular CFRC slabs of 600 mm x 300 mm x 50 mm with FFRP laminates, before the repeated impact tests. Then, the parameters of these slabs, i.e., impact force history, deflection history and damage pattern, were discussed in detail. Another experiment was conducted on the FFRP-CFRC square slabs with a dimension of 600 mm x 600 mm x 50 mm. Based on test results, the effect of different FFRP configurations was discussed to find out the effective reinforcement method. In addition, the two-degree-of-freedom spring-mass model was applied to predict the impact force. Results demonstrate that FFRP composites have a good potential to be utilised as renovated construction materials under dynamic load conditions.

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