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Effect of acid corrosion on crack propagation of concrete beams

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Abstract

The effect of acid corrosion on crack propagation of concrete beams was theoretically studied by the method of crack extension resistance curve. Based on this method, a calculation approach was proposed to determine fracture stress intensity factors in crack propagation of concrete beams. Loop iteration analysis was carried out to calculate maximum bearing capacity load, unstable crack toughness, resistance toughness curve, cohesive toughness curve and load–crack mouth opening displacement. Both bilinear and nonlinear softening traction–separation curves were adopted for each of these calculation parameters. The analysis results of each showed the effect of acid corrosion degrees. The influence of acid corrosion on fracture properties was discussed through the calculated results of cohesive toughness curves. These five kinds of simulated results were basically consistent, before the load attained the maximum value. However, with further crack propagation, cohesive toughness of nonlinear softening model was significantly larger than that of bilinear softening model, and the descending branch of P–CMOD curve by nonlinear law is higher than that by bilinear law. To validate the approach, tests of specimens under six different corrosion periods were experimentally studied, using three-point bending notched concrete beams soaked in sulphuric acid solution. The Double-K fracture parameters were investigated based on the test results, and load–crack mouth opening displacement curves for different acid conditions were obtained using synchronous sampling of a load sensor and clip-gauge. Numerical results by bilinear softening model showed a good correlation with the experimental ones.

Keywords

Concrete beam acid corrosion crack propagation fracture parameters KR-curve P–CMOD curve 

Notes

Acknowledgements

This research has been partially supported by the National Funds for Distinguished Young Scientists of China (51325904) and the National Major Scientific Instruments Development Project of China (51527811). The authors thank the reviewers for their useful comments and suggestions that helped in improving the paper.

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Copyright information

© Indian Academy of Sciences 2018

Authors and Affiliations

  1. 1.College of Mechanics and MaterialsHohai UniversityNanjingChina
  2. 2.Department of Materials and Structure EngineeringNanjing Hydraulic Research InstituteNanjingChina

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