Computers and Concrete

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The effective properties of saturated concrete healed by EDM with the ITZs

  • Chen, Qing (Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University) ;
  • Jiang, Zhengwu (Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University) ;
  • Zhu, Hehua (State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University) ;
  • Ju, J.W. (Department of Civil and Environmental Engineering, University of California) ;
  • Yan, Zhiguo (State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University) ;
  • Li, Haoxin (Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University)
  • Received : 2016.09.08
  • Accepted : 2017.11.14
  • Published : 2018.01.25
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Abstract

A differential scheme based micromechanical framework is proposed to obtain the effective properties of the saturated concrete repaired by the electrochemical deposition method (EDM) considering the interfacial transition zone (ITZ) effects. The constituents of the repaired concrete are treated as different phases, consisting of (micro-)cracks, (micro-)voids and (micro-)pores (occupied by water), deposition products, intrinsic concrete made up by the three traditional solid phases (i.e., mortar, coarse aggregates and their interfaces) and the ITZs. By incorporating the composite sphere assemblage (CSA) model and the differential approach, a new multilevel homogenization scheme is utilized to quantitatively estimate the mechanical performance of the repaired concrete with the ITZs. The CSA model is modified to obtain the effective properties of the equivalent particle, which is a three-phase composite made up of the water, deposition products and the ITZs. The differential scheme is employed to reach the equivalent composite of the concrete repaired by EDM considering the ITZ effects. Moreover, modification procedures considering the ITZ effects are presented to attain the properties of the repaired concrete in the dry state. Results in this study are compared with those of the existing models and the experimental data. It is found that the predictions herein agree better with the experimental data than the previous models.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China

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