Numerical modeling on the stress-strain response and fracture of modeled recycled aggregate concrete

Wengui Li, Jianzhuang Xiao*, David J. Corr, Surendra P. Shah

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

4 Scopus citations

Abstract

According to the nanoindentation tests, the constitutive relationship of the Interfacial Transition Zones (ITZs) in Recycled Aggregate Concrete (RAC) is proposed with a plastic-damage constitutive model. Based on the meso/micro-scale constitutive relations of mortar matrix, numerical studies were undertaken on Modeled Recycled Aggregate Concrete (MRAC) under uniaxial loadings to predict mechanical behavior, particularly the stress-strain response. The tensile stress tends to concentrate in the ITZs region, which leads to the development of microcracks. After the calibration and validation with experimental results, the effects of the mechanical properties of ITZs and new mortar matrix on the stress-strain response and fracture of MRAC were analyzed. The FEM modeling is capable of simulating the complete stress-strain relationship of MRAC, as well as the overall fracture pattern. It reveals that the mechanical properties of new mortar matrix and the corresponding new ITZ play a significant role in the overall stress-strain response and fracture process of MRAC.

Original languageEnglish (US)
Pages749-759
Number of pages11
StatePublished - 2013
Event13th International Conference on Fracture 2013, ICF 2013 - Beijing, China
Duration: Jun 16 2013Jun 21 2013

Other

Other13th International Conference on Fracture 2013, ICF 2013
CountryChina
CityBeijing
Period6/16/136/21/13

Keywords

  • Fracture
  • Interfacial transition zones (ITZs)
  • Modeled recycled aggregate concrete (MRAC)
  • Plastic-damage constitutive model
  • Stress-strain response

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

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