A discrete model for Alkali-Silica-Reaction in concrete

M. Alnaggar, Gianluca Cusatis, G. Di Luzio

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

The safety and durability of a large number of structures, especially in high humidity environments, are endangered by Alkali-Silica Reaction (ASR). ASR is characterized by two processes: the first is the formation of gel which happens when water transmitted alkali come in contact with reactive silica in aggregates; the second is the imbibition of water into this formed basic gel and the consequent swelling, which, in turn, causes deterioration of concrete internal structure by a diffuse cracking. In this paper, the ASR effect on concrete deterioration is implemented within the framework of a mesoscale formulation, the Lattice Discrete Particle Model (LDPM), that simulates the heterogeneity of the concrete internal structure as well as the thermo-chemo-mechanical characteristics of the ASR reaction. The proposed formulation allows a precise and unique modeling of ASR effect including non-uniform expansions, expansion transfer and heterogeneous cracking. The model can replicate ASR cracking behavior in free and confined expansion tests. This paper presents calibration and validation of the present model on the basis of experiments for unrestrained specimens under various axial loadings undergoing ASR expansion. The results show good agreement with the experimental data.

Original languageEnglish (US)
Title of host publicationProceedings of the 8th International Conference on Fracture Mechanics of Concrete and Concrete Structures, FraMCoS 2013
Pages1315-1326
Number of pages12
StatePublished - Jul 15 2013
Event8th International Conference on Fracture Mechanics of Concrete and Concrete Structures, FraMCoS 2013 - Toledo, Spain
Duration: Mar 11 2013Mar 14 2013

Other

Other8th International Conference on Fracture Mechanics of Concrete and Concrete Structures, FraMCoS 2013
CountrySpain
CityToledo
Period3/11/133/14/13

Keywords

  • Alkali-Silica Raction
  • Cohesive Fracture
  • Durability
  • Latice Discrete Particle Model

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction

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