Now showing items 1-20 of 20

    • ASR expansions at the level of a single glass-cement paste interface: experimental results and proposal of a reaction-expansion mechanism 

      Liaudat, Joaquín; Carol, Ignacio; López Garello, Carlos María; Leemann, Andreas (Elsevier, 2019-09)
      Article
      Open Access
      A new experimental methodology for studying ASR expansions at the level of a single aggregate-cementitious matrix interface is proposed. For this methodology, small sandwich-like specimens, with cement paste or mortar on ...
    • ASR expansions in concrete under triaxial confinement 

      Liaudat, Joaquín; Carol, Ignacio; López Garello, Carlos María; Saouma, Victor E. (2018-02)
      Article
      Open Access
      It is well known that the Alkali-Silica Reaction (ASR) expansion in concrete is influenced by the stress state of the material. However, the extent and nature of this influence is not completely understood due to the ...
    • Avoiding fracture instability in wedge splitting tests by means of numerical simulations 

      Liaudat, Joaquín; Garolera, D.; Martínez, A.; Carol, Ignacio; Lakshmikantha, M.R.; Alvarellos, J. (CIMNE, 2017)
      Conference report
      Open Access
      In this paper, unstable fracture propagation obtained in a in-house performed experimental Wedge Splitting Test (WST) is simulated by means of the FEM and fracturebased zero-thickness interface elements. In order to obtain ...
    • Avoiding fracture instability in wedge splitting tests by means of numerical simulations 

      Liaudat, Joaquín; Garolera Vinent, Daniel; Martínez Estévez, Ariadna; Carol, Ignacio; Lakshmikantha, Ramasesha Mookanahallipatna; Alvarellos Iglesias, José (2017)
      Conference report
      Open Access
      In this paper, unstable fracture propagation obtained in a in-house performed experimentalWedge Splitting Test (WST) is simulated by means of the FEM and fracture- based zero-thickness interface elements. In order to obtain ...
    • Coupled C-M meso-scale model for ASR expansion in concrete 

      Liaudat, Joaquín; López Garello, Carlos María; Carol, Ignacio (CRC Press/Balkema, 2018)
      Conference report
      Restricted access - publisher's policy
      As part of an ongoing development, this paper presents a brief description of a new Chemo-Mechanical (C-M) model for the expansions due to Alkali-Silica Reaction (ASR) in concrete. This model has been formulated at the ...
    • Diffusion-reaction model for alkali-silica reaction in concrete 

      Liaudat, Joaquín; López Garello, Carlos María; Carol, Ignacio (CIMNE, 2013)
      Conference report
      Open Access
      A new diffusion-reaction model for the potentially deleterious Alkali-Silica Reaction (ASR) process in concrete is presented. The model involves three coupled diffusion processes, two in-goingand one out-goingfrom the ...
    • Diffusion-reaction modelling of the degradation of oil-well cement exposed to carbonated brine 

      Martínez Estévez, Ariadna; Liaudat, Joaquín; López Garello, Carlos María; Carol, Ignacio (2017)
      Conference report
      Open Access
      The essential aspects of a diffusion-reaction model in development for the degradation process of oil-well cement exposed to carbonated brine are presented in this paper. The formulation consists of two main diffusion/reaction ...
    • Experimental and numerical study of the effect of stress on ASR expansions in concrete 

      Liaudat, Joaquín (Universitat Politècnica de Catalunya, 2018-06-15)
      Doctoral thesis
      Open Access
      This thesis aims at deepening in the understanding of the mechanisms by which the stress state affects the development of concrete expansions and cracking due to the Alkali-Silica Reaction (ASR). With this purpose, a ...
    • Free expansion tests for ASR at the level of a single aggregate-matrix interface: experimental results and numerical modelling 

      Liaudat, Joaquín; López Garello, Carlos María; Carol, Ignacio (Springer, 2015)
      Conference report
      Restricted access - publisher's policy
      As part of an on-going research project, a model being developed to simulate ASR in concrete is described. The formulation consists of the three main diffusion/reaction field equations for the concentrations of Alkali, ...
    • Model for alkali-silica reaction expansions in concrete using zero-thickness chemo-mechanical interface elements 

      Liaudat, Joaquín; Carol, Ignacio; López Garello, Carlos María (2020-12)
      Article
      Open Access
      Alkali-Silica Reaction (ASR) is a particular type of chemical reaction in concrete, which produces cracking and overall expansion of the affected structural element due to the formation of expansive reaction products within ...
    • Modeling concrete expansions via couped C-M mesoscale analysis with zero-thickness interface elements, and lab experiments 

      Carol, Ignacio; Liaudat, Joaquín; López Garello, Carlos María (ISTE-Wiley, 2017)
      Conference report
      Restricted access - publisher's policy
      This paper briefly summarizes ongoing developments on C-M coupled modelling of concrete swelling due to external sulfate attack and due to alkali-silica reaction. Both models are based on a meso-mechanical model for concrete, ...
    • Modelling acid attack of oil-well cement exposed to carbonated brine: effect of specimen geometry on experimental results 

      Barandiarán Villegas, Lucía Belén; Liaudat, Joaquín; López Garello, Carlos María; Carol, Ignacio (CIMNE, 2019)
      Conference report
      Open Access
      In recent years, the authors and co-workers have developed a diffusion-reaction model for the degradation process of oil-well cements exposed to carbonated brines in the context of CO2 capture and storage in abandoned oil ...
    • Modelling acid attack of oilwell cement exposed to carbonated brine 

      Liaudat, Joaquín; Martínez Estévez, Ariadna; López Garello, Carlos María; Carol, Ignacio (John Gale, 2018-01)
      Article
      Open Access
      A diffusion-reaction model for the carbonation process of oilwell cement exposed to carbonated brine under CO2 geological storage conditions is presented. The formulation consists of two main diffusion/reaction field ...
    • Modelling acid attack of oilwell cement exposed to carbonated brine: effect of specimen geometry on experimental results 

      Barandiarán Villegas, Lucía Belén; Liaudat, Joaquín; López Garello, Carlos María; Carol, Ignacio (2019)
      Conference report
      Open Access
      In recent years, the authors and co-workers have developed a diffusion-reaction model for the degradation process of oilwell cements exposed to carbonated brines in the context of CO2 capture and storage in abandoned oil ...
    • Numerical and experimental study of ASR in concrete at the meso-level 

      Liaudat, Joaquín; López Garello, Carlos María; Carol, Ignacio (2016)
      Conference report
      Restricted access - publisher's policy
      In this paper, an ongoing research project on the mechanisms of concrete deterioration due to Alkali-Silica Reaction (ASR) is presented, together with some preliminary results. The research program includes both experimental ...
    • Numerical modelling of ASR expansions in concrete 

      Liaudat, Joaquín; Martínez Estévez, Ariadna; López Garello, Carlos María; Carol, Ignacio (American Society of Civil Engineers (ASCE), 2015)
      Conference report
      Restricted access - publisher's policy
      In the context of a project to characterize and model the Alkali-Silica Reaction in concrete, the results of a series of tests on specimens with a single interface between aggregate and cement paste, and the comparison to ...
    • Numerical modelling of the wedge splitting test in rock specimens, using fracture-based zero-thickness interface elements 

      Liaudat, Joaquín; Garolera Vinent, Daniel; Martínez Benasat, Antonio; Carol, Ignacio; Lakashmikhanta, Ramasesha; Alvarellos, J. (CIMNE, 2015)
      Conference lecture
      Open Access
      The purpose of the Wedge Splitting Test (WST) is to generate stable mode I fracture crack along a pre-established path, and be able to measure the specific fracture energy parameter of the material GFI. The test is performed ...
    • Recent developments in durability mesomechanics of concrete, including cracking via interface elements 

      Liaudat, Joaquín; Rodríguez, Mariana; López Garello, Carlos María; Carol, Ignacio (American Society of Civil Engineers (ASCE), 2013)
      Conference report
      Open Access
      The mesomechanical model for concrete previously developed for purely mechanical actions, is used as the basis for coupled durability mechanics calculations. Until now, the phenomena studied include drying shrinkage, ...
    • Zero-thickness interface model with chemical degradation by acid attack 

      Martínez, A.; López Garello, Carlos María; Carol, Ignacio; Liaudat, Joaquín (CIMNE, 2019)
      Conference report
      Open Access
      Carbon dioxide (CO2) storage in abandoned oil/gas reservoirs is considered a viable alternative to reduce greenhouse gas emissions to the atmosphere. An important element of the risk associated with long-term CO2 storage ...
    • Zero-thickness interface model with chemical degradation by acid attack 

      Martínez Estévez, Ariadna; Liaudat, Joaquín; López Garello, Carlos María; Carol, Ignacio (2019)
      Conference report
      Open Access
      Carbon dioxide (CO2) storage in abandoned oil/gas reservoirs is considered a viable alternative to reduce greenhouse gas emissions to the atmosphere. An important element of the risk associated with long-term CO2 storage ...