Exploració per tema "Concrete--Deterioration"

Ara es mostren els items 1-20 de 21

    • 3D-mesomechanical analysis of external sulfate attack in concrete 

      Pérez Carreras, Adrià; Riera Bayo, Celia; López Garello, Carlos María; Carol, Ignacio (2017)
      Text en actes de congrés
      Accés obert
      The present study focuses on degradation of concrete by external sulfate attack. The numerical model developed by the MECMAT/UPC group, incorporates coupled C-M analysis using a meso-mechanical approach with discrete ...

    • A strain-based plastic viscous-damage model for massive concrete structures 

      Faria, R; Oliver Olivella, Xavier; Cervera Ruiz, Miguel (1998-05)
      Article
      Accés obert
      Within the framework of continuum damage mechanics, a new constitutive damage model for massive concrete is presented, mainly intended for the seismic analysis of gravity and arch dams. Consistent with thermodynamic ...

    • 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
      Accés obert
      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 ...

    • Carbonation on ternary cement systems 

      Martínez Ramírez, Sagrario; Fernández Carrasco, Lucía (2012-05-01)
      Article
      Accés restringit per política de l'editorial
      The main hydration reaction product in the ternary system fly ash, calcium sulphate and calcium aluminate cement (40/20/40) at 20°C is a hydrated calcium sulfoaluminate compound, an AFt phase slightly different from ...

    • Coupled C-M meso-scale model for ASR expansion in concrete 

      Liaudat, Joaquín; López Garello, Carlos María; Carol, Ignacio (CRC Press/Balkema, 2018)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      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 ...

    • Criterios de intervención en forjados con viguetas de cemento aluminoso 

      Rosell Amigó, Juan Ramón; Casanovas Boixereu, Francesc X. (1992-12)
      Article
      Accés obert
      El artículo recoge la problemática referida a la seguridad estructural de 900.000 viviendas construidas con cemento aluminoso en el Estado Español, entre 1950 y 1970. Se plantean las dificultades que representa el actuar ...

    • Diffusion-reaction model for the internal sulfate attack in concrete 

      Campos, A.; López Garello, Carlos María; Aguado de Cea, Antonio (2016-01)
      Article
      Accés obert
      In the analysis of the behavior of concrete structures affected by expansive problems, it is often necessary to use kinetics models of the reactions involved to assess and predict the magnitude, distribution, and evolution ...

    • Effects of biaxial confinement in mortars exposed to external sulfate attack 

      Ikumi Montserrat, Tai; Segura Pérez, Ignacio; Pialarissi Cavalaro, Sergio Henrique (2019-01)
      Article
      Accés obert
      Research on external sulfate attack (ESA) is usually performed on small scale specimens under free expanding conditions. However, most field structures cannot expand freely due to confinement induced by the ground or other ...

    • Estudio experimental de las interfases árido-pasta afectadas por la reacción álcali-sílice 

      González Ruiz, Alejandro (Universitat Politècnica de Catalunya, 2012-06)
      Treball Final de Grau
      Accés restringit per acord de confidencialitat

    • Evolution of pyrrhotite oxidation in aggregates for concrete 

      Oliveira da Silva, Izelman; Pialarissi Cavalaro, Sergio Henrique; Aguado de Cea, Antonio (2014-11-17)
      Article
      Accés obert
      Rocks containing pyrrhotite bands are sometimes used to produce concrete. These rocks oxidize and produce long-term expansive reactions that damage concrete structures, leading to important economic and risk related ...

    • Experimental study of the effects of mechanical restraints on ASR expansions in concrete 

      Liaudat, Joaquín; López Garello, Carlos María; Carol, Ignacio (2021-03)
      Article
      Accés obert
      This paper summarizes an experimental campaign devoted to the study of the effect of (internal and external) mechanical restraints on Alkali-Silica Reaction (ASR) expansions in concrete made with sodalime (SL) glass as ...

    • Inlfuence [sic] of early sulfate exposure on the pore network development of mortars 

      Ikumi Montserrat, Tai; Segura Pérez, Ignacio; Pialarissi Cavalaro, Sergio Henrique (Elsevier, 2017-07)
      Article
      Accés obert
      The objective of this paper is to evaluate the influence of sulfate exposure on the pore network development of several Portland cement matrices. MIP, XRD and SEM analysis were performed at different ages in samples exposed ...

    • 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
      Accés obert
      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)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      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, ...

    • New results in 3D-mesomechanical coupled analysis of external sulphate attack in concrete 

      Biscaro, Caterina; Martínez Estévez, Ariadna; Pérez Carreras, Adrià; López Garello, Carlos María; Xotta, G.; Carol, Ignacio (International Centre for Numerical Methods in Engineering (CIMNE), 2021)
      Text en actes de congrés
      Accés obert
      External Sulphate Attack (ESA) is one of the main degradation processes affecting concrete structures. It takes place when the concrete is in an environment rich in sulphate ions and with a high humidity index. Once it has ...

    • Numerical and experimental study of ASR in concrete at the meso-level 

      Liaudat, Joaquín; López Garello, Carlos María; Carol, Ignacio (2016)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      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 assessment of external sulfate attack in concrete structures: a review 

      Ikumi Montserrat, Tai; Segura Pérez, Ignacio (2019-07)
      Article
      Accés obert
      The slow progress of the external sulfate attack and the large size and criticality of typical structures affected by this phenomenon establish numerical modeling as a key tool to assess the future evolution of concrete ...

    • Simplified analytical assessment of damage induced by the external sulphate attack in concrete piles 

      Ikumi Montserrat, Tai; Pialarissi Cavalaro, Sergio Henrique; Segura Pérez, Ignacio; Goodier, Chris; Austin, Simon (Springer, 2017)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      Underground structures and foundations, including piles, constructed with reinforced concrete may be in contact with sulphate-rich soils and water. Structural elements exposed to these conditions may be affected by an ...

    • Simplified methodology to evaluate the external sulfate attack in concrete structures 

      Ikumi Montserrat, Tai; Pialarissi Cavalaro, Sergio Henrique; Segura Pérez, Ignacio; Fuente Antequera, Albert de la; Aguado de Cea, Antonio (2016-01)
      Article
      Accés obert
      The external sulfate attack is a degradation process that causes expansion and cracking in concrete structures. Due to the absence of simplified methodologies to predict the potential damage, codes specify that sulfate ...

    • Simplified model to assess the durability of elements subjected to external sulphate attack: influence of shape and size of the elements 

      Ikumi Montserrat, Tai; Pialarissi Cavalaro, Sergio Henrique; Segura Pérez, Ignacio; Fuente Antequera, Albert de la; Aguado de Cea, Antonio (2016)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The mitigation of the external sulfate attack from the standpoint of the design of concrete structures is usually based on the use of cement with limited content of aluminates. Nevertheless, other parameters may affect the ...