Coupled Mechanical and Chemical Damage in Calcium Leached Cementitious Structures

Bellégo, Caroline Le; Pijaudier‐Cabot, Gilles; Gérard, Bruno; Dubé, Jean‐François; Molez, Laurent

doi:10.1061/(asce)0733-9399(2003)129:3(333)

Cited by 67 publications

(37 citation statements)

References 15 publications

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“…12; the same as for the case of chemical leaching coupled to mechanical damage ͑Le Bellégo et al 2003͒; this difference can be enlarged using the size effect law, that is when the extrapolation to specimens of larger and larger sizes is considered. A simple version of Bazant's size effect law is used ͑Bazant and Planas 1998͒.…”

Section: Residual Capacity Testsmentioning

confidence: 99%

Creep-Damage Coupled Effects: Experimental Investigation on Bending Beams with Various Sizes

Omar

Loukili

Pijaudier‐Cabot

et al. 2009

J. Mater. Civ. Eng.

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Abstract:The serviceability of concrete structures is a problem in which creep and damage are coupled. In this paper, we present experimental investigations on concrete that involve tertiary creep. We consider residual capacity tests on notched bending beams and investigate the evolution of size effect due to basic creep. In these experiments, beams are first subjected to a constant load, at a given ratio of the maximum capacity during 90 days. They are then loaded up to failure and their residual capacity is obtained. During the creep phase, acoustic emission is analyzed and it shows that damage develops under creep. The comparison between the size effect test results with and without creep exhibits variations of the fracture properties of the material. The fracture energy and the size of the fracture process zone decrease when creep occurs prior to failure. These results, which include size effect fracture tests, may serve for the development and validation of coupled creep-damage models.

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Section: Residual Capacity Testsmentioning

confidence: 99%

Creep-Damage Coupled Effects: Experimental Investigation on Bending Beams with Various Sizes

Omar

Loukili

Pijaudier‐Cabot

et al. 2009

J. Mater. Civ. Eng.

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“…Furthermore, the coupled chemo-mechanical deterioration has been modelled [13][14][15][16][17]. Kamali et al [18,19] recently presented a simplified model predicting the one-dimensional leaching kinetics from a large experimental database of cement pastes.…”

Section: Introductionmentioning

confidence: 99%

Decalcification of cement mortars: Characterisation and modelling

Segura

Molero²,

Aparicio³

et al. 2013

Cement and Concrete Composites

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a b s t r a c tThis paper presents the results of a thorough microstructural characterisation of a set of cement mortars (made with three w/b ratios and five different cement types), degraded by the ammonium nitrate method. Both destructive and ultrasonic non-destructive techniques were used to characterise the samples. The initial calcium content of the samples plays a dominant role in both the advance of the degradation process and the degradation grade of the samples. In addition, the decalcification process kinetics and the degradation grade are modelled, using Fick's second law of diffusion and the shrinking unreacted-core model. Two parametric equations are presented and used to estimate the decalcification process kinetics and the degradation grade using accessible microstructural parameters of the native mortars, such as the initial CaO content, the open porosity, and the cementitious matrix volume fraction. Furthermore, the degraded depth in the samples is measured using ultrasonic testing with an average error of about 10%.

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“…Three sizes for the notched beams have been considered with a constant depth b (=10cm) and the following characteristical dimension d per size (Fig.3): D 1 = 10 cm, D 2 = 20 cm and D 3 = 40 cm. A Levenberg-Marquardt optimization algorithm has been applied to get a set of parameters for both nonlocal method (Le Bellégo et al 2003) by minimizing the functional (p) defined in Eq.13.…”

Section: Presentation Of the Experiments And Model Parameters Identifmentioning

confidence: 99%

Non-local model and global-local cracking analysis for the study of size effect

Giry¹,

Oliver-Leblond²,

Kishta³

2014

Computational Modelling of Concrete Structures

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The problematic of size effect for quasi-brittle materials and more particularly for concrete has been widely studied during the last decades. Several approaches have been proposed to describe and explain why the strength decreases as the size increases. Indeed, the capacity of a model to describe the size effect matters greatly when dealing with the modelling of structures. A study of size effect is proposed in this article by considering several notched concrete beams submitted to a three points bending test. To describe the nonlinear behavior of concrete, two different nonlocal regularization methods (the original method and a method proposed recently by one of the authors) are compared to analytical model and to experimental results available in the literature in order to assess their capacity to describe size effect at the global scale as well as at the local scale. More particularly, a quantification of the crack field is obtained by using a discrete elements reanalysis method proposed recently by two of the authors. This last analysis brings an additional element to discriminate or not model capacity to describe size effect of quasi-brittle materials.

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Coupled Mechanical and Chemical Damage in Calcium Leached Cementitious Structures

Cited by 67 publications

References 15 publications

Creep-Damage Coupled Effects: Experimental Investigation on Bending Beams with Various Sizes

Creep-Damage Coupled Effects: Experimental Investigation on Bending Beams with Various Sizes

Decalcification of cement mortars: Characterisation and modelling

Non-local model and global-local cracking analysis for the study of size effect

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