Influence of composite materials confinement on alkali aggregate expansion

Mohamed, Ismail; Curtil, Laurence; Ronel, S.; Hamelin, P.

doi:10.1007/bf02479306

Cited by 7 publications

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“…

In this paper, we are going to present a serie of compressive tests that were carried out in order to investigate the mechanical behaviour during alkali aggregate attack at different ageing periods.

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confidence: 99%

“…In a previous study [6], we have presented an original experimental procedure for results expansion alcali aggregate reaction. Our main goal is to identify the influence of the confinement by composite materials on alkali-aggregate expansion.…”

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confidence: 99%

“…Résumé Dans une première partie [6], nous avons exposé nos travaux sur un protocole expérimental original qui nous a permis d'obtenir des résultats d'expansion d'un béton alcali réactif, tout en identifiant l'influence d'un confinement par matériaux composites sur le gonflement dûà l'alcali-réaction.…”

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Influence of composite materials confinement on alkali-aggregate mechanical behaviour

2006

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In a previous study [6], we have presented an original experimental procedure for results expansion alcali aggregate reaction. Our main goal is to identify the influence of the confinement by composite materials on alkali-aggregate expansion.In this paper, we are going to present a serie of compressive tests that were carried out in order to investigate the mechanical behaviour during alkali aggregate attack at different ageing periods. We also evaluate the influence of composite material confinement on the mechanical characteristics of these concretes. This will be demonstrated in this second part.The specimens used for expansion were loaded in compression until they fractured at four successive stages in the ageing process.Our results show a significant increasein the mechanical characteristics of the confined alkali reactive specimens in comparison withthe non confined specimens: the confined specimens not only withstand compressive stresses four to five times as high as nonconfined ones, but their stress/strain curves follow a 'linear evolution' whereas non-confined specimens seem to behave like powdery materials. Our experiments show that the increase in strength is much more I. Mohamed · S. Ronel · L. Curtil Laboratoire Mécanique Matériaux Structure (L2MS) -Université Claude Bernard Lyon I, 82, bd Niels Bohr Domaine Scientifique de la Doua, 69622 Villeurbanne Cedex, France important with this kind of alkali aggregate concrete confined by composite materials. Résumé Dans une première partie [6], nous avons exposé nos travaux sur un protocole expérimental original qui nous a permis d'obtenir des résultats d'expansion d'un béton alcali réactif, tout en identifiant l'influence d'un confinement par matériaux composites sur le gonflement dûà l'alcali-réaction.En parallèle, nous avons mené une campagne d'essais de compression afin d'étudier le comportement mécanique d'un béton alcali-réactifà différents stades de vieillissement et surtout d'évaluer l'influence des matériaux composites sur les caractéristiques mécaniques de tels bétons. Ceci fait l'objet de cette deuxième partie. Leséprouvettes ayant servi pour l'expansion ontété chargées en compression jusqu'à ruptureà quatreétapes temporelles successives. Nos résultats montrent un gain notable sur les caractéristiques mécaniques deséprouvettes alcaliréactives confinées par rapportà celles non confinées : non seulement, les confinées supportent des contraintes de compression 4à 5 fois supérieuresà celles ne l'étant pas, mais leurs courbes contraintesdéformations suivent une "évolution linéaire" alors que les non confinées semblent se comporter comme un matériau pulvérulent. Le gain en résistance est important et l'apport du confinement par matériaux composites est net.

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“…

In this paper, we are going to present a serie of compressive tests that were carried out in order to investigate the mechanical behaviour during alkali aggregate attack at different ageing periods.

…”

mentioning

confidence: 99%

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confidence: 99%

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Influence of composite materials confinement on alkali-aggregate mechanical behaviour

2006

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“…The confinement of standard cylinders or prisms affected by AAR with carbon fibre reinforced polymer (CFRP) has been studied by several researchers (Qian et al, 2001;Curtil et al, 2003;Wigum, 2003;Mohamed et al, 2005;Mohamed et al,2006;Pelletier and Labossière, 2007), and others have used this material on flexural and compression concrete members (Fujii et al, 1996;Lacasse et al, 2003;Abdullah et al, 2010;Shayan et al, 2012). The following sub-sections focus on the effectiveness of CFRP use for confining affected concrete columns to restrain AAR-induced expansion and enhance the strength and strain capacities.…”

Section: Introductionmentioning

confidence: 99%

“…The effect of unidirectional CFRP as a composite material to confine 12 concrete cylinders 160mm in diameter and 320 mm in length was investigated by Mohamed et al (2005). Six samples were reactive and six nonreactive.…”

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Effect of CFRP Confinement on AAR-Induced Expansion of Concrete Columns

Kubat

Al-Mahaidi

Shayan

2017

juod

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The effect of the alkali-aggregate reaction (AAR) in concrete, which has an adverse effect on its durability. In order to extend concrete'service life-span it is necessary to find a novel material to reduce or limit AAR-induced expansion and improve the strength capacity of the affected concrete. Carbon fibre reinforced polymers (CFRPs) are one of several materials used to rehabilitate affected concrete members. Twenty circular concrete columns 200 mm in diameter and 500 mm in height were cast from reactive (AAR) concrete. During six months of storage at 38º C and 98% relative humidity, several ages of 15, 30, 45, 60, 90 and 120 days after casting to represent different levels of expansion during AAR development were selected to confine the affected columns using CFRP composites. Strain behaviour in concrete and steel were monitored, before and after confinement, for different wrapping times. The results indicate the efficiency of using CFRP to reduce the rate of expansion in both steel and concrete. The results show also show that the efficiency of reducing AAR-induced expansion depends on the time of wrapping and the number of CFRP layers applied to the affected columns.

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Effects of uniaxial stress on alkali–silica reaction induced expansion of concrete

Dunant

Scrivener

2012

Cement and Concrete Research

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Influence of composite materials confinement on alkali aggregate expansion

Cited by 7 publications

References 6 publications

Influence of composite materials confinement on alkali-aggregate mechanical behaviour

Influence of composite materials confinement on alkali-aggregate mechanical behaviour

Effect of CFRP Confinement on AAR-Induced Expansion of Concrete Columns

Effects of uniaxial stress on alkali–silica reaction induced expansion of concrete

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