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Influence of interface properties on fracture behaviour of concrete
Gangolu Appa Rao
Published in
2011
Volume: 36
   
Issue: 2
Pages: 193 - 208
Abstract
Hardened concrete is a three-phase composite consisting of cement paste, aggregate and interface between cement paste and aggregate. The interface in concrete plays a key role on the overall performance of concrete. The interface properties such as deformation, strength, fracture energy, stress intensity and its influence on stiffness and ductility of concrete have been investigated. The effect of composition of cement, surface characteristics of aggregate and type of loading have been studied. The load-deflection response is linear showing that the linear elastic fracture mechanics (LEFM) is applicable to characterize interface. The crack deformation increases with large rough aggregate surfaces. The strength of interface increases with the richness of concrete mix. The interface fracture energy increases as the roughness of the aggregate surface increases. The interface energy under mode II loading increases with the orientation of aggregate surface with the direction of loading. The chemical reaction between smooth aggregate surface and the cement paste seems to improve the interface energy. The ductility of concrete decreases as the surface area of the strong interface increases. The fracture toughness (stress intensity factor) of the interface seems to be very low, compared with hardened cement paste, mortar and concrete. © 2011 Indian Academy of Sciences.
About the journal
JournalSadhana - Academy Proceedings in Engineering Sciences
ISSN02562499
Open AccessYes
Concepts (29)
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    CEMENT PASTE
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    Concrete mix
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    CRACK DEFORMATION
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    Fracture behaviour
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    HARDENED CEMENT PASTE
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    HARDENED CONCRETE
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    INTERFACE ENERGY
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    INTERFACE FRACTURE ENERGY
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    INTERFACE PROPERTY
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    LINEAR-ELASTIC FRACTURE MECHANICS
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    LOAD-DEFLECTION RESPONSE
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    MODE II
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    STRESS INTENSITY
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    Surface area
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    Surface characteristics
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    THREE-PHASE COMPOSITES
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    Agglomeration
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    Aggregates
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    Brittle fracture
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    Cements
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    Deformation
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    Ductility
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    FRACTURE ENERGY
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    Fracture toughness
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    Hardening
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    Loading
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    Stiffness
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    Surface reactions
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    Phase interfaces