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HomeSolid State PhenomenaSolid State Phenomena Vol. 254A Study of Mode III Fracture Toughness in Young...

A Study of Mode III Fracture Toughness in Young and Mature Concrete with Fly Ash Additive

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Abstract:

A description of processes of formation and propagation of cracks in material requires the knowledge of all fracture mechanics parameters, i.e.: K_Ic, K_IIcand K_IIIc. In this study a new testing method and estimation of the fracture toughness in Mode III (antiplane shear) of concretes containing: 0, 20 and 30% volume content of the class F fly ash (FA) was proposed. Fracture toughness tests were performed on axial torsion machine MTS 809 Axial/Torsional Test System. The studies examined effect of FA additive on the parameter K_IIIc_. In order to determine the fracture toughness K_IIIca special device was made. Experimental investigation under third mode fracture was carried out both in young and mature concrete composites (after: 3, 7, 28, 90, 180 and 365 days). 20% addition of FA as well as a 30% addition of FA causes a reduction in fracture toughness of young concrete. After 28 days of couring a significant increase of the K_IIIc was noticed in composites with a 20% additive of FA while concrete mixtures with a higher additive of FA still had lower analyzed fracture mechanics parameter.

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Advanced Materials and Structures VI

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Periodical:

Solid State Phenomena (Volume 254)

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120-125

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https://doi.org/10.4028/www.scientific.net/SSP.254.120

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Online since:

August 2016

Authors:

Grzegorz Ludwik Golewski*, Tomasz Sadowski

Keywords:

Fly Ash, Fracture Toughness, Mature Concrete, Mode III Fracture, Young Concrete

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© 2016 Trans Tech Publications Ltd. All Rights Reserved

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