Comportamiento mecánico de hormigones de escoria activada alcalinamente reforzados con fibras de acero

Bernal, Susan A.; Gutiérrez, Ruby Mejía de; Rodríguez, Estefanía; Delvasto, Silvio; Puertas, Francisca

doi:10.3989/mc.2009.41807

Cited by 4 publications

(1 citation statement)

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“…Adding fibres to the brittle matrix improves the post-cracking behaviour of the composite material significantly as the fibres connect the crack edges after cracks are formed. The application of fibres is usually limited to plastic fibres to reduce effects resulting from the formation of shrinkage cracks, but steel fibres are also of special interest for the application in AAM [5]. Besides reducing the formation of shrinkage induced cracks, the bond behaviour between steel fibres and the surrounding AAM matrix is in some cases stronger than in OPC concretes [6].…”

Section: Introductionmentioning

confidence: 99%

Application of Steel Fibres in Alkali-Activated Mortars

Hüsken

Wagner

Gluth

et al. 2020

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Alkali-activated materials are ideal for the repair of concrete structures in harsh environmental conditions due to their high durability in chemically aggressive environments. However, slag-based mortars, in particular, are prone to shrinkage and associated cracks. In this respect, the application of steel fibres is one solution to reduce the formation of shrinkage induced cracks and to improve post cracking behaviour of these mortars. This study investigated the influence of two different types of steel fibres on the tensile properties of two alkali-activated mortars. Direct tensile tests and single fibre pull-outs were performed to analyse the determining failure modes both on macro and micro scale. Mechanical testing was accompanied by non-destructive testing methods such as digital image correlation and acoustic emission for a detailed analysis of the fracture process.

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Section: Introductionmentioning

confidence: 99%

Application of Steel Fibres in Alkali-Activated Mortars

Hüsken

Wagner

Gluth

et al. 2020

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Compressive and tensile behaviour of alkali‐activated slag‐based concrete incorporating single hooked‐end steel fibres

Rossi,

Patel,

Dehn

2023

ce papers

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The effect of single hooked‐end steel fibres, namely Dramix® 3D, on the mechanical performance of alkali‐activated slag‐based concrete (AASC) and Portland cement concrete (PCC) has been investigated. Compressive strength, modulus of elasticity, stress‐strain response under uniaxial compression and tension, splitting tensile strength and flexural strength have been evaluated. The experimental results show that AASC incorporating 3D fibres in a volume fraction of 0.75% exhibits an enhanced behaviour, under both compression and tension, in comparison to PCC incorporating the same fibre type and dosage. Although the reference mixes show similar compressive strength, 3D fibres enhance the modulus of elasticity, splitting tensile strength and flexural strength of AASC of 8.6%, 61.7% and 12.8%, respectively, while for PCC 1.1%, 42.2% and 16.1%, respectively. Three‐point bending tests show the effect of 3D fibres on the response of AASC and PCC under flexural loading. Although fibres have a limited effect on the strength corresponding to the limit of proportionality (LOP), they enhance the post‐peak behaviour, increasing the residual flexural strength and the material ductility. Finite element analysis has been performed to predict the flexural behaviour of steel fibre‐reinforced AASC (FRAASC) under flexural loading. The Concrete Damage Plasticity (CDP) model implemented in ABAQUS software can predict the flexural response of FRAASC quite accurately, although additional experimental data are needed to calibrate the model for different alkali‐activated matrix types.

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