Fiber-Matrix Bond Characteristics of Alkali-Activated Slag Cement–Based Composites

Beglarigale, Ahsanollah; Aydın, Serdar; Kızılırmak, Cengiz

doi:10.1061/(asce)mt.1943-5533.0001642

Cited by 17 publications

(8 citation statements)

References 22 publications

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“…The incorporation of fibres as the primary reinforcement for slag-based polymers, regardless of fibre type, aims to provide higher resistance to crack formation and expansion to overcome this weakness directly [21–24,35,37,39–41,43,44]. The following mechanism can explain this phenomenon: When the specimen is subjected to a bending load, the tensile stress is caused by the bending moment at the interface between the fibre and the matrix into shear stress and through the interface with the matrix bonding and friction to offset [40,41,45,47]. This contact effect is not only in the interface of the two components but also in the far away from the interface so that the joint action of the fibre and the matrix forms a kind of ring area, thereby increasing the load-bearing capacity of the interface [45].…”

Section: Resultsmentioning

confidence: 99%

“…The following mechanism can explain this phenomenon: When the specimen is subjected to a bending load, the tensile stress is caused by the bending moment at the interface between the fibre and the matrix into shear stress and through the interface with the matrix bonding and friction to offset [40,41,45,47]. This contact effect is not only in the interface of the two components but also in the far away from the interface so that the joint action of the fibre and the matrix forms a kind of ring area, thereby increasing the load-bearing capacity of the interface [45]. Next, due to the inherent shrinkage properties of AASC, a significant volume change occurs in the matrix.…”

Section: Effects Of the Various Fibre Types And Contents On The Flexu...mentioning

confidence: 99%

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Influences on the mechanical and physical properties of hot-press moulding alkali-activated slag (HP-FRAASC) composite with various fibers

Wang,

Xu,

Zang

et al. 2023

Advances in Applied Ceramics: Structural, Functional and Biocer

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In this study, we will apply the hot-press moulding method for the first time to the preparation of alkali-activated slag composites (AASC) and incorporate 1vol.-%, 3vol.-%, 5vol.-%, and 7vol.-% steel, copper, and carbon fibres into the matrix in order to investigate the characteristics of the HP-AASC and fibre reinforced (HP-FRAASC) in terms of compressive strength, flexural strength, impact toughness, and bulk density of HP-AASC and HP-FRAASC. Results show that the composites have good flexural strength, compressive strength, and impact toughness when the content of steel fibres is 5 vol.-%, copper fibres are 7 vol.-%, and carbon fibres are 1-3 vol.-%. It was observed from each sample of HP-FRAASC and HP-AASC that the HP-AASC samples had lower porosity, better density, and an easy preparation process, which can be used as a suitable preparation method for this material.

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Section: Resultsmentioning

confidence: 99%

Section: Effects Of the Various Fibre Types And Contents On The Flexu...mentioning

confidence: 99%

Influences on the mechanical and physical properties of hot-press moulding alkali-activated slag (HP-FRAASC) composite with various fibers

Wang,

Xu,

Zang

et al. 2023

Advances in Applied Ceramics: Structural, Functional and Biocer

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“…Like the compressive strength and the modulus of elasticity, the higher value of splitting tensile strength of AASC-3D75 in comparison to PCC-3D75 can be linked to the higher shrinkage of the alkali-activated matrix in comparison to traditional cement-based concrete. The compressive stresses around the fibres developed by the matrix undergoing shrinkage enhances the fibre-matrix bond [11] and allows for an early activation of the fibres bridging the shrinkage-induced micro-cracking.…”

Section: Compressive Stress-strain Response Under Uniaxial Loadingmentioning

confidence: 99%

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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“…Keeping all these parameters constant in the preparation of composite materials, the nature of the reinforcement, basalt fibers, or cellulose fibers in this work, together with the volume or weight fraction (percent) and their aspect ratio, are accounted as effective parameters during the consolidation process. A large number of different types of fibers has already been investigated from the following slag-based inorganic binders: polyethylene fibers [ 17 , 18 , 19 ]; polyvinyl alcohol (PVA) fibers [ 20 ]; carbon fibers [ 21 ]; steel [ 22 , 23 , 24 , 25 ] and alkali-resistant glass fibers [ 26 ], or other functionalizing components [ 27 ]. Since the insertion of the reinforcement is expected to improve the mechanical performance of the matrix, or binder, the majority of the published studies present results that are related to the performance and fracture toughness of these composites.…”

Section: Introductionmentioning

confidence: 99%

“…Only recently [ 17 , 18 , 19 ], some studies are more dedicated to the self-healing properties of alkali-activated slag-based composites, where, in NaOH or Na-silicate activated CaO–(Na 2 O)–Al 2 O 3 –SiO 2 –H 2 O (C–(N)–A–S–H) matrices, CaCO 3 and some amount of Na 2 CO 3 were formed in the fractured areas. Concerning steel-reinforced AASC [ 22 ], it was proved that high-performance fiber-reinforced composites, with respect to Portland cement ones, can be prepared, owing to the alkali-activated matrix, which has superior adherence to steel fiber. The problem that arises due to the high drying shrinkage of AASC, in the fiber–matrix transition zone, can be eliminated by incorporating pozzolans.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Fibrous Reinforcement on the Polycondensation Degree of Slag-Based Alkali Activated Composites

et al. 2021

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Alternative cementitious binders, based on industrial side streams, characterized by a low carbon footprint, are profitably proposed to partially replace Portland cement. Among these alternatives, alkali-activated materials have attracted attention as a promising cementitious binder. In this paper, the chemical stability of the matrix, in fiber-reinforced slag-based alkali-activated composites, was studied, in order to assess any possible effect of the presence of the reinforcement on the chemistry of polycondensation. For this purpose, organic fiber, cellulose, and an inorganic fiber, basalt, were chosen, showing a different behavior in the alkaline media that was used to activate the slag fine powders. The novelty of the paper is the study of consolidation by means of chemical measurements, more than from the mechanical point of view. The evaluation of the chemical behavior of the starting slag in NaOH, indeed, was preparatory to the understanding of the consolidation degree in the alkali-activated composites. The reactivity of alkali-activated composites was studied in water (integrity test, normed leaching test, pH and ionic conductivity), and acids (leaching in acetic acid and HCl attack). The presence of fibers does not favor nor hinder the geopolymerization process, even if an increase in the ionic conductivity in samples containing fibers leads to the hypothesis that samples with fibers are less consolidated, or that fiber dissolution contributes to the conductivity values. The amorphous fraction was enriched in silicon after HCl attack, but the structure was not completely dissolved, and the presence of an amorphous phase is confirmed (C–S–H gel). Basalt fibers partly dissolved in the alkaline environment, leading to the formation of a C–N–A–S–H gel surrounding the fibers. In contrast, cellulose fiber remained stable in both acidic and alkaline conditions.

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Fiber-Matrix Bond Characteristics of Alkali-Activated Slag Cement–Based Composites

Cited by 17 publications

References 22 publications

Influences on the mechanical and physical properties of hot-press moulding alkali-activated slag (HP-FRAASC) composite with various fibers

Influences on the mechanical and physical properties of hot-press moulding alkali-activated slag (HP-FRAASC) composite with various fibers

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

The Effect of Fibrous Reinforcement on the Polycondensation Degree of Slag-Based Alkali Activated Composites

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