Mechanical performance of fiber-reinforced alkali activated un-calcined earth-based composites

Ojo, Emeso B.; Bello, Kabirat O.; Ngasoh, Odette F.; Stanislas, Tido Tiwa; Mustapha, Kabiru; Savastano, Holmer; Soboyejo, W. O.

doi:10.1016/j.conbuildmat.2020.118588

Cited by 17 publications

(13 citation statements)

References 32 publications

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“…This series of parallel cracks formed in the specimen leads to failure in a multiple crack mode which explains the highest flexural strength values reported in Figure 4. Similar trends were also reported previously 36,37 …”

Section: Resultssupporting

confidence: 92%

“…Similar trends were also reported previously. 36,37 3.1.3 | High-temperature exposure Figure 6 shows the effect of high-temperature exposure on the compressive strength of mortar specimens. The compressive strength in control specimens lost about 70% of its strength after exposure, which could be due to the pressure that occurred as a result of free water movement, and also due to the phase changes in the aluminosilicate binder.…”

Section: Flexural Strengthmentioning

confidence: 99%

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Effect of fiber type and content on the mechanical properties and shrinkage characteristics of alkali‐activated kaolin

Matalkah

Ababneh

Aqel

2021

Structural Concrete

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An experimental study was carried out to evaluate the effect of several fibers on the mechanical properties, drying shrinkage, and microstructural characteristics of alkali‐activated kaolin binders. Four different types of fibers were evaluated in this study: polypropylene (PP) fiber, discontinuous structural synthetic (DSS) fiber, brass‐coated steel (BCS) fiber, and hooked steel (HS) fiber. The fibers were added to the alkali‐activated kaolin at a volume fraction of 0%, 0.5%, 1%, and 1.5%. The experimental results revealed that the compressive strength of alkali‐activated binder increased by about 60% when 1% of PP fiber is added, whereas the addition of HS fiber substantially enhanced the flexural strength (more than 200% when 1.5% fiber volume content is added). BCS and HS fibers were found to more effective compared to PP and DSS fibers in maintaining the binder integrity prior to high temperatures exposure. All fiber‐reinforced alkali‐activated composites yielded lower drying shrinkage (≤450 microstrains), where HS fiber was found to effectively prevent the shrinkage of the binder (≤60 microstrains). The microstructural investigation revealed good interfacial bonding between the alkali‐activated binder and the fibers.

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Section: Resultssupporting

confidence: 92%

Section: Flexural Strengthmentioning

confidence: 99%

Effect of fiber type and content on the mechanical properties and shrinkage characteristics of alkali‐activated kaolin

Matalkah

Ababneh

Aqel

2021

Structural Concrete

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“…Under small-scale bridging conditions (the length of the bridging zone is very small compared to specimen dimensions). 53 For SSB conditions, the toughening due to crack bridging is given by 51 :…”

Section: Crack Bridging Modelmentioning

confidence: 99%

“…Small scale bridging corresponds to bridging lengths that are less than 0.5 mm 51 while large scale bridging typically corresponds to bridging lengths that are greater than 0.5 mm. In the small‐scale bridging regime, an idealized elastic–plastic spring model, proposed originally by Budiansky et al, 52 crack bridging can be simulated using a series of distributed springs that are connected to crack faces.…”

Section: Theorymentioning

confidence: 99%

“…Under small‐scale bridging conditions (the length of the bridging zone is very small compared to specimen dimensions) 53 . For SSB conditions, the toughening due to crack bridging is given by 51 :

∆ K_{italicSSB} = \sqrt{\frac{2}{π} α V_{f} \int_{0}^{L} \frac{σ_{Y}}{\sqrt{X}} dx},

where

∆ K_{italicSSB}

is toughening due to SSB, a is the constraint/triaxiality factor,

V_{f}

is the volume fraction of the nanoparticle, L is the length of the bridging ligament,

σ_{y}

are the uniaxial yield stress and x corresponds to the distance from the crack tip.…”

Section: Theorymentioning

confidence: 99%

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Mechanical and thermal properties of polydimethylsiloxane/magnetite nanocomposites for cancer treatment by localized hyperthermia and photothermal ablation

Onyekanne

Oyewole

Salifu

et al. 2022

J of Applied Polymer Sci

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A combination of experiments and theoretical models is used to study the mechanical and thermal properties of polydimethylsiloxane (PDMS) and magnetite nanoparticle‐reinforced PDMS composites with the potential for applications in biomedical implants for localized hyperthermia and photothermal ablation. Composite samples with varying weight fractions (0,1, 5, and 10 wt.%) of Fe3O4 nanoparticles were fabricated and tested to determine their stress–strain behavior and fracture toughness. The measured mechanical properties are also compared with predictions from composite and toughening models. The implications of the results are discussed for the design of plasmonic/magnetic nanocomposites with attractive combinations of mechanical and thermal properties that are relevant to laser hyperthermia and photo‐thermal‐ablation.

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New approach for assessing uniaxial compressive strength of rocks using measurement from nanoindentation experiments

Komadja

Stanislas

Munganyinka

et al. 2022

Bull Eng Geol Environ

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Mechanical performance of fiber-reinforced alkali activated un-calcined earth-based composites

Cited by 17 publications

References 32 publications

Effect of fiber type and content on the mechanical properties and shrinkage characteristics of alkali‐activated kaolin

Effect of fiber type and content on the mechanical properties and shrinkage characteristics of alkali‐activated kaolin

Mechanical and thermal properties of polydimethylsiloxane/magnetite nanocomposites for cancer treatment by localized hyperthermia and photothermal ablation

New approach for assessing uniaxial compressive strength of rocks using measurement from nanoindentation experiments

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