Attempts to Improve the Subsurface Properties of Horizontally-Formed Cementitious Composites Using Tin(II) Fluoride Nanoparticles

Krzywiński, Kamil; Sadowski, Łukasz; Szymanowski, J.; Żak, Andrzej; Piechówka-Mielnik, Magdalena

doi:10.3390/coatings10010083

Cited by 9 publications

(5 citation statements)

References 27 publications

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“…Thus, the weakening of the bonds increases the porosity and decreases the strength of the composites. Additionally, recent studies proved the usefulness of microstructural analysis of cement-based materials [9,58,59]. The findings for the double binder of cement and both 5% and 10% wood-ash in Figure 4A,B show a reduction in porosity due to wood-ash replacement.…”

Section: Influence Of Porosity/binder Index On Unconfined Compressive Strengthmentioning

confidence: 76%

“…Thus, the weakening of the bonds increases the porosity and decreases the strength of the composites. Additionally, recent studies proved the usefulness of microstructural analysis of cement-based materials [9,58,59]. Consoli et al [60], influenced by ba et al [61], established a general model via normalizing their results by dividing the established power equations to a particular value of strength.…”

Section: Influence Of Porosity/binder Index On Unconfined Compressive Strengthmentioning

confidence: 99%

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Strength, Stiffness, and Microstructure of Wood-Ash Stabilized Marine Clay

2020

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The world’s population is growing at a rapid pace, thus increasing the need for shelter, which, because of increased carbon emissions, is making our planet less habitable. Thus, supplementary cementitious materials (SCMs) are used to reduce the embodied carbon emissions in the building sector. Wood-ash, as a replacement for cement in ground improvement, seems to be a promising material. In this study, we considered the strength, stiffness, and microstructural behavior of marine deposited clays of Cyprus treated with cement and wood-ash as a cement replacement. Since clay is abundant in nature, it could help stabilize waste to improve the mechanical behavior of produced composites. Portland cement (7%, 10%, and 13%) was replaced with various amount of wood-ash (5% and 10%) with two different dry densities (1400 and 1600 kg/m3) and three distinct curing periods (7, 28, and 60 days). Unconfined compressive strength (UCS), direct shear, porosity and pulse velocity tests were performed. Additionally, X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy analysis (EDX) were performed for microstructural evaluation of clay–wood-ash–cement mixtures. The results revealed that the replacement of cement with 5% of wood-ash yielded superior performance. The microstructure investigation of wood-ash–cement–clay blends further showed the formation of a densified matrix with stable bonds. Furthermore, the porosity and strength properties (unconfined compressive strength, splitting tensile strength, cohesion (C) and friction angle (ϕ)) of blends have unique relationships with porosity and binder contents, which were further confirmed by other supplementary materials and soils.

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Section: Influence Of Porosity/binder Index On Unconfined Compressive Strengthmentioning

confidence: 76%

“…Thus, the weakening of the bonds increases the porosity and decreases the strength of the composites. Additionally, recent studies proved the usefulness of microstructural analysis of cement-based materials [9,58,59]. Consoli et al [60], influenced by ba et al [61], established a general model via normalizing their results by dividing the established power equations to a particular value of strength.…”

Section: Influence Of Porosity/binder Index On Unconfined Compressive Strengthmentioning

confidence: 99%

Strength, Stiffness, and Microstructure of Wood-Ash Stabilized Marine Clay

2020

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Section: Influence Of Porosity/binder Index On Unconfined Compressive Strengthmentioning

confidence: 99%

Strength, Stiffness, and Microstructure of Wood Ash Stabilized Marine Clay

Ekinci¹,

Hanafi²,

Aydın³

2020

Preprint

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The world’s population is growing at a rapid pace, thus increasing the need for shelter, which, because of increased carbon emissions, is making our planet less inhabitable. Thus, supplementary cementitious materials (SCMs) are used to reduce the embodied carbon emissions in the building sector. Wood ash, as a replacement for cement in soil treatment, seems to be a promising material. In this study, we considered the strength, stiffness, and microstructural behavior of marine clay treated with cement and wood ash as a cement replacement. Since clay is abundant in nature, it could help stabilize waste to improve the mechanical behavior of produced composites. Portland cement (7%, 10%, and 13%) was replaced with various amount of wood ash (5% and 10%) with two different dry densities (1400 and 1600 kg/m3) and three distinct curing periods (7, 28, and 60 days). Unconfined compressive strength, direct shear, porosity, pulse velocity, x-ray diffraction, and scanning electron microscopy tests were performed on selected specimens to evaluate the structural and microstructural effect of clay–wood ash–cement interaction. The results revealed that the replacement of cement with 5% of wood ash yielded superior performance. The microstructure investigation of wood ash–cement–clay blends further showed the formation of a densified matrix with stable bonds. Furthermore, the porosity and strength properties of blends developed unique relationships, which were further confirmed by other supplementary materials and soils.

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“…The combination of cement/lime with nano-materials forms a pozzolanic environment during the hydration of lime/cement and soil. Nano-materials react chemically with cement and lime to form hydrated compounds (calcium-silicate and calcium-aluminate hydrates, CSH/CAH) [48][49][50][51] and, therefore, contribute to improvement in the shear strength of the soil and, hence, reduction in lime/cement consumption [51][52][53][54][55][56]. Gallagher and Mitchell (2002) investigated the triaxial shear strength of loose sand stabilized with 5%, 10%, 15%, and 20% silica colloids [57].…”

Section: Introductionmentioning

confidence: 99%

Effect of Nano-Additives on the Strength and Durability Characteristics of Marl

et al. 2021

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Low bearing capacity soils may pose serious construction concerns such as reduced bearing capacity and excessive hydro-associated volume changes. Proper soil remediation techniques must be planned and implemented before commencing any construction on low bearing capacity soils. Environmentally friendly soil stabilizers are gradually replacing traditional soil stabilizers with high carbon dioxide emissions such as lime and cement. This study investigated the use of an alternative pozzolanic mix of nano-additives (i.e., nano-silica and nano-alumina) and cement to reduce the usage of cement for achieving competent soil stabilization outcomes. A series of unconfined compressive strength (UCS), direct shear, and durability tests were conducted on marl specimens cured for 1, 7, and 28 days stabilized with nano-additives (0.1~1.5%), 3% cement, and combined 3% cement and nano-additives. The UCS and shear strength of stabilized marl increased with nano-additives up to a threshold nano-additive content of 1% which was further intensified with curing time. Nano-additive treated cemented marl specimens showed long durability under the water, while the cemented marl decomposed early. The microfabric inspection of stabilized marl specimens showed significant growth of calcium silicate hydrate (CSH) products within the micro fabric of nano-silica treated marl with reduced pore-spaces within aggregated particles. The results confirmed that nano-additives can replace cement partially to achieve multi-fold improvement in the strength characteristics of the marl.

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Attempts to Improve the Subsurface Properties of Horizontally-Formed Cementitious Composites Using Tin(II) Fluoride Nanoparticles

Cited by 9 publications

References 27 publications

Strength, Stiffness, and Microstructure of Wood-Ash Stabilized Marine Clay

Strength, Stiffness, and Microstructure of Wood-Ash Stabilized Marine Clay

Strength, Stiffness, and Microstructure of Wood Ash Stabilized Marine Clay

Effect of Nano-Additives on the Strength and Durability Characteristics of Marl

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