Investigating the synergistic effect of graphene nanoplatelets and fly ash on the mechanical properties and microstructure of calcium aluminate cement composites

Win, Thwe Thwe; Prasittisopin, Lapyote; Jongvivatsakul, Pitcha; Likitlersuang, Suched

doi:10.1016/j.jobe.2023.107710

Cited by 5 publications

(3 citation statements)

References 39 publications

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“…As shown in Equations (7)-(10), when a heated sample of hydrated CAC breaks down, chemically bound water is released from its different aluminate hydrates. This investigation reveals that AH 3 releases the bound water at 250 • C, and the C 3 AH 6 phase releases the bound water at 300 • C. These findings can also be found elsewhere[20,[46][47][48].…”

supporting

confidence: 76%

Effects of Fly Ash Composition to Mitigate Conversion of Calcium Aluminate Cement Composites

Win,

Panwisawas,

Jongvivatsakul

et al. 2023

Buildings

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Calcium aluminate cement (CAC) is one of the alternative cements that is widely used for special applications. However, during the hydration process degradation of CAC microstructure, the so-called hydrate conversion process, hexagonal calcium aluminate hydrate (CAH10) transforms into a cubic (C3AH6) phase, resulting in increased porosity and reduced strengths. It is known that alternative means for stabilizing the CAC conversion are conducted by introducing fly ash (FA) in CAC, where its microstructure is attributed to aluminosilicates. However, no study has yet been conducted on different FA compositions influencing CAC performance. This study aims to evaluate the effects of different compositions of FA on CACs’ fresh and hardened characteristics. Results revealed that the microstructure was denser when CAC was mixed with FA. Regarding reactivity, CAC with calcium-rich FA systems is 13% faster than the silica-rich one. The higher the density and the lower the porosity of calcium-rich FA mixtures were found compared with silica-rich FA in both micro- and macro-structures. As seen in the microscopic structure, this is due to the calcium-rich phase formation.

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supporting

confidence: 76%

Effects of Fly Ash Composition to Mitigate Conversion of Calcium Aluminate Cement Composites

Win,

Panwisawas,

Jongvivatsakul

et al. 2023

Buildings

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“…Some ashes are defined as a latent hydraulic material or so-called pozzolan, which does not possess (pure) hydraulic properties, but they need an activator (such as CaO and/or Ca (OH) 2 ) to react with water and to form hydration products, identical to those formed during the cement hydration [29,30]. The degree of latent hydraulic activity of individual ashes varies.…”

Section: (Latent Hydraulic) Reactivity Of Ashesmentioning

confidence: 99%

Recycling of Different Incineration Ashes in the Construction Sector: Perspectives from Slovenia

Zalar Serjun

2024

Sustainability

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The EU prioritizes transitioning to a circular economy, aiming to boost sustainable resource management through policies promoting recycling and reuse, benefiting both the environment and the economy. Many successful case studies demonstrate using various incineration waste by-products (ashes) as substitutes for natural materials, yielding environmental advantages and showcasing sustainable resource management practices. While extensive literature covers ash characterization and applications, the direct links between the properties of the main components, the amorphous phase, and research findings remain elusive. Analysis predominantly centers on microstructural phase development, influencing mechanical, physical, and chemical properties and guiding research interpretations. Existing standards for ash use primarily address coal-derived fly ash, with SIST EN 13282-2 allowing alternative sources like circulating fluidized bed and paper sludge incineration residues. Yet, beyond this standard, no regulations mandate using different ash types. Nonetheless, the applicability of ashes for the geotechnical composite materials has already been confirmed in the field since numerous geotechnical projects have been carried out in Slovenia. Such composites have been recognized as beneficial practices, and the majority of them also possess legal permission for usage according to the Slovenian Technical Approvals. Given the varying value and complexity of ashes, detailed characterization before use is crucial. Assessing the recycling potential of different ashes requires a precise definition of basic properties such as microstructure, minerals, and chemical composition. Emphasis should be placed on characterizing the hydraulic properties and gaining detailed insights into the amorphous phase, ensuring informed decision-making regarding their recycling processes.

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“…The debonding of SSW particles and the formation of voids were identified as key mechanisms that influence the strength of the concrete. This suggests that the presence and distribution of SSW particles should be carefully controlled to optimize the material's performance under temperature exposure (Adamu et al, 2021(Adamu et al, , 2022Win et al, 2023).…”

Section: Microstructural Analysismentioning

confidence: 99%

Post-fire behavior of geopolymer concrete with sodium silicate waste as an alternative to conventional river sand

Kanagaraj,

Anand,

Alengaram

et al. 2023

JSFE

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Purpose The present work focuses on evaluating the physical and mechanical characteristics of geopolymer concrete (GPC) by replacing the sodium silicate waste (SSW) in place of traditional river sand. The aim is to create eco-friendly concrete that mitigates the depletion of conventional river sand and conserves natural resources. Additionally, the study seeks to explore how the moisture content of filler materials affects the performance of GPC.Design/methodology/approach SSW obtained from the sodium silicate industry was used as filler material in the production of GPC, which was cured at ambient temperature. Instead of the typical conventional river sand, SSW was substituted at 25 and 50% of its weight. Three distinct moisture conditions were applied to both river sand and SSW. These conditions were classified as oven dry (OD), air dry (AD) and saturated surface dry (SSD).Findings As the proportion of SSW increased, there was a decrease in the slump of the GPC. The setting time was significantly affected by the higher percentage of SSW. The presence of angular-shaped SSW particles notably improved the compressive strength of GPC when replacing a portion of the river sand with SSW. When exposed to elevated temperatures, the performance of the GPC with SSW exhibited similar behavior to that of the mix containing conventional river sand, but it demonstrated a lower residual strength following exposure to elevated temperatures.Originality/value Exploring the possible utilization of SSW as a substitute for river sand in GPC, and its effects on the performance of the proposed mix. Analyzing, how varying moisture conditions affect the performance of GPC containing SSW. Evaluating the response of the GPC with SSW exposed to elevated temperatures in contrast to conventional river sand.

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Investigating the synergistic effect of graphene nanoplatelets and fly ash on the mechanical properties and microstructure of calcium aluminate cement composites

Cited by 5 publications

References 39 publications

Effects of Fly Ash Composition to Mitigate Conversion of Calcium Aluminate Cement Composites

Effects of Fly Ash Composition to Mitigate Conversion of Calcium Aluminate Cement Composites

Recycling of Different Incineration Ashes in the Construction Sector: Perspectives from Slovenia

Post-fire behavior of geopolymer concrete with sodium silicate waste as an alternative to conventional river sand

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