Modelling and experimental study of low temperature energy storage reactor using cementitious material

Ndiaye, Khadim; Ginestet, Stéphane; Cyr, Martin

doi:10.1016/j.applthermaleng.2016.08.157

Cited by 22 publications

(3 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Porous structure modification might have an impact on the thermomechanical properties and will be discussed later. Controlling the porous structure may also be very interesting for other applications such as filtration [42] or energy storage systems [43,44]. This is a new result because FCs presented in the literature were produced with constant surfactant content, their porous structure usually being controlled by H 2 O 2 content or paste rheology.…”

Section: Porous Structurementioning

confidence: 99%

Thermomechanical performance of blended metakaolin-GGBS alkali-activated foam concrete

Samson

Cyr

Gao

2017

Construction and Building Materials

Self Cite

View full text Add to dashboard Cite

This study aims to synthetize, at ambient temperature, blended metakaolin-ground granulated blast furnace slag (MK-GGBS) foam concrete (FC) presenting good thermomechanical performance for use as self-bearing insulation material. First, a binder composition that could be used for MK-GGBS FC production was identified. Fourteen paste formulations were produced and analysed to determine the best proportions of MK, GGBS and activator to be used in an alkali-activated material (AAM) FC matrix. Certain requirements were specified for the fresh paste (initial setting time > 180 minutes) and solid materials (high compressive strength and moderate shrinkage) to be used for FC production. The optimized mix was then employed for AAM FC production by using an H 2 O 2 blowing agent (gasfoaming method). The influence of two main parameters (H 2 O 2 and surfactant contents) on AAM FC properties (density, porous structure, thermal conductivity and compressive strength) were investigated. The thermomechanical performances of the AAM FCs produced were good compared to FC performances found in the literature. FC density mostly depends on H 2 O 2 content. The FC porous structure depends strongly on both H 2 O 2 and surfactant contents. High surfactant content FCs have a thin homogenous porous structure. At constant density, FC compressive strength depends on the surfactant content. An optimized surfactant content maximizing FC compressive strength at constant density was identified. Highlights  Optimized proportions between metakaolin, GGBS and activator were identified.  H 2 O 2 gas-off lasts 180 minutes. AAMs paste initial setting time must start after.  Lightweight AAMs were obtained with density from 264 to 480 kg/m 3.  The foam concrete porous structure depends on both H 2 O 2 and surfactant contents.  An optimized surfactant content (0.004%) maximized FC compressive strength.

show abstract

Section: Porous Structurementioning

confidence: 99%

Thermomechanical performance of blended metakaolin-GGBS alkali-activated foam concrete

Samson

Cyr

Gao

2017

Construction and Building Materials

Self Cite

View full text Add to dashboard Cite

show abstract

“…This dehydration process is associated with a high enthalpy of 600-800 J/g [173,175,176] and is reversible. Thus hydrated CSA cements are suggested as a suitable material for seasonal heat storage [144,173,175,[177][178][179].…”

Section: Effect Of W/c Ratio and Temperaturementioning

confidence: 99%

Advances in understanding ye'elimite-rich cements

Haha

Winnefeld²,

Pisch³

2019

Cement and Concrete Research

110

View full text Add to dashboard Cite

In this review, we discuss the recent advances in understanding ye'elimite-rich cements. These cements can be classified as follows:(1) low belite one namely called calcium sulphoaluminate cements (CSA) where the main use is in special applications or when combined with OPC and calcium sulphate sources in structural application (2) High belite one namely Belite Ye'elimite ferrite cement (BYF) where their development as an alternative low carbon binders is aimed to replace Portland clinker in structural applications.The main hydrating phase at early age in both systems is ye'elimite. Its formation, its reactivity and its extent of reaction and space filling when hydrating define the properties of the cement. Recent advances in understanding these properties are critically analyzed.Recent activities on the clinker formation and production at laboratory and industrial scale are reported. Additionally, the effects of aluminates rich minerals are reviewed in detail, with a focus on their influence on the hydration mechanism and the resulting hydrates assemblage and its stability in ye'elimite rich systems. Applicability of thermodynamic calculation and its limitations are discussed to underline the role of the environment at each reaction step on the hydrates assemblage.

show abstract

“…With geopolymer, the mechanisms leading to matrix setting are very different but an overdose of surfactant may impede the geopolymerization process. Controlling the GFC porous structure may also be very interesting for other applications such as energy storage systems (Ndiaye, Ginestet, & Cyr, 2017) or filtration (Strozi Cilla, Colombo, & Raymundo Morelli, 2014). Table 6.…”

Section: Porous Structurementioning

confidence: 99%

Porous structure optimisation of flash-calcined metakaolin/fly ash geopolymer foam concrete

Samson

Cyr

2017

European Journal of Environmental and Civil Engineering

Self Cite

View full text Add to dashboard Cite

This study reports the production and characterization of geopolymer foam concrete (GFC). This material is foreseen for use as a self-bearing insulation material. In order to identify an optimal paste composition, eight mixtures were made and are presented in a ternary diagram (dry extract of alkaline solution, flash-calcined metakaolin (MK) and fly ash (FA)). The characterization of these pastes (initial setting time (IST), shrinkage and compressive strength) indicated an optimal composition corresponding to 25% of activator, 62.5% of MK and 12.5% of FA. The GFCs were then produced by inserting variable amounts of H2O2 (1, 1.5 and 2%) into the geopolymer paste. The fresh GFC porous structure was stabilized with surfactant. The GFCs produced had low densities (225 < ρ < 506 kg/m 3) associated with low thermal conductivities (0.07 < λ < 0.12 W/(m.K)) and acceptable compressive strength (0.5 < Rc < 1.85 MPa, for samples cured at 20°C). A significant influence of the surfactant content on the porous structure was demonstrated. The lower surfactant content led to a porous structure made of larger bubbles separated by wider matrix walls promoting GFC compressive strength.

show abstract

Modelling and experimental study of low temperature energy storage reactor using cementitious material

Cited by 22 publications

References 24 publications

Thermomechanical performance of blended metakaolin-GGBS alkali-activated foam concrete

Thermomechanical performance of blended metakaolin-GGBS alkali-activated foam concrete

Advances in understanding ye'elimite-rich cements

Porous structure optimisation of flash-calcined metakaolin/fly ash geopolymer foam concrete

Contact Info

Product

Resources

About