A review of thermomechanical properties of lightweight concrete

Samson, Gabriel; Phelipot-Mardelé, Annabelle; Lanos, Christophe

doi:10.1680/jmacr.16.00324

Cited by 72 publications

(33 citation statements)

References 69 publications

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“…Adding surfactant tended to decrease the FC density, meaning that some air was already entrained and stabilized through the paste during mixing. Some FC were produced by quick mixing [12,40] of a paste that contained a high amount of surfactant (mix-foaming method). However, the pre-foaming method is usually preferred to the mix-foaming method because it requires less surfactant and is easier to set up on a construction site [41].…”

Section: Densitymentioning

confidence: 99%

“…Thus, using high surfactant content seems to be appropriate to produce FC with good thermal insulation ability. In a recent paper, Samson et al [40] presented the thermomechanical performance of classic lightweight concrete (lightweight aggregate concrete and FC). Classic FC was FC produced with binder that was not alkaliactivated (cement, gypsum, etc.).…”

Section: Thermal Conductivitymentioning

confidence: 99%

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

Samson

Cyr

Gao

2017

Construction and Building Materials

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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.

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Section: Densitymentioning

confidence: 99%

Section: Thermal Conductivitymentioning

confidence: 99%

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

Samson

Cyr

Gao

2017

Construction and Building Materials

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“…Concrete is one of ubiquitous materials in the building industry [16][17][18]. There is a high demand in the use of concrete due to its low cost [16,17,19]. Recent reports show more than 26.8 billion tons of normal concrete are manufactured yearly [17,20].…”

Section: Embodied Energy In Materials and Building Typementioning

confidence: 99%

Assessment on Embodied Energy of Non-Load Bearing Walls for Office Buildings

2020

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Two important factors that have been put in the limelight in the current age are environmental concerns and sustainable future. The building sector has emerged as an important player in this matter due to their contribution into the large share of resources and energy consumption as well as harmful greenhouse gas emission. This paper discusses the percentage of embodied energy (EE) in two common building wall materials in Malaysia: steel and concrete. Concrete is used in concrete non-load bearing walls and steel is used to manufacture curtain walls. Although there are more materials used in the selected case studies, steel and concrete possess the high amount of embodied energy. Thus, the concrete wall and curtain wall in the lifecycle analysis (LCA) pre-use phase in high-rise office buildings in Malaysia are considered in this research. GaBi software is used to evaluate and calculate embodied energy in the case studies. The functional unit for this LCA study is determined as one cubic meter of concrete non-load bearing wall and curtain wall. In order to determine the components included in the analysis, input-output flowcharts are created for each process. The comparison of these walls shows that curtain wall has more embodied energy than concrete. The highest amount of embodied energy in curtain wall construction for case B is 4873.89 MJ, and for the case A is 4851.09 MJ approximately. The amount of EE in the concrete non-load bearing wall for both case studies are the lowest amount, with 278.85 MJ for case A and 280.66 MJ for case B. Results also show that the manufacturing of materials is the biggest contribution to the amount of EE at more than 50%, whereas transportation is between 1.83% and 3.77% only.

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“…Some materials are used to ensure bearing properties (concrete wall or blocks) and low conductivity materials are added to ensure thermal insulation. However, during recent decades, foam concrete (FC) has appeared as a serious alternative to classical multilayer envelopes as these materials can have both self-bearing and thermal insulation properties (Samson, Phelipot-Mardelé, & Lanos, 2016a). FCs are often referred to as aerated concrete.…”

Section: Introductionmentioning

confidence: 99%

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

Samson

Cyr

2017

European Journal of Environmental and Civil Engineering

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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.

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A review of thermomechanical properties of lightweight concrete

Cited by 72 publications

References 69 publications

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

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

Assessment on Embodied Energy of Non-Load Bearing Walls for Office Buildings

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

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