Potassium geopolymer foams made with silica fume pore forming agent for thermal insulation

Henon, Joseph; Alzina, Arnaud; Absi, Joseph; Smith, David Stanley; Rossignol, Sylvie

doi:10.1007/s10934-012-9572-3

Cited by 86 publications

(39 citation statements)

References 23 publications

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“…Besides, Feng et al used a similar amount of H2O2 in a fly ash-based geopolymer, obtaining comparable results in terms of density and thermal conductivity (335 kg/cm 3 and 0.082 W/mK, respectively) and a slightly higher compressive strength of 0.96 MPa [33]. As previously discussed, in the material investigated here The thermal conductivity of the material, calculated as the average on three samples, was of 0.073 W/mK at 30 • C for an average bulk density of 313 kg/m 3 , a value in line with previous studies on alkali activated foams [18,32,33,38] and lower than other lightweight inorganic materials for thermal insulation such as aerated concrete [39,40]. As evidenced from many literature studies, the thermal conductivity of a porous material mainly relates with its density, a parameter which in turn is determined by different factors such as the solid/liquid ratio, the curing temperature, the addition of surfactants/foaming agents and the raw materials used [9,17,21,32,33].…”

Section: Thermal Propertiessupporting

confidence: 90%

Porous Geopolymer Insulating Core from a Metakaolin/Biomass Ash Composite

et al. 2017

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Ashes derived from the combustion of vegetal and animal biomass still represent a mostly unexplored secondary raw material for the production of alkali-activated materials, given their peculiar chemical nature. In this work, calcium phosphate biomass ashes were successfully used as partially reactive fillers in a metakaolin-based geopolymer composite to produce, by direct foaming, sustainable and lightweight boards with thermal insulating properties. The investigated materials were obtained by activating a blend of metakaolin and biomass ash in a weight ratio of 1: 1 and foamed with the addition of H 2 O 2 in measure of 5 wt. %, to maximize the volume of disposed ash and ensure adequate properties to the material at the same time. The obtained geopolymer composite was characterized by microstructural, chemical-physical, mechanical and thermal analysis: the obtained results showed that biomass ash and metakaolin well integrated in the microstructure of the final porous material, which was characterized by a density of about 310 kg/m 3 and a thermal conductivity of 0.073 W/mK at a mean test temperature of 30 • C, coupled with an acceptable compressive strength of about 0.6 MPa. Dilatometric and thermogravimetric analysis, performed up to 1000 • C, highlighted the thermal stability of the composite, which could be regarded as a promising material for low-cost, self-bearing thermal insulating partitions or lightweight cores for thermostructural sandwich panels.

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Section: Thermal Propertiessupporting

confidence: 90%

Porous Geopolymer Insulating Core from a Metakaolin/Biomass Ash Composite

et al. 2017

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“…In addition, according to Temuujin et al [98], geopolymers are capable of anti-ultraviolet and antiaging, which made them suitable as coating for exterior wall building to conserve energy. The studies on the thermal and fire performance of geopolymers have also been reported elsewhere [81,[99][100][101]. As mentioned earlier, geopolymers have molecular structures to resemble zeolitic materials.…”

Section: Applications Of Geopolymersmentioning

confidence: 89%

Clay-Based Materials in Geopolymer Technology

Abdullah¹,

Yun-Ming²,

Cheng-Yong³

et al. 2018

Cement Based Materials

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The term "geopolymer" was introduced by Davidovits in the 1970s. The prefix "geo" was selected to symbolize the constitutive relationship of the binders to geological materials, natural stone and/or minerals. Geopolymer is mineral polymers of inorganic polymer glasses with structure resembling natural zeolitic materials. Previously, geopolymer formation used source materials such as clay (e.g. kaolin and calcined kaolin) or industrial by-product (e.g. slag and fly ash). The precursor material plays an important role in the formation of geopolymer. The source material provides silicon (Si) and aluminum (Al) for reaction by an alkali activator solution. The Si and Al contents in the source materials dissolve in the alkaline activator solution and then polymerize to form a polymeric Si-O-Al-O framework which becomes the binder. Geopolymeric materials are attractive because of their excellent mechanical properties; durability and thermal stability can also be achieved. Owing to their low calcium content, they are more resistant to acid attack than materials based on Portland cement. In addition, they are of great interest because of the reduced energy requirement for their manufacture and the higher sustainability. Recently the search for alternative low cost and easily available materials led among others to Clay. Clay generally consists of a mixture of different clay minerals and associated minerals, which are strongly affected by the nature of the parent rocks. These materials are extensively distributed over the surface of the world and may show certain reactivity after a thermal activation process shows a great potential to be utilized in geopolymer technology. This article presents the potential of different types of clay as the source materials for geopolymerization reaction in terms of morphological properties. Moreover, the mechanical and microstructural properties of geopolymer made with various kinds of clay and its potential application are also presented.The aluminosilicate sources are materials rich in alumina and silica content (e.g. ashes [11][12][13][14], clays [15,16] or slag [17,18]). Some other natural and artificial silicoaluminates such as zeolite [19] and magnesium-contained minerals [20] have also been used as an important source of Si 4+ and Al 4+ ions in the geopolymer binding system. Normally, the total composition of Al 2 O 3 and SiO 2 is more than 70%, preferable in reactive amorphous phase [3,21]. In this book chapter, the utilization of clay or clay minerals in geopolymer formation is discussed. Kaolin/kaoliniteKaolinite is the most common clay mineral used in geopolymer synthesis. It has 1:1 uncharged dioctahedral layer structure (Figure 2a) whereby the layers are (Si 2 O 5 ) n 2− sheet and the Al(OH) 3 (gibbsite) sheet linked by sharing oxygen atoms. The layers are held together by weak van der waals and hydrogen bonds leading to the layered structure (Figure 2b). Figure 2. Structure of kaolinite (above) and microstructure of kaolinite (below) [22]. Clay-Based Materials in Geopolymer ...

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“…e main challenge on inorganic insulation materials' development is related to the production of a high porous material with sufficient mechanical properties. Geopolymer foams can be produced by the introduction of foaming agents such as hydrogen peroxide [18][19][20][21], metal powders [22][23][24], or silica fumes [25][26][27]. eir foaming action is due to the oxygen or hydrogen formation in alkaline conditions according to the following reactions:…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Porous Fly Ash‐Based Geopolymers Using Si as Foaming Agent

Kioupis

Kavakakis

Tsivilis

et al. 2018

Advances in Materials Science and Engineering

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is paper concerns the synthesis of foamed geopolymers using fly ash and metallic Si as the binder and the porogent agent, respectively. e Taguchi approach was applied in order to study the effect of some significant synthesis parameters such as the Si foaming agent content (% w/w fly ash based), the alkali type (R : Na or K), and the alkalinity (R/Al molar ratio) of the activation solution on the compressive strength and apparent density of the foamed geopolymers. e final products were characterized by means of XRD, FTIR, and SEM, while optical microscopy was applied for the evaluation of the porosity. Lightweight geopolymers with a compressive strength of 2.08-14.88 ΜPa and an apparent density of 0.84-1.55 g/cm 3 were prepared by introducing a Si content up to 0.2% w/w on fly ash basis.

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Potassium geopolymer foams made with silica fume pore forming agent for thermal insulation

Cited by 86 publications

References 23 publications

Porous Geopolymer Insulating Core from a Metakaolin/Biomass Ash Composite

Porous Geopolymer Insulating Core from a Metakaolin/Biomass Ash Composite

Clay-Based Materials in Geopolymer Technology

Synthesis and Characterization of Porous Fly Ash‐Based Geopolymers Using Si as Foaming Agent

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