Design of lightweight metakaolin based geopolymer foamed with hydrogen peroxide

Petlitckaia, Svetlana; Poulesquen, Arnaud

doi:10.1016/j.ceramint.2018.10.021

Cited by 118 publications

(76 citation statements)

References 38 publications

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“…Indeed, Feng et al presented a study using hydrogen peroxide in order to create porosity in geopolymers (figure 3). 47 Moreover, other teams showed interest in geopolymers blown with H 2 O 2 as Petlichkaia et al 48 Recently Rao et al 49 presented a silica-alumina foam blown using hydrogen peroxide. Thus, gas production requires harsh conditions such as oxidizing agent and alkaline system that are not suitable for polymers and this blowing agent is limited to inorganic foams.…”

Section: ) Hydrogen Peroxidementioning

confidence: 99%

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From gas release to foam synthesis, the second breath of blowing agents

Coste

Négrell

Caillol

2020

European Polymer Journal

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The increasing concern about the environmental impact of physical blowing agents (PBAs) favours the use of chemical blowing agents (CBAs) to replace controversial PBAs. Blowing agents are key compounds in order to obtain polymer foams. Indeed, blowing agents are crucial additives that release gas needed to blow polymer foams. CBA compounds have been widely studied in recent decades, and today if new CBA are studied, one of the challenges remains to adapt the use of CBA to new polymers or new formulations. Only a handful of books present different CBAs commercially available but in these documents, the presentation of CBAs is not enough complete to understand potential or limits. Thus, our work is focused on the most common, both inorganic and organic chemical blowing agents and highlights the specifications of these CBAs, with their advantages and drawbacks, and finally presents promising perspectives.

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Section: ) Hydrogen Peroxidementioning

confidence: 99%

“…The reaction between hydrides and water is still in development in academic and industrial research teams but the focus is not necessary on foaming process. [47][48][49] Hydrides 650 H 2 -Metallic foams [50][51][52] (Al, Zn, Tin, etc. )…”

Section: Scheme 4: Reaction Between Magnesium Hydride and Watermentioning

confidence: 99%

From gas release to foam synthesis, the second breath of blowing agents

Coste

Négrell

Caillol

2020

European Polymer Journal

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“…It seemed that the geopolymer paste has penetrated into the rough surface of LWA. This implied that the rough surface of LWA could provide good adhesion between them [20,54] and responsible for the excellent mechanical performance of LWAGC. In the geopolymer mortar, some pores were noticed especially for LWAGC75.…”

Section: Thermal Conductivity (Tc)mentioning

confidence: 99%

“…On the other hand, foam concretes with high void space with or without aggregates can be produced with the addition of foam agent (e.g. hydrogen peroxide [19,20], aluminium powder [21] and sodium carbonate [22]) or preformed foam [23]. The presence of lightweight aggregate and foaming agent in geopolymer matrix introduces pores which affect markedly the density, porosity, mechanical strength and thermal conductivity of geopolymers.…”

mentioning

confidence: 99%

Compressive Strength and Thermal Conductivity of Fly Ash Geopolymer Concrete Incorporated with Lightweight Aggregate, Expanded Clay Aggregate and Foaming Agent

Yun-Ming¹,

Sandu²,

Cheng-Yong³

et al. 2019

Rev. Chim.

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This paper investigates the effect of incorporation of lightweight aggregate and foam in the preparation of lightweight aggregate geopolymer concrete (LWAGC) and lightweight aggregate foamed geopolymer concrete (LWAFGC). The geopolymer paste was formed by alkali activation of Class F fly ash in mixture of sodium silicate and sodium hydroxide solution. LWAGC was incorporated with expanded clay lightweight aggregate and river sand while hydrogen peroxide was added as foaming agent for LWAFGC. Results showed that LWAGC and LWAFGC achieved an excellent 28-day compressive strength of 60 MPa and 20 MPa, respectively. The bulk densities were 1815 kg/m3 for LWAGC and 1593 kg/m3 for LWAFGC. Even so, low thermal conductivity of 0.12 W/mK and 0.09 W/mK were reported. It was concluded that the joint effect of lightweight aggregate and foam produced geopolymer concrete with good mechanical strength while having excellent thermal insulating properties. The geopolymer concretes possessed high strength-to-density ratio to be regarded as lightweight high-performance structures.

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“…The production of geopolymer foams typically involves the addition of foaming agents (e.g., hydrogen peroxide (H 2 O 2 ), aluminium powders) to a geopolymer slurry [14,15]. Hydrogen peroxide is the most popular foaming agent, which can prepare more homogeneous geopolymer foams with volume ratio from 0.25% to 2.5% (volume of H 2 O 2 /volume of geopolymer slurry) [16]. However, hydrogen peroxide is thermodynamically unstable in basic media and is difficult to preserve over the long-term.…”

Section: Introductionmentioning

confidence: 99%

Fire Resistance of Alkali Activated Geopolymer Foams Produced from Metakaolin and Na2O2

Peng

Qin

et al. 2020

Materials

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This work aims to investigate the feasibility that alkali-based geopolymer foams produced from metakaolin and Na2O2 are applied for fire protection. Dry bulk density, porosity, mechanical strength, thermal conductivity, and fire resistance of the geopolymer foams are discussed as a function of the Na2O2 amounts. As Na2O2 content varies from 1% to 4%, dry bulk density, mechanical strength and thermal conductivity of the geopolymer foams approximately exhibit opposite trends with that of the porosity. At the later stage of the 3 h fire-resistance tests, the reverse-side temperatures of all tested samples were always maintained at 220–250 °C. Meanwhile, the amorphous skeleton structures have been converted to smooth ceramics during the high temperature processes, which is the main reason that the geopolymer foams possess a stable porous structure and excellent fire resistance. Therefore, we could conclude that alkali-activated geopolymer foams with extraordinary fire resistance have great potential for fire protection applications.

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Design of lightweight metakaolin based geopolymer foamed with hydrogen peroxide

Cited by 118 publications

References 38 publications

From gas release to foam synthesis, the second breath of blowing agents

From gas release to foam synthesis, the second breath of blowing agents

Compressive Strength and Thermal Conductivity of Fly Ash Geopolymer Concrete Incorporated with Lightweight Aggregate, Expanded Clay Aggregate and Foaming Agent

Fire Resistance of Alkali Activated Geopolymer Foams Produced from Metakaolin and Na2O2

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