Effect of hydrogen peroxide and bagasse ash additions on thermal conductivity and thermal resistance of geopolymer foams

Pantongsuk, Thammaros; Kittisayarm, Pakamon; Muenglue, Nisarat; Benjawan, Sireethorn; Thavorniti, Parjaree; Tippayasam, Chayanee; Nilpairach, Siriphan; Heness, Greg; Chaysuwan, Duangrudee

doi:10.1016/j.mtcomm.2021.102149

Cited by 18 publications

(10 citation statements)

References 42 publications

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“…Many authors of works have divergent opinions on this subject. The most reasonable approach seems to be in line with the results of the LCA authors that geopolymeric binders have a similar impact on the natural environment as traditionally used binders [82,83].…”

Section: Forecast and Summarymentioning

confidence: 56%

Geopolymer Foams—Will They Ever Become a Viable Alternative to Popular Insulation Materials?—A Critical Opinion

Łach

2021

Materials

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Over the last several years, there has been a large increase in interest in geopolymer materials, which are usually produced from waste materials, and their applications. The possibilities of application of geopolymers seem to be unlimited, and they are used in almost all fields of technology. Their use as insulation materials appears promising due to their complete nonflammability and excellent strength. However, one limitation is their complex manufacturing process and lack of stability of the obtained geopolymer foams as well as difficulties in achieving such good insulation properties possessed by polyurethane foams, polystyrene, and wool. Hundreds of studies have already been performed on insulating geopolymer foams and various types of foaming agents, and their authors reported that foamed insulating geopolymers had a density starting from 200 kg/m3 and thermal conductivity from 0.04 W/mK. However, the repeatability of the obtained results on an industrial scale is questionable. It is still a challenge to obtain a geopolymer material with comparable properties as conventional insulation materials and to overcome the barriers associated with the successful implementation of geopolymer material as insulation in buildings and other applications on a mass scale. This paper provides a comprehensive review of the methods used for the production of foamed geopolymers and the best parameters obtained, as well as a summary of the most important information reported in the scientific literature. It also presents the results of a critical analysis of the feasibility of implementing this technology for mass deployment. In addition, the problems and limitations that are most often encountered with the implementation of geopolymer technology are discussed.

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Section: Forecast and Summarymentioning

confidence: 56%

Geopolymer Foams—Will They Ever Become a Viable Alternative to Popular Insulation Materials?—A Critical Opinion

Łach

2021

Materials

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“…This material is also referred to as foam concrete, which by definition is a cellular concrete with a large number of hollow spaces, with or without the addition of aggregate [ 9 ]. They have good thermal insulation and acoustic properties [ 10 , 11 , 12 , 13 ] as well as mechanical properties, although their compressive strength is lower than that of solid (not foamed) geopolymers [ 10 , 14 ]. The comparison of fire-resistant properties of geopolymers and other materials is shown in Figure 1 [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

“…The following materials can be used as foaming agents: aluminum powder, sodium hypochlorite, silica dust, and hydrogen peroxide. These agents react with alkaline activators to create pores in the geopolymer structure [ 10 , 12 , 15 ]. In the case of aluminum powder, voids are formed according to the following hydrogen release reaction [ 16 , 17 , 18 , 19 , 20 ]: 2Al + 2OH − + 6H 2 O » 2[Al(OH) 4 ] − + 3H 2 …”

Section: Introductionmentioning

confidence: 99%

Determination of the Influence of Hydraulic Additives on the Foaming Process and Stability of the Produced Geopolymer Foams

et al. 2021

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The research described in this article was aimed at determining the influence of hydraulic additives on the foaming process and the stability of the produced geopolymer foams. These foams can be used as insulation materials to replace the currently commonly used insulations such as expanded polystyrene or polyurethane foams. Geopolymers have low thermal conductivity, excellent fire- and heat-resistant properties, and have fairly good mechanical properties. Research on foamed materials shows that they have the highest class of fire resistance; therefore, they are most often used as insulation products in construction. Geopolymer foams were made of aluminosilicate materials (fly ash) and foaming agents (H2O2 and Al powder), and the stabilizers were gypsum and portland cement. Additionally, surfactants were also used. It was found that better foaming effects were obtained for H2O2—it is a better foaming agent for geopolymers than Al powder. When using a hydraulic additive—a stabilizer in the form of cement—lower densities and better insulation parameters were obtained than when using gypsum. Portland cement is a better stabilizer than gypsum (calcium sulfates), although the effect may change due to the addition of surfactants, for example.

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“…The high alkalinity catalyzed the hydrogen peroxide decomposition [19], and the solution of sodium silicate is known to stabilize the decomposition reaction through decreasing and slowing down the reaction [18].…”

Section: H2o2 → H2o + ½ O2mentioning

confidence: 99%

Taguchi- Grey relational analysis for Optimizing the Compressive Strength and Porosity of Metakaolin-Based Geopolymer

Al-Dujaili

2021

IJE

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Effect of hydrogen peroxide and bagasse ash additions on thermal conductivity and thermal resistance of geopolymer foams

Cited by 18 publications

References 42 publications

Geopolymer Foams—Will They Ever Become a Viable Alternative to Popular Insulation Materials?—A Critical Opinion

Geopolymer Foams—Will They Ever Become a Viable Alternative to Popular Insulation Materials?—A Critical Opinion

Determination of the Influence of Hydraulic Additives on the Foaming Process and Stability of the Produced Geopolymer Foams

Taguchi- Grey relational analysis for Optimizing the Compressive Strength and Porosity of Metakaolin-Based Geopolymer

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