High-porosity geopolymer foams with tailored porosity for thermal insulation and wastewater treatment

Bai, Chengying; Franchin, Giorgia; Elsayed, Hamada; Zaggia, Alessandro; Conte, L.; Li, Hongqiang; Colombo, Paolo

doi:10.1557/jmr.2017.127

Cited by 125 publications

(63 citation statements)

References 44 publications

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“…7d and 7e). Such final structure might represent an important characteristic for applications as thermal insulators or sound absorbing materials [18]. The sawdust fiber found on the geopolymer structure, as shown in Fig.…”

Section: Resultsmentioning

confidence: 96%

Effect of sawdust as porosity agent on final properties of geopolymers

2019

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leading to materials with good mechanical properties. Time and temperature of curing of geopolymers also present a direct impact on the final mechanical properties of the material. Those parameters have been explored in many studies ranging from 20 to 85 °C and from 1 to 28 days [12, 13] depending on the prepared formulation. In addition, relative humidity has also been controlled in some studies [13]. All parameters as density, porosity and mechanical properties of the geopolymer play an important role for the final application. Hence, a control and evaluation of parameters are required according to the desired application, and then an improvement in acoustic and thermal comfort, for example, in civil construction might also be explored. This work showed the development of geopolymers, the evaluation of temperature of sintering and the effect of the addition of sawdust on final properties, always aiming

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Section: Resultsmentioning

confidence: 96%

Effect of sawdust as porosity agent on final properties of geopolymers

2019

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“…This can make them unsuitable for some applications. To solve this problem, stabilizing agents such as surfactants, fibers, and particles can be used for addition into the geopolymer slurry to decrease the surface tension of the gas/slurry system [20,21]. Surfactants such as Triton X 100 [22], Tween 80 [21], protein [23], and vegetable oil [16,24] are classified in the hydrophilic group and are used for this purpose.…”

Section: Introductionmentioning

confidence: 99%

Synergistic effect of animal oil or butter and hydrogen peroxide on physical and mechanical properties of porous alumino-siliceous materials

Lertcumfu¹,

Kaewapai²,

Jaita³

et al. 2020

ScienceAsia

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Porous alumino-siliceous (PAS) materials are attractive for use in a wide variety of construction and adsorption materials. In the present study, the porous alumino-siliceous materials were synthesized by a geopolymerization method in a reaction from ceramic waste, metakaolin, and an alkaline solution, H 2 O 2 (as a foaming agent) and either pork lard or butter (surfactants). Different amounts of the surfactants (2.5-15 wt%) were added to the samples. The pore shape in the PAS materials was affected by the type of surfactant used. PAS materials with small open pores and high porosity were successfully fabricated with butter as a surfactant. The compressive strength value trend was related to total porosity. The relationship between compressive strength and porosity was found to be consistent with a model proposed by Ryshkewitch. The results suggest that this material can be used as a foam material.

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“…Several surfactants do not allow foaming of such a solution, see Steol (anionic) or Tween and Triton (nonionic) for example. Note that such surfactants are sometimes used for foaming purpose with geopolymer solutions[6,7,[18][19][20][21][22]. Note also that precipitates were sometimes observed (Tween 80 and SDS).…”

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confidence: 99%

A physical approach towards controlling the microstructure of metakaolin-based geopolymer foams

Kaddami

Pitois

2019

Cement and Concrete Research

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Geopolymer foams are promising sustainable lightweight materials combining insulation efficiency with interesting mechanical and fire resistance properties. Controlling their pore size remains challenging because intrinsic foam aging processes act before hardening. We highlight a physical approach to counteracting aging processes in fresh geopolymer foams and to maintaining the pore morphology that has been set initially by mixing metakaolin suspension with precursor aqueous foam. More precisely, it is shown that arrest of foam aging can be achieved if solid particle concentration in the suspension is larger than a critical value which is proved to depend on both bubble size and gas volume fraction. This behavior is understood through the jamming transition occurring for the metakaolin suspension when confined in the foam network, providing significant solid elasticity against bubble motions. The general significance of the reported result makes it useful, as a complement to chemical formulation, for designing morphology-controlled geopolymer foams.

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High-porosity geopolymer foams with tailored porosity for thermal insulation and wastewater treatment

Abstract: Abstract

Cited by 125 publications

References 44 publications

Effect of sawdust as porosity agent on final properties of geopolymers

Effect of sawdust as porosity agent on final properties of geopolymers

Synergistic effect of animal oil or butter and hydrogen peroxide on physical and mechanical properties of porous alumino-siliceous materials

A physical approach towards controlling the microstructure of metakaolin-based geopolymer foams

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