Influence of precast foam on the pore structure and properties of fly ash-based geopolymer foams

Gu, Gonghui; Xu, Fang; Ruan, Shaoqin; Huang, Xiaoming; Zhu, Jing; Peng, Chao

doi:10.1016/j.conbuildmat.2020.119410

Cited by 64 publications

(17 citation statements)

References 38 publications

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“…However, as can be seen from numerous scientific studies, this is a challenging task due to the fact that foamed geopolymers are highly unstable even before curing. Beyond the standard possibilities of using foamed geopolymers as thermal insulation in construction [9,[23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41], they can be applied as hybrid organic-inorganic foams for the removal of metal ion contaminants from wastewater [24], making foam filters with the addition of lignocellulose from sawdust, and for the filtration of dyes and wastewater [42].…”

Section: Foaming Technology and Raw Materialsmentioning

confidence: 99%

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: Foaming Technology and Raw Materialsmentioning

confidence: 99%

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

Łach

2021

Materials

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“…Chi et al [30] and Ruan et al [31] reported that inclusion of bagasse ash in concrete triggered a significant amount of decrease in depth of penetration and water permeability. The use of bagasse ash as a construction material solves the environmental pollution and decreases the need of land requirement for dumping the waste bagasse ash [32]. Nowadays, bagasse is normally utilized as a main fuel in all sugar factories of Pakistan as well as in most of the sugar industries of the world.…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of bagasse ash for performance improvement of asphalt concrete pavements

Zia

Khan

2021

SN Appl. Sci.

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The performance of asphalt concrete pavements (ACP) is greatly related to the rate of rutting. Stone dust is mostly used as a filler in ACP. Bagasse ash being cementitious in nature, and costless waste can also be used as a filler. The overall aim is to select a suitable filler for better performance of asphalt concrete pavements. The effectiveness of locally available bagasse ash is examined as a filler for asphalt concrete in terms of its effect on job mix formula, stability, rutting depth, the rise in temperature, and cost of asphalt concrete. All tests are performed as per AASHTO standards. The bagasse ash asphalt concrete showed a reduction in rutting depth, temperature rise, and cost as compared to that of the stone dust asphalt concrete without disturbing the job mix formula. Hence, bagasse ash can be helpful for the performance enhancement of asphalt concrete pavements.

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“…Aerated concrete is developed and manufactured to improve the characteristics of cement/concrete, such as weight reduction, water permeability, and thermal insulation. The materials used for foaming are a foaming agent [ 11 , 12 , 13 , 14 ], metallic powder (Al, Zn) [ 15 , 16 , 17 ], or hydrogen peroxide (H 2 O 2 ) [ 18 , 19 , 20 , 21 ]. Aluminum powder (Al powder) is the most commonly used material for foaming, as mentioned in several previous studies [ 16 , 17 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Development and Characteristics of Aerated Alkali-Activated Slag Cement Mixed with Zinc Powder

2021

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Experiments on the development and properties of aerated concrete based on alkali-activated slag cement (AASC) and using Zn powder (ZP) as a gas agent were carried out. The experiments were designed for water-binding material (w/b) ratios of 0.35 and 0.45, curing temperatures of 23 ± 2 °C and 40 ± 2 °C, and ZP of 0.25%, 0.50%, 0.75%, and 1.0%. ZP generates hydrogen (H2) gas in AASC to form pores. At a w/b of 0.35, the curing temperature had little effect on the pore size by ZP. However, a w/b of 0.45 showed a clear correlation that the pore diameter increased as the curing temperature increased. The low w/b of 0.35 showed a small change in the pore size according to the curing temperature due to the faster setting time than 0.45 and the increased viscosity of the paste. Therefore, at a termination time exceeding at least 60 min and a w/b of 0.45 or more, it was possible to increase the size and expansion force of the pores formed by the ZP through the change of the curing temperature. ZP showed applicability to the manufacture of AASC-based aerated concrete, and the characteristics of foaming according to the curing temperature, w/b ratio, and ZP concentration were confirmed.

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Influence of precast foam on the pore structure and properties of fly ash-based geopolymer foams

Cited by 64 publications

References 38 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

Effectiveness of bagasse ash for performance improvement of asphalt concrete pavements

Development and Characteristics of Aerated Alkali-Activated Slag Cement Mixed with Zinc Powder

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