Investigation on pore properties, thermal conductivity, and compressive behavior of fly ash/slag‐based geopolymer foam

Geopolymer foam has emerged as a promising inorganic porous material in the last decade. Despite of the numerous advantages, there are some pending issues to be addressed, on top of that is the low compressive strength. To overcome this, this study synthesizes a high‐strength geopolymer foam by the...

Full description

Saved in:
Bibliographic Details
Published in:International journal of applied ceramic technology 2023-11, Vol.20 (6), p.3517-3534
Main Authors: Zhou, Huafei, Xu, Zhechen, Xie, Ziling, Hong, Hengda
Format: Article
Language:English
Subjects:
Compressive properties
Compressive strength
Fly ash
Fourier transforms
Geopolymers
GGBS
Granulation
Heat conductivity
Heat transfer
Infrared analysis
Microstructure
Pore size distribution
Porosity
Porous materials
Slag
Thermal conductivity
Thermal insulation
Water absorption
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Geopolymer foam has emerged as a promising inorganic porous material in the last decade. Despite of the numerous advantages, there are some pending issues to be addressed, on top of that is the low compressive strength. To overcome this, this study synthesizes a high‐strength geopolymer foam by the partial substitution of fly ash (FA) with ground granulated blast furnace slag and carries out an intensive investigation into its microstructure, pore properties, thermal conductivity as well as compressive behavior. The microstructure is firstly analyzed by X‐ray diffraction and Fourier transform infrared spectroscopy techniques. The pore characteristics are also scrutinized, including pore size distribution, total porosity and water absorption. Then, the thermal conductivity is investigated and the applicability of basic effective thermal conductivity models to characterize the relationship with total porosity is evaluated. Afterward, the compressive strength together with the softening coefficient is examined, and the relationship with total porosity is also studied. Finally, comparisons between the proposed geopolymer foam and other FA‐based geopolymer foams in the literature are performed. The results show that the proposed geopolymer foam possesses not only a comparable thermal conductivity but also a far superior compressive strength, which sheds light on the widespread applications in thermal insulation.
ISSN:1546-542X
1744-7402
DOI:10.1111/ijac.14442