Alkali-Activated Fly Ash Foams – Synthesis, Chemo-Physical Properties and Microstructure Modeling

Petr Hlaváček; Vit Šmilauer; František Škvára

doi:10.4028/www.scientific.net/AST.92.14

Paper Titles

Preface

Fabrication and Characterization of Geopolymers from Japanese Volcanic Ashes
p.1

Addition of Ammonium Molybdate in Geopolymer Formulation
p.8

Alkali-Activated Fly Ash Foams – Synthesis, Chemo-Physical Properties and Microstructure Modeling
p.14

Effect of the Reactivity of the Alkaline Solution and the Metakaolin on the Geopolymer Formation
p.20

Ceramic Waste as New Precursors for Geopolymerization
p.26

Synthesis of Inorganic Polymers Using a CaO-Al₂O₃-FeO-SiO₂ Slag
p.32

Studies of Natural and Accelerated Carbonation in Metakaolin-Based Geopolymer
p.38

A Taguchi Approach for the Synthesis Optimization of Metakaolin Based Geopolymers
p.44

HomeAdvances in Science and TechnologyAdvances in Science and Technology Vol. 92Alkali-Activated Fly Ash Foams – Synthesis,...

Alkali-Activated Fly Ash Foams – Synthesis, Chemo-Physical Properties and Microstructure Modeling

Abstract:

Inorganic foams offer several unique properties such as low thermal conductivity, fire resistance, or UV stability. Inorganic foam specimens were synthesized from fly ash and aluminium powder through an alkali-activation process. Depending on mix proportions, bulk densities ranged between 400 and 800 kg/m³. Thermal treatment at 80°C for 12 hours accelerated curing process. Compressive strength was found in the range 4.5-9.0 MPa, flexural strength 0.6-1.7 MPa, Young's modulus 0.6-1.1 GPa, thermal conductivity 0.14-0.16 W/m/K and thermal capacity around 1100 J/kg/K. Exposing the foams to temperature 800°C led to a small decrease of compressive strength while exposure to 1100°C sintered the foam to higher strength of 13 MPa. Volumetric shrinkage 20% occurred at 1100°C without further disintegration. Residual compressive strength was determined after exposure to NaCl, HCl, Na₂SO₄, MgSO₄, H₂SO₄. The highest reduction to 20% occured in both acids with pH=2 after one year of exposition. Digitized microstructures entered finite element analysis to validate a stress-strain diagram.

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Periodical:

Advances in Science and Technology (Volume 92)

Pages:

14-19

DOI:

https://doi.org/10.4028/www.scientific.net/AST.92.14

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Online since:

October 2014

Authors:

Petr Hlaváček*, Vit Šmilauer, František Škvára

Keywords:

Alkali-Activation, Chemical Durability, Fly Ash (FA), Foam, Mechanical Property

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