A novel MK-based geopolymer composite activated with rice husk ash and KOH: Performance at high temperature

M. A. Villaquirán-Caicedo; R. Mejía De Gutiérrez; N. C. Gallego

doi:10.3989/mc.2017.02316

A novel MK-based geopolymer composite activated with rice husk ash and KOH: Performance at high temperature

M. A. Villaquirán-Caicedo, R. Mejía De Gutiérrez, N. C. Gallego

Nanomaterials Chemistry Group

Research output: Contribution to journal › Article › peer-review

46 Scopus citations

Abstract

Geopolymers were produced using an environmentally friendly alkali activator (based on Rice Husk Ash and potassium hydroxide). Aluminosilicates particles, carbon and ceramic fibres were used as reinforcement materials. The effects of reinforcement materials on the flexural strength, linear-shrinkage, thermophysical properties and microstructure of the geopolymers at room and high temperature (1200 °C) were studied. The results indicated that the toughness of the composites is increased 110.4% for geopolymer reinforced by ceramic fibres (G-AF) at room temperature. The presence of particles improved the flexural behaviour 265% for geopolymer reinforced by carbon fibres and particles after exposure to 1200 °C. Linear-shrinkage for geopolymer reinforced by ceramic fibres and particles and the geopolymer G-AF compared with reference sample (without fibres and particles) is improved by 27.88% and 7.88% respectively at 900 °C. The geopolymer materials developed in this work are porous materials with low thermal conductivity and good mechanical properties with potential thermal insulation applications for building applications.

Original language	English
Journal	Materiales de Construccion
Volume	67
Issue number	326
DOIs	https://doi.org/10.3989/mc.2017.02316
State	Published - Apr 1 2017

Funding

This study was supported by the Colombian Institute for the Development of Science, Technology, and Innovation (Colciencias) (Project Hybricement, Contract N° 0638-2013), Center of Excellence for Novel Materials - CENM, and Universidad del Valle (Cali, Colombia).

Funders	Funder number
Center of Excellence for Novel Materials
Colombian Institute for the Development of Science, Technology, and Innovation
Departamento Administrativo de Ciencia, Tecnología e Innovación (COLCIENCIAS)	N° 0638-2013
Universidad del Valle

Keywords

Alkali-activated cement
Composite
Mechanical properties
Metakaolin
Thermal analysis

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10.3989/mc.2017.02316

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title = "A novel MK-based geopolymer composite activated with rice husk ash and KOH: Performance at high temperature",

abstract = "Geopolymers were produced using an environmentally friendly alkali activator (based on Rice Husk Ash and potassium hydroxide). Aluminosilicates particles, carbon and ceramic fibres were used as reinforcement materials. The effects of reinforcement materials on the flexural strength, linear-shrinkage, thermophysical properties and microstructure of the geopolymers at room and high temperature (1200 °C) were studied. The results indicated that the toughness of the composites is increased 110.4% for geopolymer reinforced by ceramic fibres (G-AF) at room temperature. The presence of particles improved the flexural behaviour 265% for geopolymer reinforced by carbon fibres and particles after exposure to 1200 °C. Linear-shrinkage for geopolymer reinforced by ceramic fibres and particles and the geopolymer G-AF compared with reference sample (without fibres and particles) is improved by 27.88% and 7.88% respectively at 900 °C. The geopolymer materials developed in this work are porous materials with low thermal conductivity and good mechanical properties with potential thermal insulation applications for building applications.",

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author = "Villaquir{\'a}n-Caicedo, {M. A.} and {Mej{\'i}a De Guti{\'e}rrez}, R. and Gallego, {N. C.}",

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AU - Gallego, N. C.

PY - 2017/4/1

Y1 - 2017/4/1

N2 - Geopolymers were produced using an environmentally friendly alkali activator (based on Rice Husk Ash and potassium hydroxide). Aluminosilicates particles, carbon and ceramic fibres were used as reinforcement materials. The effects of reinforcement materials on the flexural strength, linear-shrinkage, thermophysical properties and microstructure of the geopolymers at room and high temperature (1200 °C) were studied. The results indicated that the toughness of the composites is increased 110.4% for geopolymer reinforced by ceramic fibres (G-AF) at room temperature. The presence of particles improved the flexural behaviour 265% for geopolymer reinforced by carbon fibres and particles after exposure to 1200 °C. Linear-shrinkage for geopolymer reinforced by ceramic fibres and particles and the geopolymer G-AF compared with reference sample (without fibres and particles) is improved by 27.88% and 7.88% respectively at 900 °C. The geopolymer materials developed in this work are porous materials with low thermal conductivity and good mechanical properties with potential thermal insulation applications for building applications.

AB - Geopolymers were produced using an environmentally friendly alkali activator (based on Rice Husk Ash and potassium hydroxide). Aluminosilicates particles, carbon and ceramic fibres were used as reinforcement materials. The effects of reinforcement materials on the flexural strength, linear-shrinkage, thermophysical properties and microstructure of the geopolymers at room and high temperature (1200 °C) were studied. The results indicated that the toughness of the composites is increased 110.4% for geopolymer reinforced by ceramic fibres (G-AF) at room temperature. The presence of particles improved the flexural behaviour 265% for geopolymer reinforced by carbon fibres and particles after exposure to 1200 °C. Linear-shrinkage for geopolymer reinforced by ceramic fibres and particles and the geopolymer G-AF compared with reference sample (without fibres and particles) is improved by 27.88% and 7.88% respectively at 900 °C. The geopolymer materials developed in this work are porous materials with low thermal conductivity and good mechanical properties with potential thermal insulation applications for building applications.

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KW - Thermal analysis

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A novel MK-based geopolymer composite activated with rice husk ash and KOH: Performance at high temperature

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Keywords

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