Effect of cordierite addition on compressive strength and thermal stability of metakaolin based geopolymer

Hemra, Khanthima; Aungkavattana, Pavadee

doi:10.1016/j.apt.2016.04.019

Cited by 47 publications

(30 citation statements)

References 23 publications

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“…The type of filler material used can influence phase transformation at a high temperature, and minimize porosity and shrinkage of the material [20]. Various kinds of inert fillers in geopolymer composites-including quartz sand [2, 16,[21][22][23][24][25], crushed brick [26], corundum [26][27][28], kaolinite [26], chamotte [20,23,25,29], cordierite [30], vermiculite [31], carbon fiber [32,33], or silicon carbide [11]-were investigated in many studies. Buchwald et al [20] described the influence of fillers on the mechanical properties of geopolymers.…”

Section: Introductionmentioning

confidence: 99%

“…They found, among others, that the addition of quartz or chamotte lowered porosity and provided higher compressive strength. Another study documented that the compressive strength of geopolymers increases with the increasing addition of cordierite [30]. Since the geopolymer binders or composites have good resistance to high temperatures, it is desirable to study their properties after heat exposure and at required elevated temperatures (in situ).…”

Section: Introductionmentioning

confidence: 99%

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Effect of Filler Type on the Thermo-Mechanical Properties of Metakaolinite-Based Geopolymer Composites

Kohout

Koutník

2020

Materials

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Metakaolinite-based geopolymer binder was prepared at room temperature by mixing calcined claystone and potassium alkaline activator. Various granular inorganic fillers were added, amounting to 65 vol % to form geopolymer composites. The effect of four types of fillers (sand quartz, chamotte, cordierite, and corundum) on the thermo-mechanical properties of metakaolinite-based geopolymer composites were investigated. The samples were also examined by an X-ray diffraction method to determine their phase composition. The pore size distributions were determined by a mercury intrusion porosimeter. The XRD revealed the crystallization of new phase (leucite) after thermal exposure at 1000 °C and higher. Geopolymer binders had low mechanical properties (flexural strength 2.5 MPa and compressive strength 45 MPa) and poor thermo-mechanical properties (especially high shrinkage—total shrinkage 9%) compared to geopolymer composites (flexural strength up to 13.8 MPa, compressive strength up to 95 MPa and total shrinkage up to 1%). The addition of fillers reduced the shrinkage of geopolymers and improved their mechanical properties. The results have shown that the compressive strength tested in situ and after exposure to high temperature are in conflict. Geopolymer composites with the addition of chamotte had the best mechanical properties before and after thermal exposure (compressive strength up to 95 MPa). The average pore size diameters increased with the increasing temperature (from 10 nm to approx. 700 nm). The fillers addition decreased the pore volume (from 250 mm3/g to approx. 100 mm3/g).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Filler Type on the Thermo-Mechanical Properties of Metakaolinite-Based Geopolymer Composites

Kohout

Koutník

2020

Materials

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“…Most frequently granular fillers are used for this purpose, such as silica sand [24], calcite and dolomite sand [25], grinded electrical porcelain [26], grinded high-alumina refractory brick [27], aAl 2 O 3 powder [28], a-quartz sand and fine alumina powder [29], chamotte powder [30], kyanite (nesosilicate) aggregates [31], cordierite powder [32], burned clay [33], expanded clay [34], quartz fume [35]. Besides, fiber reinforcement was applied such as SiC fibers [36], basalt fibers [37], also steel or polymer fibers [38].…”

Section: Introductionmentioning

confidence: 99%

Thermomechanical properties of particle-reinforced geopolymer composite with various aggregate gradation of fine ceramic filler

Kovařík

Rieger

Kadlec

et al. 2017

Construction and Building Materials

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“…Geopolymer composites have been produced with different types of particles with the aim of modifying their microstructural, mechanical, and thermal properties. Nanopowders of carbon, α‐alumina and mullite nanosilica, cordierite, zircon, quartz and illite clay mineral, refractory particles ground electrical porcelain, hollow ceramic microspheres, chamotte, river sand and vermiculite have been incorporated into geopolymers. The incorporation of α‐Al 2 O 3 in high volumes increases the compressive strength of the geopolymer and the incorporation of 10.5 wt% chamotte particles into geopolymer pastes based on metakaolin decreases the crystallization temperature of the leucite and increases the flexural strength of the composite …”

Section: Introductionmentioning

confidence: 99%

Mechanical and microstructural analysis of geopolymer composites based on metakaolin and recycled silica

Villaquirán-Caicedo

Gutiérrez

2018

J Am Ceram Soc

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This paper evaluated mechanical and thermal stability of alkali‐activated materials obtained from metakaolin and alternative silica sources, such as rice husk ash (RHA) and silica fume (SF), and were reinforced with recycled ceramic particles (RP) obtained by grinding bricks. Specimens were produced, and after 7 days of curing, they were exposed to temperatures between 300 and 1200°C to determine the influence that different percentages of RP had on the mechanical behavior and microstructure of the produced composites. The results showed a reduction in the linear contraction by 10.22% with 20 wt% RP and that the reinforcing materials improved the mechanical performance of the geopolymers after exposure to high temperatures; the compressive strengths reached 137.7 (±11.4) MPa after being exposed to 1200°C for the matrix based on RHA and 180.6 (±19.15) MPa after being reinforced with 20 wt% RP. The improvement was mainly due to densification and the formation of crystalline products such as leucite, kalsilite, and mullite.

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Effect of cordierite addition on compressive strength and thermal stability of metakaolin based geopolymer

Cited by 47 publications

References 23 publications

Effect of Filler Type on the Thermo-Mechanical Properties of Metakaolinite-Based Geopolymer Composites

Effect of Filler Type on the Thermo-Mechanical Properties of Metakaolinite-Based Geopolymer Composites

Thermomechanical properties of particle-reinforced geopolymer composite with various aggregate gradation of fine ceramic filler

Mechanical and microstructural analysis of geopolymer composites based on metakaolin and recycled silica

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