Effects of high-temperature heat treatment on the mechanical properties of unidirectional carbon fiber reinforced geopolymer composites

He, Peigang; Jia, Dechang; Lin, Tiesong; Wang, Meirong; Zhou, Yu

doi:10.1016/j.ceramint.2010.02.012

Cited by 219 publications

(110 citation statements)

References 26 publications

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“…1 shows the XRD patterns of the metakaolin, pure geopolymer matrix, C f -SiC f /KGP and C f -SiC f -Al 2 O 3p /KGP composites. Metakaolin particles showed characteristic amorphous hump between 22° 2T, and several reflections from quartz present introduced by the raw kaolin [17]. The pure geopolymer matrix displayed typical broad amorphous humps around 28° 2T.The characteristic amorphous hump of the C f -SiC f /KGP composites was similar to the pure geopolymer matrix, but shifted to a lower position around 27°.…”

Section: Materials and Experimentsmentioning

confidence: 65%

“…The composition of the geopolymer matrix was SiO 2 /Al 2 O 3 = 4.0, K 2 O/SiO 2 = 0.3 and H 2 O/K 2 O = 11 (mole ratio) according our previous work [17,22]. The raw materials were KOH (Tianjin Guangfu Indus., China), silica sol (Jiangsu Xiagang, Indus., China), kaolin (95%, Fengxian Reagent Factory, China) and α-Al 2 O 3p (Xiamen Fushixin Indus., China).…”

Section: Materials and Experimentsmentioning

confidence: 99%

“…However, the pure geopolymers showed disadvantages of both low mechanical performance and catastrophic fracture behavior, thus limits its applications as structural components [1][2][3][4][5][6][7]. In recent years, many studies have been explored on geopolymer matrix composites to overcome the disadvantages of itself low strength and brittle failure, including nanotube [8,9], graphene [10][11], particles [12][13], short fiber [14][15][16]20] and continuous fiber [17][18][19]. Ranjbar [19] evaluated fiber-matrix interaction and mechanical properties of two different fibers (polypropylene (PPF) and micro steel fibers (MSF)) reinforced fly ash based geopolymer.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and mechanical performance of Cf-SiCf-(Al₂O₃p) reinforced geopolymer composites

Yan

Jia

et al. 2017

MATEC Web Conf.

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Abstract. The C f -SiC f -(Al 2 O 3p )/KGP composites were successfully prepared by the method that mixing a kind of hybrid fiber preform predeveloped and geopolymer resin. The synergistic effects of the hybrid fibers and Al 2 O 3 particles on the composites were investigated. Results show that all the composites showed typical amorphous structure. Mechanical properties of the C f -SiC f -(Al 2 O 3p )/KGP composites were improved remarkably due to the addition of the hybrid fibers and Al 2 O 3 particles. The flexural strength and Young s modulus of the C f -SiC fAl 2 O 3p /KGP composites with 1 mm length SiC f were reached 62.4±2.1 MPa and 24.1±1.6 GPa, respectively. The C f -SiC f -(Al 2 O 3p )/KGP composites showed non-catastrophic behavior rather than the catastrophic failure.

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Section: Materials and Experimentsmentioning

confidence: 65%

Section: Materials and Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Preparation and mechanical performance of Cf-SiCf-(Al₂O₃p) reinforced geopolymer composites

Yan

Jia

et al. 2017

MATEC Web Conf.

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“…Although MK-based geopolymers can exhibit structural stability at temperatures higher than 1000 °C, some reports show a remarkable loss of mechanical strength at temperatures below 300 °C as a consequence of the dehydration and dehydroxylation processes of the reaction products (53). The inclusion of fibres can curb this thermal shrinkage at temperatures between 200 °C and 500 °C, reducing the loss of mechanical strength and improving thermal stability (45,48). The inclusion of carbon fibres in geopolymers that have been exposed to 1400 °C under controlled atmosphere has been shown to lead to the formation of β-SiC, indicating that the C from the fibres can react with Si-O units from the reaction products (48).…”

Section: Introductionmentioning

confidence: 99%

“…The inclusion of fibres can curb this thermal shrinkage at temperatures between 200 °C and 500 °C, reducing the loss of mechanical strength and improving thermal stability (45,48). The inclusion of carbon fibres in geopolymers that have been exposed to 1400 °C under controlled atmosphere has been shown to lead to the formation of β-SiC, indicating that the C from the fibres can react with Si-O units from the reaction products (48). The structural densification and subsequent formation of leucite-type structures in MK-based geopolymers activated with K-silicate and then exposed to temperatures higher than 900 °C can promote the development of advanced ceramics that exhibit considerably high flexural strength (> 100 MPa) (54).…”

Section: Introductionmentioning

confidence: 99%

A Novel MK-based Geopolymer Composite Activated with Rice Husk Ash and KOH: Performance at High Temperature

2017

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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 ºC. 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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Microwave Enhanced Drying and Firing of Geopolymers

Gubb¹,

Baranova²,

Allan³

et al. 2011

Ceramic Engineering and Science Proceedings

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The feasibility of using microwave energy to dry and fire pre-cured geopolymers was experimentally demonstrated, and supported by analysis of published microwave dielectric data for geopolymers. Dielectric loss tangents and half power microwave absorption depths were calculated from published room temperature dielectric constant and loss values of various geopolymer compositions. The published data indicated that geopolymers would heat at room temperature with microwave energy. Several laboratory experiments were performed to test the heating behavior of sodium and potassium based geopolymer compositions. Experiments demonstrated more vigorous microwave heating with sodium geopolymers than with potassium geopolymers. Both compositions were dried in less than 10 minutes with pure microwave heating. Further heating with pure microwave energy resulted in non-uniform, rapid heating, or "thermal runaway", with localized melting of the geopolymer. Hybrid microwave heating with susceptors resulted in uniformly fired geopolymers, without melting. INTRODUCTIONInterest in geopolymers has accelerated in recent years due to their possible use in structural applications, dentistry, and hazardous waste stabilization, while maintaining a trivial environmental impact compared to traditional building materials. Many useful geopolymer compositions are fabricated by low temperature chemical reaction based curing processes 1 " 3 . Some recent research has been reported for using microwave energy to enhance curing and drying 4 ' 5 . Other research has focused on high temperature firing of geopolymers, which can develop stronger glass-ceramic materials 6 " 8 . In situations where heat is required, as in drying and firing, microwave energy provides an energy efficient alternative in place of conventional heating. Traditional radiant heating methods rely on thermal conduction to deliver heat throughout a material.Microwaves generate heat throughout the volume of the material, allowing faster, more uniform heating to occur. Volumetric microwave heating helps to overcome sluggish endothermic phase transitions, such as evaporation of water or decomposition of kaolin to metakaolin through the loss of hydroxides. Both drying and dehydration occur in the firing of geopolymers. In traditional heating, these reactions often require slow heating, as the endothermic reaction prevents heat from progressing into the product until the reaction completes first at the surface. Microwaves can generate heat throughout the part despite an endotherm 9 .When microwave energy is the sole source of heat, a material that absorbs microwave energy will heat volumetrically, but cool from the surface. This situation creates an "inverse temperature profile" in which the sample is warmer inside and cooler at the surface during heating. This is opposite of traditional radiant heating where the material will be cooler in the center. In some materials, the inverse temperature profile can lead to thermal runaway -where the hotter center heats better than the cooler sur...

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Effects of high-temperature heat treatment on the mechanical properties of unidirectional carbon fiber reinforced geopolymer composites

Cited by 219 publications

References 26 publications

Preparation and mechanical performance of Cf-SiCf-(Al₂O₃p) reinforced geopolymer composites

Preparation and mechanical performance of Cf-SiCf-(Al₂O₃p) reinforced geopolymer composites

A Novel MK-based Geopolymer Composite Activated with Rice Husk Ash and KOH: Performance at High Temperature

Microwave Enhanced Drying and Firing of Geopolymers

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Effects of high-temperature heat treatment on the mechanical properties of unidirectional carbon fiber reinforced geopolymer composites

Cited by 219 publications

References 26 publications

Preparation and mechanical performance of Cf-SiCf-(Al2O3p) reinforced geopolymer composites

Preparation and mechanical performance of Cf-SiCf-(Al2O3p) reinforced geopolymer composites

A Novel MK-based Geopolymer Composite Activated with Rice Husk Ash and KOH: Performance at High Temperature

Microwave Enhanced Drying and Firing of Geopolymers

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Product

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Preparation and mechanical performance of Cf-SiCf-(Al₂O₃p) reinforced geopolymer composites

Preparation and mechanical performance of Cf-SiCf-(Al₂O₃p) reinforced geopolymer composites