Production and characterization of lightweight vermiculite/geopolymer-based panels

Medri, Valentina; Papa, Elettra; Mazzocchi, M.; Laghi, Luca; Morganti, M.; Francisconi, J.; Landi, Elena

doi:10.1016/j.matdes.2015.06.145

Cited by 90 publications

(33 citation statements)

References 42 publications

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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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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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“…Due to the easy association with reinforcements, geopolymers bring forward an economically helpful substitute to Portland cement concrete. Their possible applications include as fireproof materials [15,19,20], thermal insulation [21][22][23], thermal shock refractories [24], lightweight materials [25][26][27], foams [28][29][30], etc.…”

Section: Introductionmentioning

confidence: 99%

Flexural Behavior of Carbon Textile-Reinforced Geopolymer Composite Thin Plate

Huang

Louda

Periyasamy

et al. 2018

Fibers

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Textile-reinforced Portland cement-based concrete has been researched and developed over the last few decades. It was widely used in a different range of applications, such as repair and/or strengthening of structural elements, thin walls, lightweight structures, façade elements, and others. Due to its varied application, this study aims to develop the carbon textile-reinforced geopolymer composite. Specimens of rectangular form with the dimensions of 400 × 100 × 15 mm3, reinforced with carbon textile, were produced. Four-point bending test was used to evaluate the effect of carbon textile on the mechanical strength of reinforced geopolymer composite based on the three factors: the different mortar compositions corresponding to the addition of the chopped basalt fiber (BF), the number of carbon textile layers, and the different thicknesses of the mortar cover layer. Besides that, a small part of the pull-out test was also considered to assess the adhesion strength at the interface between carbon textile and geopolymer mortar. The experimental results from the four-point bending test showed that the mechanical strength of composite specimens increased when the content of the chopped basalt fiber increased. With the increasing number of the textile layers, the specimens improved the flexural strength significantly. However, the flexural toughness of the specimens reinforced with three textile layers did not improve, as compared to those reinforced with two textile layers. The experimental results for the specimens related to the mortar cover thicknesses indicated that specimens with the mortar cover thickness of 2 mm provide the best strength. The experimental results from the pull-out tests showed that all the specimens have the same failure mode by slipping of the fiber yarn from the matrix.

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“…In the frame of designing low-weight insulating materials and flame-resistant barriers for buildings and vehicles, the development of multi-functional materials, able to couple energy efficiency with fire safety represents one of the main aims of the research [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…Insulating and flame-resistant materials have been recently developed as greener alternatives to the more traditional petrochemical-derived solutions [6]: an increasing use of renewable resources and new manufacturing processes integrating wastes are being largely adopted in the production of insulating products [1,4,[7][8][9]. Nevertheless, fully meeting the technical and safety requirements and at the same time reducing the environmental impact of the manufacturing process still represents an issue to address.…”

Section: Introductionmentioning

confidence: 99%

“…Geopolymers are produced by reacting an aluminosilicate powder with a highly concentrated alkali solution [11][12][13] and, may act as a binder for different fillers, producing various composite materials. Geopolymer composites can meet many of the ideal characteristics of lightweight materials for the building and transportation sectors, such as non-flammability, high temperature resistance, chemical resistance against acids and alkalis, durability, safety for human health and low carbon footprint [4,12,14]. For such remarkable properties, geopolymers and geopolymer composites have been widely investigated for the design of insulating materials in buildings and constructions, exploiting their intrinsic porosity eventually coupled with an induced macro-porosity by direct foaming [15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

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Porous Geopolymer Insulating Core from a Metakaolin/Biomass Ash Composite

et al. 2017

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Ashes derived from the combustion of vegetal and animal biomass still represent a mostly unexplored secondary raw material for the production of alkali-activated materials, given their peculiar chemical nature. In this work, calcium phosphate biomass ashes were successfully used as partially reactive fillers in a metakaolin-based geopolymer composite to produce, by direct foaming, sustainable and lightweight boards with thermal insulating properties. The investigated materials were obtained by activating a blend of metakaolin and biomass ash in a weight ratio of 1: 1 and foamed with the addition of H 2 O 2 in measure of 5 wt. %, to maximize the volume of disposed ash and ensure adequate properties to the material at the same time. The obtained geopolymer composite was characterized by microstructural, chemical-physical, mechanical and thermal analysis: the obtained results showed that biomass ash and metakaolin well integrated in the microstructure of the final porous material, which was characterized by a density of about 310 kg/m 3 and a thermal conductivity of 0.073 W/mK at a mean test temperature of 30 • C, coupled with an acceptable compressive strength of about 0.6 MPa. Dilatometric and thermogravimetric analysis, performed up to 1000 • C, highlighted the thermal stability of the composite, which could be regarded as a promising material for low-cost, self-bearing thermal insulating partitions or lightweight cores for thermostructural sandwich panels.

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Production and characterization of lightweight vermiculite/geopolymer-based panels

Cited by 90 publications

References 42 publications

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

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

Flexural Behavior of Carbon Textile-Reinforced Geopolymer Composite Thin Plate

Porous Geopolymer Insulating Core from a Metakaolin/Biomass Ash Composite

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