Fibre reinforced lightweight aggregates

Bernhardt, Markus; Tellesbø, Hilde; Justnes, Harald; Wiik, Kjell

doi:10.1016/j.jeurceramsoc.2013.11.009

Cited by 12 publications

(6 citation statements)

References 13 publications

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“…Different types of raw materials of natural and artificial origin are used for the production of lightweight aggregates (LWA) [1][2][3][4][5]. The chemical composition of the raw material determines the bloating (expansion) behaviour and the properties of the product [6].…”

Section: Introductionmentioning

confidence: 99%

The effect of additives on the properties of lightweight aggregates produced from clay

Bernhardt

Justnes

Tellesbø³

et al. 2014

Cement and Concrete Composites

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In an attempt to improve the properties, lightweight aggregates were produced from clay with the addition of Na 2 CO 3 , SiO 2 , Fe 2 O 3 , and Fe in quantities between 2 and 10 wt% and examined with respect to strength, density and expansion behaviour. The additives were mixed into dry clay powder, water was added and pellets were formed by hand and fired at 1120°C in a chamber furnace. Particle densities of the products ranged from 0.31-0.57 g/cm 3 , porosities from 78-89% and the solid strength from 0,54-1,58 MPa. The addition of Na 2 CO 3 proved to decrease the viscosity of the glass phase at the surface of the pellets but resulted in a 2 reduced expansion, irregular shape and pellets sticking together. SiO 2 addition did not give any major change in properties. The addition of Fe 2 O 3 increased the pore size in the centre of the pellets, however with insignificant change in strength and density. Adding 5 wt% metallic iron powder led to LWA pellets with increased porosity, reduced density, larger pores and low mechanical strength and could be an useful additive in applications where low density is more important than strength.

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Section: Introductionmentioning

confidence: 99%

The effect of additives on the properties of lightweight aggregates produced from clay

Bernhardt

Justnes

Tellesbø³

et al. 2014

Cement and Concrete Composites

Self Cite

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“…The reduction in strength due to increasing porosity is based on the relationship between strength and density. A uniform pore size can increase the compressive strength of clay LWAs because it promotes a more homogenous stress distribution throughout the microstructure [31,42]. However, research to date has not adequately investigated the effect of pore structure on the strength of clay LWAs.…”

Section: Properties Of Lwa Manufactured Using Claymentioning

confidence: 99%

Use of clay in the manufacture of lightweight aggregate

Ayati

Ferrándiz-Mas

Newport

et al. 2018

Construction and Building Materials

124

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Clay is used as a raw material for the production of lightweight aggregates because it is readily processed into suitable granules and forms low-density but high strength aggregate particles when sintered at relatively low temperatures. The use of waste clay generated by major infrastructure development projects to make lightweight aggregate has a positive environmental impact and contributes towards a more circular economy. This paper reviews the manufacturing process used to produce lightweight aggregates from clay and the influence of processing conditions on properties. It also reviews secondary materials that have been incorporated into clays to produce lightweight aggregates. Additional research is required to improve understanding of the effects of composition and production parameters on the pore structure, density, water adsorption and strength of clay derived lightweight aggregates.

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“…18,19 Prior to complete sintering, precipitations of anorthite crystals change chemical constitutions of residual melts and lead to rapid increase in molten viscosities, which exclude possibilities to fabricate great-valued products with worth sinterability. 20 Secondary phase-reinforced mechanism is another effective method to improve mechanical performances of anorthite ceramics with the presence of carbon fibers 21,22 and whiskers. [23][24][25] Growths of anorthite crystal during vitrification are effectively limited by mullite whiskers, which are strongly combined with small-sized anorthite grains to fabricate porous anorthite with substantial triple increase in compressive strength.…”

Section: Introductionmentioning

confidence: 99%

“…Secondary phase‐reinforced mechanism is another effective method to improve mechanical performances of anorthite ceramics with the presence of carbon fibers 21,22 and whiskers 23–25 . Growths of anorthite crystal during vitrification are effectively limited by mullite whiskers, which are strongly combined with small‐sized anorthite grains to fabricate porous anorthite with substantial triple increase in compressive strength 26 .…”

Section: Introductionmentioning

confidence: 99%

Enhanced mechanical properties for porous ceramics with an in situ formation of anorthite crystals during vitrification

Zhang

Liu

Han

et al. 2022

Int J Applied Ceramic Tech

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Porous anorthite ceramics are widely applied as catalysis supports, separation membranes, and thermal insulations at high temperatures. In situ formation of anorthite crystals during vitrification is herein employed to improve mechanical properties of porous anorthite with modulated grain sizes on pore walls. Sintering parameters of shrinkage (5%-30%), open porosity (31.0%-58.3%), density (1.18-1.71 g/cm 3 ), and mass loss (12.20%-18.26%) are estimated to investigate the influences of sintering aids of calcite, fused mullite, and silicon carbide or talcum on the densification processes of porous anorthite. The Kissinger equation is used to determine the activation energy of 783 kJ/mol for the crystallization of anorthite, which is significantly low for the formation of anorthite crystals through surface nucleation mechanism in present flux-rich melt. In situ crystallization and simultaneous densification under liquid drainages are favored for whiskersreinforced mechanism to enhance flexural strengths (6.9-19.4 MPa) for porous anorthite with the porosity of 49.6%-58.3% through the formation of hierarchical nano-and microscale structures during vitrification.

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Fibre reinforced lightweight aggregates

Cited by 12 publications

References 13 publications

The effect of additives on the properties of lightweight aggregates produced from clay

The effect of additives on the properties of lightweight aggregates produced from clay

Use of clay in the manufacture of lightweight aggregate

Enhanced mechanical properties for porous ceramics with an in situ formation of anorthite crystals during vitrification

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