Mechanical properties of lightweight aggregates

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

doi:10.1016/j.jeurceramsoc.2013.05.013

Cited by 59 publications

(24 citation statements)

References 50 publications

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“…Nevertheless, it should be noted that the molar fraction of Fe is about 30 % higher in the 5 % Fe sample than in the 5 % Fe 2 O 3 sample which may affect some of the observed variations between these two samples. The pellets of the 5 % Fe sample become very fragile and show a poor mechanical strength due to the high porosity and the thin shell, consistent with observations previously reported by Bernhardt et al [14].…”

Section: Addition Of Iron (Fe 2 O 3 / Fe)supporting

confidence: 91%

“…The high porosity of the 5 % Fe sample means inevitably a low density (Fig. 4) [14,25,26]. This requirement is fulfilled for all samples.…”

Section: Addition Of Na 2 Comentioning

confidence: 95%

“…2 is a strength value which is independent of the total porosity, P, and consequently allows us to assess the strength of the matrix phase as such and compare different samples. The concept of solid strength is further rationalized in [14].…”

Section: Materials Testingmentioning

confidence: 99%

“…4 assuming a perfect sphere and equal damage/crumbling at the "north-and south-pole" of the pellet. a c values between 0.2 and 0.6 are considered to be within an acceptable range [14].…”

Section: Materials Testingmentioning

confidence: 99%

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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: Addition Of Iron (Fe 2 O 3 / Fe)supporting

confidence: 91%

“…The high porosity of the 5 % Fe sample means inevitably a low density (Fig. 4) [14,25,26]. This requirement is fulfilled for all samples.…”

Section: Addition Of Na 2 Comentioning

confidence: 95%

Section: Materials Testingmentioning

confidence: 99%

“…4 assuming a perfect sphere and equal damage/crumbling at the "north-and south-pole" of the pellet. a c values between 0.2 and 0.6 are considered to be within an acceptable range [14].…”

Section: Materials Testingmentioning

confidence: 99%

See 2 more Smart Citations

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

View full text Add to dashboard Cite

show abstract

“…2 is a strength value which is independent of the total porosity, P [15], and consequently allows a comparison of the strength of the matrix phase.…”

Section: Materials Testingmentioning

confidence: 99%

The effect of heat treatment and cooling rate on the properties of lightweight aggregates

Bernhardt

Tellesbø²,

Justnes

et al. 2014

Journal of the European Ceramic Society

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Lightweight aggregates (LWA) were produced from clay in the laboratory. After firing different heat treatments and cooling rates were applied and the resulting material was investigated with respect to strength and microstructure. Fast cooling led to the formation of micro cracks and weakened the material whereas slow cooling enhanced the strength of LWA. The residence time at temperatures between 700°C and 900°C led to differences in average oxidation state of iron in the matrix phase leading to substantial changes in thermal behaviour of the matrix phase. The combination of a highly oxidized shell and a reduced core 2 proved to enhance the strength of LWA. A two hour heat treatment at 800°C in air combined with a subsequent slow cooling rate (0.7°C/min) applied to LWA produced in an industrial rotary kiln led to a strength increase of 114 % compared to material of the normal production without changing any other property.

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Performance of Sintered Pozzolanic Artificial Aggregates as Coarse Aggregate Replacement in Concrete

Razak

Abdullah

Kamarudin

et al. 2021

Lecture Notes in Civil Engineering

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Mechanical properties of lightweight aggregates

Cited by 59 publications

References 50 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

The effect of heat treatment and cooling rate on the properties of lightweight aggregates

Performance of Sintered Pozzolanic Artificial Aggregates as Coarse Aggregate Replacement in Concrete

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