Properties and microstructure of lightweight aggregate produced from lignite coal fly ash and recycled glass

Kourti, Ioanna; Cheeseman, Christopher R.

doi:10.1016/j.resconrec.2009.12.006

Cited by 99 publications

(49 citation statements)

References 31 publications

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“…For example the addition of amorphous SiO 2 in form of cullet powder to sewage sludge ash for the production of LWA was reported to enhance the bloating behaviour of the material [11]. Other studies reported the addition of quartz sand to be beneficial for the production of LWA from smecite-rich claystone-marlstone rocks or the addition of waste glass to lignite coal fly ash leading to LWA with advanced physical and mechanical properties [4,12]. The addition of CaO (a flux) to water reservoir sediments led to an enhanced expansion and pore growth during firing but resulted in a LWA with decreased strength [13].…”

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

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“…This could be related to the closing of open porosity during the sintering process in possible presence of liquid phase or densification of particles resulted by interaction of solid phases shown in the previous investigations of matrix material -clay from deposit Apriki [9,10] and the ones mentioned in literature [13].…”

Section: Ceramic Properties Of Materialsmentioning

confidence: 81%

Elaboration of new ceramic composites containing glass fibre production wastes

Rozenštrauha¹,

Sosins²,

Krāģe³

et al. 2013

Bol. Soc. Esp. Ceram. Vidr.

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Two main by-products or waste from the production of glass fibre are following: sewage sludge containing montmorillonite clay as sorbent material and ca 50% of organic matter as well as waste glass from aluminiumborosilicate glass fibre with relatively high softening temperature (> 600 ºC). In order to elaborate different new ceramic products (porous or dense composites) the mentioned by-products and illitic clay from two different layers of Apriki deposit (Latvia) with illite content in clay fraction up to 80-90% was used as a matrix. The raw materials were investigated by differential-thermal (DTA) and XRD analysis. Ternary compositions were prepared from mixtures of 15–35 wt % of sludge, 20 wt % of waste glass and 45–65 wt % of clay and the pressed green bodies were thermally treated in sintering temperature range from 1080 to 1120 ºC in different treatment conditions. Materials produced in temperature range 1090–1100 ºC with the most optimal properties - porosity 38-52%, water absorption 39–47% and bulk density 1.35–1.67 g/cm³ were selected for production of porous ceramics and materials showing porosity 0.35–1.1%, water absorption 0.7–2.6 % and bulk density 2.1–2.3 g/cm³ - for dense ceramic composites. Obtained results indicated that incorporation up to 25 wt % of sewage sludge is beneficial for production of both ceramic products and glass-ceramic composites according to the technological properties. Structural analysis of elaborated composite materials was performed by scanning electron microscopy(SEM). By X-ray diffraction analysis (XRD) the quartz, diopside and anorthite crystalline phases were detected.

Durante la obtención de ciertas fibras de vidrio se generan dos subproductos o residuos principalmente: Lodo de arcilla montmorillonítica capaz de adsorber el 50 % de materia orgánica y un vidrio silicato alumínico con temperatura de reblandecimiento relativamente alta (> 600 ºC). Con el fin de elaborar nuevos materiales cerámicos, tanto porosos como densos, se han utilizado estos dos residuos y unas arcillas procedente de unos depósitos mineros de Apriki (Letonia) cuyo contenido en la fracción illítica es > 80 %. Todas las estas materias primas se han estudiado por análisis térmico diferencial (ATD) y análisis por difracción de rayos X (DRX). Se prepararon diferentes mezclas de los tres componentes con 15-35 % en peso del lodo, 20% en peso del vidrio y 45–65 % en peso de las arcillas y después de prensarlas fueron tratadas térmicamente para su sinterización en un rango de temperaturas entre 1080 y 1120 ºC y con diferentes condiciones. Los materiales obtenidos a temperaturas entre 1090-1100 ºC y con las mejores propiedades (porosidad 38-52%, absorción de agua 39–47% y densidad 1,35 – 1,67 g/cm³, fueron los seleccionados para producción de cerámica porosa y los materiales con porosidad 0,35–1,1%, absorción de agua 0,7–2,6% y densidad 2,1–2,3 g/cm³, para materiales cerámicos densos. Los resultados obtenidos indican que la incorporación...

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“…Previous research had used the sintering method for producing lightweight aggregate in a furnace up until 1000 0 C -1200 0 C to fuse particles at the points of mutual contact [5][6][7][8][9]. The raw materials usually are pelletizing by mixing with 20 -30 % water as a binding agent to get the desire and consistency size and dried at 110 0 C. There are different types of palletizer machine that can be used during the agglomeration process by granulation, such as disc or pan type, drum type, cone type and mixer type [10].…”

Section: Sinteringmentioning

confidence: 99%

A Review on the Manufacturing of Lightweight Aggregates Using Industrial By-Product

et al. 2016

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Abstract:The waste materials from industrial are one of the concern issues in sustainable development. Recycle and reduce the waste material is one of the strategies to produce the better sustainable system. One of the methods is by using the waste materials to produce artificial aggregate. There are wide applications of artificial aggregate, for instance construction, agriculture, geotechnical fill, waste water, drainage and many more. Physical properties such as bulk density, specific gravity, unit weight, porosity and water absorption are important criteria. The performance of the artificial aggregate varies, depending on the application.

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Properties and microstructure of lightweight aggregate produced from lignite coal fly ash and recycled glass

Cited by 99 publications

References 31 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

Elaboration of new ceramic composites containing glass fibre production wastes

A Review on the Manufacturing of Lightweight Aggregates Using Industrial By-Product

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