Lightweight aggregates from waste materials: Reappraisal of expansion behavior and prediction schemes for bloating

Dondi, Michele; Cappelletti, Piergiulio; D’Amore, Matteo; Gennaro, Roberto de; Graziano, Sossio Fabio; Langella, Alessio; Raimondo, M.; Zanelli, Chiara

doi:10.1016/j.conbuildmat.2016.09.111

Cited by 128 publications

(50 citation statements)

References 145 publications

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“…wt.% and 12.75 wt.%. These are in the range associated with a suitable high-temperature viscosity which is required for bloating to produce low-density LWA (Dondi et al, 2016).…”

Section: Dclwamentioning

confidence: 99%

Manufacture and performance of lightweight aggregate from waste drill cuttings

Ayati

Molineux

Newport

et al. 2019

Journal of Cleaner Production

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This research investigated the technical feasibility of transforming waste drill cuttings into lightweight aggregate. Drill cuttings produced from the North Sea oil field were dried, ball milled, formed into pellets and fired at temperatures between 1160 and 1190°C. Physical properties of the manufactured lightweight aggregate, including particle density, water absorption and compressive strength, were determined. The drill cuttings had a typical evaporite composition containing high concentrations of chloride salts. This limits the potential for using the as-received drill cutting samples in lightweight aggregate production as the products formed show high levels of leaching. The addition of a washing pre-treatment to reduce the leaching of chloride ions was necessary. Washing also reduced the initial sintering temperature and improved lightweight aggregate properties. Sintering at 1180°C produced lightweight aggregate with particle density of 1.29 g/cm³, water absorption of 3.6% and compressive strengths of 4.4 MPa. The research showed that lightweight aggregate manufacturing represents a resource efficient option for the reuse of waste drill cuttings and provides significant material saving and landfill diversion.

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“…wt.% and 12.75 wt.%. These are in the range associated with a suitable high-temperature viscosity which is required for bloating to produce low-density LWA (Dondi et al, 2016).…”

Section: Dclwamentioning

confidence: 99%

Manufacture and performance of lightweight aggregate from waste drill cuttings

Ayati

Molineux

Newport

et al. 2019

Journal of Cleaner Production

View full text Add to dashboard Cite

show abstract

“…However, the proportion of alumina-iron oxides-alkaline earths, regardless of silica content is also reported to control bloating [28]. As a result, it is difficult to predict whether or not a material will bloat based only on chemical composition data, and normally firing trials need to be completed [29].…”

Section: Lwa Manufactured From Claymentioning

confidence: 99%

“…Most clay minerals have demonstrated bloating and can be used to form LWA [8,12]. Illitic clays are reported to be more effective at trapping CO 2 from carbonate decomposition than kaolinitic clays [29].…”

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

118

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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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“…Bloating phenomenon is the result of an intense gas emission from the material during sintering with a large proportion of the liquid phase [13,14]. It is also a phenomenon that allows for the production of expanded clay aggregate [15,16]. Part of the emitted gases (CO 2 ) is the result of oxidation of unburned carbonaceous materials and thermal decomposition of carbonates.…”

Section: Introductionmentioning

confidence: 99%

Thermal studies of fly ashes expansion

Wons

Rzepa

Reben

et al. 2020

J Therm Anal Calorim

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The object of this study is to investigate the thermal properties of fly ashes from the last, farthest dedusting zone in terms of their use as ceramic masses additives. Siliceous fly ash is valuable additive to ceramic mass, which not only reduces its plasticity, but also actively affects sintering process and shapes the properties of the final material. The finest fly ash fractions are potentially useful flux materials in ceramics; however, a significant limitation in their use is due to thermal expansion/ bloating occurring during high-temperature sintering. The bloating mechanism of fly ashes was investigated in relationship to their chemical composition with the use of DTA/TG/EGA analysis as well as high-temperature microscope. Chemical and phase compositions were studied by X-ray fluorescence and X-ray diffraction. Based on the results obtained, it can be concluded. The results indicate that bloating mechanism is caused by the co-occurrence of two phenomena accompanying sintering: appearance of high amount of liquid phase and simultaneous gas release from sintered material. The dominant mechanism is the simultaneous release of sulfur (IV) oxide and oxygen as a result of the redox reaction of removing SO 3 from the vitreous phase.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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Lightweight aggregates from waste materials: Reappraisal of expansion behavior and prediction schemes for bloating

Cited by 128 publications

References 145 publications

Manufacture and performance of lightweight aggregate from waste drill cuttings

Manufacture and performance of lightweight aggregate from waste drill cuttings

Use of clay in the manufacture of lightweight aggregate

Thermal studies of fly ashes expansion

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