Incorporation of used cooking oil in the manufacture of lightweight expanded clay aggregates
DOI:
https://doi.org/10.24215/26838559e045Keywords:
clay, materials, ceramics, LECA, circular economyAbstract
Lightweight expanded clay aggregates (LECA) are ceramic materials produced from clays and other materials that during heat treatment generate gases that are trapped in the aggregates causing their volume to increase. This bloating process generates a porous structure and a lightweight material, which makes it very versatile for different applications in civil engineering and/or environmental intervention solutions. Incorporating waste from other production processes as raw materials for LECAs that release gas during thermal processing is a further step towards closing production cycles and approaching them from a circular economy perspective.
In this work, LECAs were made from a local clay and cooking oil at laboratory scale and the thermal behavior during processing of these materials, their microstructure, morphology, degree of expansion, density, porosity and water absorption were evaluated.
The results confirm the feasibility and provide the basis for the conceptual engineering in the manufacture of LECA using the proposed strategy. They also permit the establishment of criteria for the processing of these ACLs in terms of the suitability of the starting materials, the formulation ranges and the definitive thermal treatments.
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