Production of artificial aggregates from steel-making slag: Influences of accelerated carbonation during granulation and/or post-curing
151 citations recorded by the source corpus.
Abstract Accelerated carbonation is envisaged to be a significant curing method for the development of cement-free artificial aggregates. In this paper, two accelerated carbonation approaches, applied during granulation and post-curing respectively, are investigated for their influences on the properties of the aggregates made by 100 % basic oxygen furnace slag (BOFS). The result shows that carbonation during post-curing significantly enhances the overall properties of the granulated BOFS, such as increasing the strength by 220 %. In contrast, synchronized carbonation applied simultaneously during the granulation process yields considerable property degradation, though a CO2 uptake of ∼16 % can be achieved. It contradicts with the common understanding that carbonation is beneficial to the strength enhancement. This is because synchronized carbonation of BOFS is found to release extensive heat and vaporize a great amount of bridging water for agglomeration, thus causing a very loose structure. In general, synchronized and post-granulation carbonation result in two notably different influences on the properties of BOFS aggregates. The integrated approach of granulation and post-granulation carbonation creates a promising cement-free alternative to the local natural aggregates; while the synchronized carbonation shows significant potential for the production of lightweight aggregates.
Subfields: Civil and Structural Engineering, Environmental Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/909b1bf1747a7ea4beb11ea496a9bbe9493d2142