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Quality improvement of mixed and ceramic recycled aggregates by biodeposition of calcium carbonate

2017; Elsevier BV; Volume: 154; Linguagem: Inglês

10.1016/j.conbuildmat.2017.08.039

1879-0526

Julia García-González, Desirée Rodríguez-Robles, Jianyun Wang, Nele De Belie, Julia Mͣ Morán-del Pozo, M. Ignacio Guerra‐Romero, Andrés Juan-Valdés,

biodegradable polymer synthesis and properties

This research focuses on improving the quality of mixed and ceramic recycled aggregates by microbially induced carbonate precipitation (Bacillus sphaericus). The precipitation contributed to a weight increase and unleashed a waterproofing response. The roughness of the ceramic particles created a more uniform layer compared to natural or concrete particles. For the concrete fraction, which had a higher macroporosity, the consolidation effect was more pronounced. High ceramic content aggregates profited from a greater biodeposition, leading to a remaining amount of precipitates after sonication which was still greater than in cementitious materials. Pore-filling effect was detected by SEM, supporting the waterproofing result.