Biodeposition of Diatoms in Recycled Aggregates

This work studies the behaviour of diatoms in artificial culture environments and analyses the biodeposition of diatom frustules in different sizes of mixed recycled aggregates. In order to be able to use this biodeposition as a surface treatment and improve the properties of this material for its effective use in recycled concrete. Surface analyses show that the density of diatoms in biofilm formation depends on the aggregate size, being better in smaller aggregates of 4–6.3 mm diameter. However, the diversity of diatoms is higher in aggregates with fractions of 8–12.5 mm. The combination of these tests demonstrates that diatom biodeposition is feasible in artificial environments for possible use as a protective surface treatment of cement-based building materials.