PRELIMINARY CHARACTERIZATION OF EXCAVATED SOILS COLLECTED AT A CDW LANDFILL OF SÃO PAULO CITY

Author(s): Karen Kataguiri, Maria Eugenia Boscov, Cláudia Echevenguá Teixeira, Sergio Cirelli Angulo
Book Title: III Progress of Recycling in the Built Environment
Editor: I. Martins, C. Ulsen and S. C. Angulo
e-ISBN: 978-2-35158-158-2
Publisher: RILEM Publications SARL
Publication year: 2015
Pages: 213-221
Total Pages: 9
Language: English

Abstract: A case study was conducted to characterize materials received in a construction and demolition waste (CDW) landfill located in the Metropolitan Region of São Paulo. The study consisted in: systematic collection of 35 samples of materials received in the landfill, random selection of 8 among the 35 samples, sample mass reduction, preliminary visual classification (predominantly soil or CDW) and basic geotechnical characterization. 38% of the samples can be classified as excavated soil using particle size distribution and visual classification criteria, whereas 62% of the samples were classified as mixtures of excavated soils and other CDW types (especially cement based materials). Samples classified as mixtures soil-CDW were divided in fractions of different grain size intervals and further analyzed by microscopy to estimate the percentage of soil grains and cement based material. Results suggest that at least 49% of the material passing the 2 mm sieve could be recovered as soil; however, this fraction of the samples (particles with diameter  2 mm) are not very significant compared to the bulk sample: most of the material received is still a mixture of excavated soils and other CDW mineral types. Therefore, the need of a proper segregation of these CDW types is necessary at construction building sites, prior to final disposal, to ensure optimal recovery.

Online publication: 2015
Publication Type: full_text
Public price (Euros): 0.00