Generalized quality control parameter for heterogenous recycled concrete aggregates: A pilot scale case study
2019
Rangel, Caroline Santana | Toledo Filho, Romildo Dias | Amario, Mayara | Pepe, Marco | de Castro Polisseni, Gabriela | Puente de Andrade, Gabriella
Although Recycled Concrete Aggregates, RCAs, derived from concrete waste, represent a potential sustainable solution for the structural concrete production, their heterogeneous composition is a feature that still prevents their large-scale use in the construction industry all around the world.In order to find a possible existing relationship between the source of residues and the resulting RCAs characteristics, a pilot scale case study was carried out, in which approximately 20 tons of concrete waste, derived from different origins, were processed to obtain granulometric fractions from coarse aggregates to powders. The RCAs fractions, obtained using a controlled processing procedure, were then thoroughly characterized to establish quality control parameters that could lead to a classification of different types of recycled aggregate generated.The results show that the source of concrete waste strongly influences the amount of each aggregate fraction produced during processing and, aggregate properties were dependent on the waste origin. Despite this, the presented analysis demonstrated, that by evaluating a fundamental parameter such as the Attached Paste/Mortar within the RCAs, a generalized quality-control classification can be proposed for the industrial upscaling of RCAs characterization.It is believed that such a classification could promote the integral and rational re-use of these secondary raw materials in different cement based products of the construction sector.
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