USE OF FINE RECYCLED AGGREGATE AS SUPPLEMENTARY CEMENTITIOUS MATERIAL

Author(s): M.E. Sosa, C.J. Zega, G.B Coelho Dos Santos, A.A. Di Maio
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: 73-79
Total Pages: 7
Language: English

Abstract: Concrete wastes occupy up to 50% of overall construction waste. The use of those as coarse aggregate in new concrete production is a topic widely studied since some decades. The use of fine recycled aggregate (FRA) began to be important in last decades, due to a shortage of natural sand suitable for the concrete industry. In several studies, the use of FRA in concrete has been evaluated from different aspects and contradictory results can be found about its influence in fresh and hardened state properties. However, most of the researches agree with the fact taht the finest fraction of this waste (sizes smaller than 2 mm) must be discarded, considering that it is the most damaging for the properties of concrete. Nonetheless, recent studies concluded that the use of water-reducing admixtures could rectify this behaviour. Other authors found that it can be used as filler in self-compacting concrete, improving fresh state without prejudice to the mechanical performance. In this work a measurement of cementing properties by means of strength activity index of the smaller fraction of recycled aggregate obtained from crushing concrete as well as its action as filler is evaluated. From the results obtained it appears that the use of this fraction as a supplementary cementitious material is feasible.

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