Author(s): Jianzhuang Xiao, Guanzhen Zhang
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: 27-36
Total Pages: 8
Language: English

Abstract: Recycled concrete containing recycled aggregates not only consumes larger amount of water, but also has lower mechanical properties and durability when compared with normal concrete. Coupled with the strength degrees and source of parent concrete, all these shortcomings limit recycled aggregates’ further application. Modification of recycled aggregates has become a prominent technology for solving such problem. This paper presents current modification methods, mainly include: (1) physical technology, its basic idea is to remove the waste cement paste adhered to recycled aggregates; (2) chemical technology, carried out by immersing recycled aggregates in different kinds of chemical grout; (3) carbonation technology, when newly collected crushed aggregates are put into atmosphere with high CO2 concentration, the adhesive cement paste will achieve higher properties after carbonation reaction. At last, we also consider the modified gradation of recycled aggregates. The comparisons and evaluations of these methods are summarized in detail, conclusions are put forward and several problems concerning modification need to be considered for further research and application are proposed and discussed.

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

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