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A Case Study on the Variation in the Quality of Mortars Using CDW Recycled Sands



Title: A Case Study on the Variation in the Quality of Mortars Using CDW Recycled Sands
Author(s): Miranda
Paper category : conference
Book title: International RILEM Conference on the Use of Recycled Materials in Building and Structures
Editor(s): E. Vázquez, Ch. F. Hendriks and G.M.T. Janssen
Print-ISBN: 2-912143-52-7
e-ISBN: 2912143756
Publisher: RILEM Publications SARL
Publication year: 2004
Pages: 483 - 492
Total Pages: 10
Nb references: 10
Language: English


Abstract: In order to stimulate the production of recycled aggregates from construction and
demolition waste (CDW) in Brazil, research should be carried out on processes capable of
providing reasonable standard quality for such materials, without great investment costs, and
also to allow an increase in applications of less structural importance, as is the case of
masonry and plastering mortars, very traditional in the country.
This work presents a case study of the quality of CDW recycled sand for mortars based on
the visual classification of the nature of the waste and the control of its fine fraction. Upon
watching the production in a recycling plant, in Socorro, São Paulo State, for one month 20
CDW samples were collected, with a predominance of red ceramics, which underwent the
process of fine fraction removal through washing in a 0.15 mm sieve. Several characterization
tests were carried out on the aggregates and on the mortars thus produced.
As the visual control technique on the CDW nature is concerned, it can be stated that it was
not enough to obtain aggregates considered homogeneous, even though the town chosen is
quite small and the building process is predominantly constituted by masonry walls made of
bricks from local factories. As for the control of fine aggregate content, it is necessary to find
out another way of washing aggregates in order to reduce the range of variation on this
property.
The results also show that the absorption of the aggregate and its material finer than 75 µm
are the main aggregate properties that can cause variability in the mortar properties.


Online publication: 2004-09-29
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143756.054