Properties of Building Materials Gained from Wet Processed Crushed Concrete Fines

Title: Properties of Building Materials Gained from Wet Processed Crushed Concrete Fines
Author(s): Weimann
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: 133 - 141
Total Pages: 9
Nb references: 25
Language: English

Abstract: Although a large proportion of building rubble is already being recycled, most recycling
applications, e.g. in roadbed foundations, can be considered as downcycling. This study is
aimed at improving the material properties of crushed concrete fines by wet treatment, using a
jig for density separation. Trial runs in a pilot plant with a flow rate between 0.45 and 0.65 t/h
were conducted with two different materials (A and B). The materials were separated into
heavy fraction, light fraction and finest fraction. Laboratory tests and tests for building
materials were carried out on the output fractions and on the input materials.
Laboratory tests showed an improvement of material properties such as loss by washing
and content of binder matrix as well as water absorption for both materials A and B. The tests
for building materials on mortar specimens showed that strength properties of specimens
containing crushed concrete fines (heavy fraction) of type A were improved by wet treatment,
but not for test specimens of material type B.
Strength tests on concrete showed that a replacement of natural aggregates with wet-treated
concrete fines up to 50 % had little effect on compressive strength, while untreated material
exhibited a clearly lower compressive strength.

Online publication: 2004-09-29
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143756.015