Reuse of Waelz Slag as Recycled Aggregate for Structural Concrete

Title: Reuse of Waelz Slag as Recycled Aggregate for Structural Concrete
Author(s): Sorlini
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: 1086 - 1094
Total Pages: 9
Nb references: 21
Language: English

Abstract: The Waelz slag was characterized for the main physical (grain size distribution, water
absorption and density) and chemical (chemical composition, alkali reactivity, leaching
behaviour) properties to evaluate its suitability for final reuse in concrete. Eventually, different
concrete mixtures were produced with the following characteristics: 7 mixes with a cement
content of 300 kg/m 3 (Type II/A-LL, CEM 32.5R according to EN 197-1), water/cement=0,54,
200-400-600 kg/m 3 of Waelz slag; 7 mixtures with 250-300-350-400 kg/m 3 of cement (Type
II/A-LL CEM 42.5R), water/cement=0,52, 200-400-600 kg/m 3 Waelz slag.
The concrete mixes were characterized by conventional physical-mechanical (slump, setting
time, compression, tensile and flexural strength, as well as modulus of elasticity) and leaching
tests (following the Italian Standard for waste reuse). A very good compressive strength (similar
to conventional concrete) was achieved after 28 days of curing with values of about 25 MPa and
35-40 MPa, for 32.5R and 42.5R cement respectively (independently from waste dosage). As far
as tensile and flexural strength are concerned, concrete with Waelz slag is similar or even better
than the conventional one, while the modulus of elasticity is reduced from 10 to 40%.
Finally, the environmental acceptability is complied in all concrete specimens since metals
leachability is lower than the Italian Standards for wastes reuse.

Online publication: 2004-09-29
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143756.119