Stainless Steel Slag as Aggregate in Hot Mix Asphalt Pavements

Title: Stainless Steel Slag as Aggregate in Hot Mix Asphalt Pavements
Author(s): De Bock
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: 1105 - 1114
Total Pages: 10
Nb references: 4
Language: English

Abstract: This contribution describes the Belgian experience with the use of stainless steel slag as
aggregate in hot-mix asphalt for road construction.Slag from stainless steel production is a stony material with good mechanical properties. Earlier research has shown that it can be used as aggregate in construction blocks and in
road construction. However, because of the rather high concentrations and leachability of the
heavy metals chromium and nickel and also of fluorine, Flemish environmental legislation
makes it mandatory to bind such slag with a stabilizing agent (like bitumen) in order to bring
the leaching of those elements down to an acceptable level.Laboratory studies have demonstrated the capability of this slag to be used as aggregate in a conventional type of hot-mix asphalt. After breaking and sieving, the slag is available in
two sizes: 0/7 mm and 7/20 mm. Both sizes are used as an aggregate for the mixture, with an
addition of natural sand. Attention should be paid to some special characteristics of the slag - like higher density,
porosity and surface roughness, which result in higher bitumen consumption by the asphalt
mixture. Trial sections of road pavements with stainless steel slag have shown good results for the
mechanical stability of the mixture and for resistance to rutting and polishing. They
demonstrate the possibilities for successful recycling of stainless steel slag as aggregate in
hot-mix asphalt mixtures for road construction.

Online publication: 2004-09-29
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143756.121