Industrial slag use in geotechnical engineering: slag in the geotechnical engineering project

摘要

The use of industrial slag has for decades been based on experience with no dimensioning instructions being available until the 1990's. Attention was not paid to the systematic development of slag before the late 1980's, at which point the use of air-cooled blast-furnace slag was so extensive that there was an evident need for drawing up instructions in order to avoid structural problems possibly arising from its incorrect use. The first set of instructions were completed in 1989, accompanied by the introduction of new applications particularly for the use of granulated blast-furnace slag both in structural road layers and in stabilising the base course. The new applications and the stricter technical requirements placed on the products were one reason for launching the five-year "Slag in geotechnical engineering" project. According to the aim set for the project, design, dimensioning and construction instructions should be drawn up for all the slag produced at the Rautaruukki Group's works in Finland with regard to their use for earthwork and road construction purposes. To achieve this aim, the project was divided into three sub-fields, that is the use of slag 1) in structural road layers, 2) as a binding agent in stabilising structural layers and 3) as a binding agent in mix and deep stabilisation.