Page 201 - New Trends in Eco efficient and Recycled Concrete

172 New Trends in Eco-efficient and Recycled Concrete

Figure 7.1 Air-cooled blast furnace slag.

Figure 7.2 Granular blast furnace slag.

Nippon Slag Association). In Spain, 100% of produced GBS are used by the cement
industry.
BOFS, see Fig. 7.3, present a high content of Fe, so its specific gravity is above
3
3 g/cm . This type of slag is cooled slowly to cause the crystallisation and stabilisa-
tion of its components. The most widespread use is in aggregate production for con-
crete and road applications (Shi, 2004; Tossavainen et al., 2007; Das et al., 2007;
Juckes, 2003; Mahieux et al., 2009; Poh et al., 2006; Shen et al., 2009; Waligora
et al., 2010; Xuequan et al., 1999).
The two types of EAFS are presented in Table 7.1: stainless steel (EAFS-S),
Fig. 7.4 (Johnson et al., 2003; Huaiwei and Xin, 2011; Rosales et al., 2017), and
crude steel (EAFS-C) (Shi, 2004; Tossavainen et al., 2007; Barra et al., 2001;
Luxa ´n et al., 2000; Manso et al., 2006; Tsakiridis et al., 2008). The main differ-
ences lie in the SiO 2 and Fe contents. The high amount of oxide or metallic Fe
(which could not be recovered) gives the EAFS-C, Fig. 7.5, a density which is