Accelerators for the reaction of steelmaking slag with water

A slag based binder comprising or consisting of

• a) at least one steelmaking slag,
• b) at least one accelerator for the reaction of the steelmaking slag with water, the accelerator being selected from the group consisting of alkanolamines, reducing agents, sugars, sugar acids, carboxylic acids or their salts, amino acids or their salts, sulfamic acid, glyoxal, acetylacetone, pyrocatechol, nitrilotri(methylphosphonic acid), etidronic acid, mineral salts, or mixtures thereof,
• c) optionally a second slag which is different from a),
• d) optionally at least one co-binder,
• e) optionally further additives different from b).

A construction material comprising or consisting of (in each case relative to the total dry weight of the construction material)

• a) 5-95 w %, the slag based binder comprising or consisting of
• a1) at least one steelmaking slag,
• a2) at least one accelerator for the reaction of the steelmaking slag with water, the accelerator being selected from the group consisting of alkanolamines, reducing agents, sugars, sugar acids, carboxylic acids or their salts, amino acids or their salts, sulfamic acid, glyoxal, acetylacetone, pyrocatechol, nitrilotri(methylphosphonic acid), etidronic acid, mineral salts, or mixtures thereof,
• a3) optionally a second slag which is different from a1),
• b) 5-95 w % of at least one aggregate,
• c) 9-90 w % of at least one co-binder, the co-binder being different from the slag based binder a) and the co-binder being selected from the group consisting of cement, gypsum, lime, calcined magnesia, caustic magnesia, alumina, latent hydraulic binders, and/or pozzolanes,
• d) 0-10 w % of further additives, and
• e) optionally water in an amount to realize a mass ratio of water:dry constituents between 0.1-0.6.