„Ecometal Engineering” Ltd. is a proven and established producer of aggregates suitable for production of concrete and paving, landslide protection and other construction activities.
The company owns over 20 000 000 tons of slag which are processed through a special plant (made by the German company Metso-Lindemann) for treating slag from blast furnace and steel-making production.
2. Blast furnace slag
In addition, the elastic modulus of slags is times higher than that of fine-grain bound soils and natural ballasts. It should be known that not only soils but also the natural ballasts contain clay due to which, upon increase of their water content, the elastic modulus significantly decreases and, in a number of cases, drops below 300 krf/cm2 which is considered the minimum for such purposes. The use of slags allows making of smaller embankments with steeper slopes compared to those designed with natural ballasts or fine-grain soils. In that manner the volume of embankments can be considerably reduced. For that purpose the slag can be transported over longer distances and the raw material base of construction works can be extended.
Sofia is situated in one of the most adverse regions in the country in terms of climate. The natural crushed stone ballast has poor heat indices and water migration in the foundation bed is significant. That results in adverse consistence of the soils in the foundation bed, and low bearing capacity respectively. The use of slag solves these problems because it eliminates the risk of freezing, allows use of one type of material for the foundation bed and apply just one technology of laying and compaction which, in its turn, provides for shorter construction times (for better compaction of the layers their thickness should not exceed 0,4 m, and the most efficient compaction is achieved by 12 strokes of the machine, and is therefore most economical).
3. Asphalt paving construction
5. Slag wool
Slag wool is used in heat and noise insulations in the construction and industry up to +600°C. The Slag wool Application Standard is BDS 5157 - 74.
8. Cement Concrete
Converter slags are a suitable material for preparing various aggregate fractions for cement concretes including brand 300, and even some higher brands without increasing the quantity of cement. Adding of certain quantity of ash from thermal power plants to the concrete mix will have a positive effect on the mix plasticity and on the strength indices of the cured concrete. Besides, the strength accumulation kinetics between the 28th and 90th days in slag concretes is more visible compared to concretes containing stone materials.