Road Construction
-
Landfills;
For landfills with greater volume and height over 3 meters, it's possible to use it on the first layers, as long as there is a minimum coating of 2 meters, using argillaceous or sandy material over the slag released, before laying down any paving structure, due to the slag expansibility. For this application, it is recommended the LD-NP Steel Slag.
For building bases such as Telford, normally over soft soils with high levels of ground water, it is recommended the use of slag with granulometry up to 4", which starts an exothermic reaction and becomes cemented when in contact with water. This property is known as hydraulicity.
Construction work completed:
Landfill bed (initial draining layer) made in the works for doubling the Rodovia do Sol highway.
-
Primary layers for urban and rural roadways;
Primary layers for urban and rural roadways: Due to the hydraulicity, the slags present cementing properties that make them an interesting option for this application, also because of the good final quality of the coating. As a result, slags are a technically superior and economically advantageous option when it comes to primary layers. The high mechanical resistance, associated with a reduced level of wear, if compared with other materials, offer an efficient coating with low maintenance cost over time.
For this application, there is a condition for granular separation for withdrawing material over 257 mm, that is then applied over the bed of the land, dully scarified. The material shall be spread by motor-grader, compacted with soft roll and imprinted with a CM-30, bonded painting with asphaltic emulsion type RR-1C at a rate of 1.2 l/m², and over the paint spread around 5 liters per square meter of middle-sized sand and once again, the plate roll closes the gaps (anti-dust protection film). Further, it can be transformed in sub-base for paving the same street, incorporating the slag deposited there, but then with its expansion quite reduced, thus providing an excellent sub-base. For this application, it is recommended the LD NP Steel Slag and the so-called Steel Slag In Natura.
Construction work completed:
Primary layers made with ArcelorMittal Tubarão slag.
-
Storage yards / driveways and access ways to heavy cargoes;
Storage yards / driveways and access to heavy cargoes: Due to the fact that it is a resistant material and because of other characteristics already mentioned, such as cementing property, the slag is recommended to lanes that require great resistance, such as heavy traffic areas that receive heavy cargo trucks. Therefore, the utilization of slag for this application is highly recommended, as long as it is not confined and there is no coating over it. The slag should be spread, with a thickness of around 20 cm, then wetted and compacted. On top of it, there should be released a finer granulometry slag (0 to 10 mm) 10 cm thick, for filling empty spaces, and then a new sequence of rolling for the final touch. If there is the need to eliminate the dust, it can be done by imprinting with a CM-30 and afterwards a bath with RR-1C type emulsion at a rate of 1,2 l/m², releasing middle-sized sand over this emulsion and then running a sequence of soft roll. For this application, it is recommended the Slag In Natura, with granulometry up to 32 mm.
Construction work completed:
Work at the yard of BRASIL QUARIES
Work at a yard around Rodovia do Contorno highway
-
Base and sub-base for roadways;
Construction work completed:
Base and sub-base of roadways: The Steel Slags present values of CBR (California Bearing Ratio) above the ones held by the stony aggregates. Therefore, it is a material with excellent load capacity, an aspect that favors its application in bases and sub-bases, and having the possibility to be mixed with other materials (e.g. clay), thus providing an economy of material without compromising the structure of the paving.
Then the application of ACERITA® is recommended because of its reduced expansion values (lower than 3% in the PTM-130 method), which satisfy the DNIT's standards and specifications. Moreover, the thickness of these layers may be reduced because the elasticity module of the layer performed with ACERITA® is superior to the module of the stony aggregate, considering the dimensioning through ELSIN 5 method.
-
Asphaltic coating for roadways;
Construction work completed:
Runway of Vitória's airport (ACERITA® base).
Asphaltic coating of roadways: The slag can be applied directly onto the CBUQ for paving roads. The application of ACERITA® is recommended.
Work completed at TIMS (Terminal Industrial Multimodal da Serra - Serra´s Multimodal Industrial Terminal) - inside roads:
- Sub-base and base of 20 cm (90% of ACERITA® and 10% of clay).
Work completed at BRASIL QUARIES:- Reinforcement of sub-road bed (50% of ACERITA® and 50% of clay);
- Sub-base of 20 cm (ACERITA®);
- Base of 20 cm (ACERITA®).
Access to the TPS (Terminal de Produtos Siderúrgicos - Steelworks Products Terminal) - ArcelorMittal Tubarão:- Sub-base, base and CBUQ with aged Steel Slag.
-
Ducts / Cubs with rain gutter / Water outlets;.
Ducts / Cubs with rain gutter / Water outlets: The Steel Slags with expansion reduction can be utilized for making concrete pieces used in the roadways infra-structure, such as ducts and curbs. In addition, we can mention its draining properties, which allows it to be used as a draining mattress for the water outlets.
- Rock Plugs.
Siderúrgica produtora de placas de aço, aços planos, bobinas e laminados a quente.
