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Intro

Air-Cooled Blast Furnace Slag (ACS)

Air-Cooled Blast Furnace Slag (ACS) is produced when molten blast furnace slag is allowed to cool slowly under ambient air conditions. Unlike GBFS, this slower cooling process results in a crystalline, dense, and hard material with excellent mechanical properties.

Sample of air-cooled blast furnace slag: grey grains and small lumps

Technical Identification

ACS is primarily used as a high-performance aggregate in construction and civil engineering applications. Its angular shape, high density, and resistance to wear make it a reliable and sustainable alternative to natural aggregates in road construction, drainage systems, and structural fill.

EC Number: 266-002-0
CAS Number: 65996-69-2
EINECS Number: 266-002-0
EC Name: Slags, ferrous metal, blast furnace
Open rail wagon loaded with air-cooled blast furnace slag

Chemical composition and properties of ACS

Origin: Ukraine

CaO:> 39%
SiO₂:< 42%
Al₂O₃: < 12%
MgO: < 8%
Fe₂O₃: < 7%
Moisture: < 8%
Granulometry: 0 – 20 mm

Delivery Methods: Rail, River, Maritime

Uses

Key Applications

Air-cooled blast furnace slag (ACS) is an extremely suitable material for use as a construction aggregate in bound or unbound form. It is actively used in road construction and concrete production.

Road base and surface course aggregate
Railway ballast
Drainage and filter layers
Structural and engineered fill
Concrete aggregate