Steel Slag Aggregate
Steel slag is a by-product formed during the steel manufacturing process. It is a non-metallic ceramic material formed from the reaction of flux such as calcium oxide with the inorganic non-metallic components present in the steel scrap. The use of steel slag reduces the need of natural rock as constructional material, hence preserving our natural rock resources and reducing the need for dumping ground. This is inline with NSL Chemical's mission to maximize return while preserving the environment.
In NSL Chemicals, steel slag is processed into a construction material through a proprietary treatment method in Singapore and Malaysia plants (NSL Chemicals Ltd (Steel Slag Aggregate) and RST Teknologi Sdn Bhd respectively). Screening of the steel slag will be done to ensure the aggregate is suitable for use as construction material. Since 1993, steel slag aggregates have been used commercially in the region for road surfacing. Clients include authorities in Singapore and Malaysia for both public and private roads.
Steel slag contains significantly higher calcium oxide and iron oxide compared to granite rock. Granite rock contains high silica and alumina content and is generally hydrophilic.
The good resistance to stripping and high PSV value exhibited by the steel slag aggregates indicates that the material is more superior to natural granite as road surfacing material. The superior adhesion of the steel slag with bitumen would also minimize potential moisture damage of the steel slag mix.
The formulation of road mixes using steel slag as aggregates has shown to give better rut resistance and mechanical stability, which indicates a more lasting wearing course for the road.
In NSL Chemicals, steel slag is processed into a construction material through a proprietary treatment method in Singapore and Malaysia plants (NSL Chemicals Ltd (Steel Slag Aggregate) and RST Teknologi Sdn Bhd respectively). Screening of the steel slag will be done to ensure the aggregate is suitable for use as construction material. Since 1993, steel slag aggregates have been used commercially in the region for road surfacing. Clients include authorities in Singapore and Malaysia for both public and private roads.
Steel slag contains significantly higher calcium oxide and iron oxide compared to granite rock. Granite rock contains high silica and alumina content and is generally hydrophilic.
| Components |
Steel slag (wt %) |
Granite rock (wt %) |
| SiO2 |
<20 |
59 |
| CaO |
25 – 50 |
5 |
| FeO |
22 – 35 |
7 |
| MgO |
4 – 7 |
3.5 |
| MnO |
6 – 8 |
- |
| Al2 O3 |
3 - 9 |
15 |
The good resistance to stripping and high PSV value exhibited by the steel slag aggregates indicates that the material is more superior to natural granite as road surfacing material. The superior adhesion of the steel slag with bitumen would also minimize potential moisture damage of the steel slag mix.
The formulation of road mixes using steel slag as aggregates has shown to give better rut resistance and mechanical stability, which indicates a more lasting wearing course for the road.
Key Companies
| Product/Services | Steel Slag Aggregates |
| Facilities | Processing Plant of Slag Aggregates |
| Location | Singapore |
| Address | 26 Tanjong Kling Road, Singapore 628051 |
| Telephone | (65)-6513 6900 |
| Fax | (65)-6268 7592 |
| Product/Services | Off Site Schedule Waste Recycling Centre for Waste N 201 |
| Facilities | Processing Plant of Slag Aggregates |
| Location | Malaysia , Penang |
| Address | 2723, Lorong Perusahaan 12, Prai Industrial Estate 13800, Prai Pulau Pinang, Malaysia |
| Telephone | (60-4)-380 5080 |
| Fax | (60-4)-380 5082 |