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Thursday, 18 July 2019
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Raw materials & technologies, Raw materials, Coatings binders

Basic oxygen furnace slag influences the bonding strength of asphalt binder

Wednesday, 18 June 2014

Research on using Basic Oxygen Furnace (BOF) slag as a novel aggregate in asphalt pavement has benefits both in environment and economics.

The bonding behaviour between slags and asphalt binder is important
Source: Kadmy - Fotolia.com

The bonding behaviour between slags and asphalt binder is important
Source: Kadmy - Fotolia.com

BOF slag is one of in the steel slags, which are by-products in steel industry. Currently there is lack of effective ways to reuse it. It has caused various environmental issues such as water pollution, soil pollution and shortage of storage spaces. The bonding behaviour between slags and asphalt binder is one of the most important properties to ensure a durable BOF slag based asphalt pavement.

BOF provides better asphalt stripping resistance

In a work, the bonding behaviour between BOF slag and asphalt binder was studied by Chinese researchers. X-ray diffraction (XRD) was first conducted to understand the physical and hydration characteristics of BOF slag. A modified boiling water test and a self-designed tensile test were then used to quantify the bonding behaviour. The moisture resistance of the bonding behaviour can be also investigated with the modified boiling water test. The results of the boiling water test indicated that the BOF slag, firmly covered with hydration products, has the potential to protect the asphalt binder from being stripped by boiling water. The self-designed tensile test result illustrated that BOF slag had better bonding strength than the values of basalt and granite aggregates.

The study is published in: Construction and Building Materials, volume 64, 14 August 2014, pages 60-66

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