Slag asphalt, a silent and sustainable paving for densely built-up areas

Important results from the project

The goal of the project was to develop product sheets for slag asphalt. The aim was to turn slag asphalt into a sought-after product in Sweden. A product sheet template has been developed, which companies can use in their efforts to commercialize slag aggregate for asphalt production. In addition, three test reports, three papers and one abstract were published. The level of awareness among all stakeholders has increased significantly concerning the unique characteristics of slag asphalt. Several types of slag are now used and/or expected to be used as aggregate in asphalt.

Expected long term effects

The increased knowledge gained from the project can be directly used by both slag producers, asphalt manufacturers and authorities. New slag asphalt products will reach the market and the produced product sheet template will facilitate and clarify the marketing. A major success factor for the project has been the broad project group. This has given many stimulating discussions and a rapid and wide dissemination of the knowledge gained at all levels simultaneously. The structured network will live on even after the project ends.

Approach and implementation

Ten different slag types were tested for aggregate properties and lab produced asphalt from all the slag types were subjected to both lab and pilot scale tests on wear resistance and to lab scale tests of stability and durability. All test results were compared to traditional asphalt. The experimental design provided a broad and in-depth knowledge of the unique properties of slag asphalt, that can be understood and used by all stakeholders at all levels. The broad-based project group and the participation in conferences has provided fast and good distribution and use of the results.