Slaggasfalt, delrapport A: ballastegenskaper och slitageegenskaper enligt Prall


There is great interest in the steel industry to increase the use of slag by constantly seeking new application opportunities. This project has focused on slag used as aggregate in asphalt pavement, where the most positive characteristics are the good adhesion and noise reduction properties, as well as good stability and durability. One aim of the project is to make the slag asphalt to a natural choice on roads in urban areas, where it is complicated because of congestion to do maintenance work and where high strength e.g. roundabouts, traffic lights, et cetera. Therefore, one wishes, and where noise and particle formation due to traffic is a problem. A second objective is to increase the material economy of society by using slag, produced in conjunction with steel instead of other materials whose properties often results in asphalt with poorer performance than Slag Asphalt. In this first interim report, results of about 10 different slag types are summarized, with respect to: 1. ballast properties, 2. wear properties according to Prall (EN 12697-16, Method A). By improving the process technology and manage the slag material with regards to crushing, magnetic separation and sorting etc. of the slag producer, the quality become better and smoother and materials become valued for road construction. Slag materials were sent to VTI from each supplier. VTI performed all testing. Aggregates Testing of the various slag materials have been performed according to European standards for different properties like abrasion resistance, fragmentation and shape: · EN 1097-1 resistance to wear (micro-Deval). · EN 1097-2 resistance to fragmentation (Los Angeles Value), · EN 1097-9 resistance to abrasion of studded tires (Nordic Ball mill), · EN 933-3 particle shape – Flakiness index. For Prall tests, asphalt specimens of type ABS11 (asphalt wearing course), where made. The fine fraction (0-4 mm) consisted of granite materials and all materials >4 mm consisted of the respective slag material. 9 out of 10 slag types investigated are REACH registered products.



Shipping and the environment – research meets reality

Centre for Transport Studies (CTS) in co-operation with Ports of Stockholm invite you to the seminar Shipping and the environment – research meets reality.




The five-year anniversary of European Road Profile Users' Group (ERPUG) Forum will take place at Ramboll head quarter, Copenhagen, Denmark October 19-20, 2017.


Self-driving buses in Sweden next year?

A self-driving, fossil-free bus. This idea might become reality through a forthcoming collaborative project involving the Swedish National Road and Transport Research Institute (VTI), Linköping University and several other participants. The project group aim...


New climate-proof solutions for hard surfaces in cities

High-density road infrastructure that emphasise maximum durability and minimum maintenance create inflexible systems, which put increased stress on urban trees and lead to increased risk for flooding. Over the past five years, the ‘Climate-proof solutions for...


VTI is preparing for automated vehicles

Automation of traffic systems will lead to major changes. The European Union’s (EU) CoEXist research project began in June 2017 with the aim of preparing cities and road operators for the introduction of self-driving vehicles. The Swedish National Road and...


Vehicle Driver Monitoring: sleepiness and cognitive load

To prevent road crashes it is important to understand driver related contributing factors, which have been suggested to be the critical reason in 94 per cent of crashes. The overall aim of the project Vehicle Driver Monitoring has been to advance the...


Tomas Svensson new director-general

Tomas Svensson was today appointed Director-General of VTI. Tomas has been acting Director-General since January 2017.