Slaggasfalt, delrapport C: slitage och bildning av inandningsbara partiklar (PM10)


The purpose of the project was to investigate whether the use of slag asphalt in urban and high traffic areas can reduce dust problems during the winter. Wear measurements in PVM presents an unclear picture. Test of particle formation and wear characteristics have been performed in the Road Simulator at VTI on a SMA8 pavement with slag from Ovako Bar. Although an earlier test in the road simulator (PVM) on an SMA11 pavement with the same slag materials are included in this report. Wear measurements in PVM presents an unclear picture probably because of the slag used contained more steel residues than normal slag, resulting in a very uneven surface with protruding sharp steel pieces after some wear of the surface, which in turn led to increased stud protrusion during measurement and the increased wear of the pavement surface. In tests with conventional asphalt stud protrusion is reduced under wear test. It is therefore very difficult to compare the wear measurement on this slag asphalt with results from previous runs on other types of asphalt wearing courses. Because of the unclear development of wear the overriding aim of the investigations could not really be achieved. Wear properties of the SMA8 with slag tested according to the ‘Prall’-method (EN 12697-16) show very high/good abrasion resistance. The tests in the road simulator has also shown that particle formation from SMA8 slag asphalt, measured as PM10, is at the same level as previously tested SMA11 with slag and at similar level than most asphalt wearing courses made from natural aggregates. The particle mass is dominated by particles at two modes, 3 and 6 µm, while the number concentration is dominated by ultrafines at about 20 nm. SMA8 with slag give rise to a much lower number concentration of ultrafines at about 20 nm than the previously tested asphalt pavements and previously tested SMA11 with slag. Element analysis of PM10 shows a distribution very similar to that of the previously tested slag pavement in 2013. Ca, Fe and Si are principal elements in the size fraction 1–10 µm, followed by Al, Mn, Cr and K. Scanning electron microscopy reveals that PM10 particles have angular, grainy and flaky shapes as well as some needle shaped and exhibit typical features of mineral and metallic fragments. Particles down to a couple of 100 nm were observed in the SEM pictures.



International Conference on Electric Road Systems starts today

Electric Road Systems (ERS) is a relatively new concept with many initiatives on the way. To learn from each other and stimulate new collaborations the Swedish Research and Innovation Platform for Electric Roads arranged the first international conference...


Same survey of road users’ attitudes in 50 countries

At the Road Safety on Five Continents Conference, RS5C, one entire session presented a large survey of road users' attitudes in 38 countries. Results show large differences between countries in many areas, both regarding behavior and attitudes. A new survey...


Good results with alcohol interlock program according to Swedish study

An alcohol interlock program makes it possible for drink driving offenders to continue their everyday lives. In a Swedish study most of the participants were satisfied with the program and experienced improved health. They also reported drinking alcohol more...


Traffic safety in the spotlight

Today the Conference Road Safety on Five Continents (RS5C) opened in Jeju Island, South Korea. More than 220 participators have come from all over the world to present findings and learn about traffic safety. Dr. Young Tae Kim, Secretary-General of the...


VTI will develop simulators for ambulance staff

VTI has initiated a pilot study for paramedics with the Centre for Teaching & Research in Disaster Medicine and Traumatology and Linköping University. The aim is to give ambulance staff the opportunity to practice critical medical tasks in a moving vehicle in...


Unique electrified road opens in Sweden

The world’s first electrified road recharging the batteries of cars and trucks while driving opened in Sweden. The Swedish Minister for Infrastructure, Tomas Eneroth, was at the formal inauguration of the electrified road on April 11, 2018. VTI is one of 22...