个人简介
Dr. Ulf Sandberg
Dr. Ulf Sandberg
Swedish National Road and Transport Research Institute (VTI), Sweden
标题: Improving double-layer porous asphalt pavements by using steel slag in the upper layer
摘要: 
In Europe, porous asphalt concrete pavements (PAC) are commonly used to reduce traffic noise. Especially the double-layer type (DPAC) provides substantial traffic noise reduction. Unfortunately, PAC pavements compared to dense asphalt pavements have reduced acoustic longevity; the main reasons being clogging by dirt of the pores and voids and by more ravelling.
Ideally, one would like to increase the voids content and the width of the pores in order to increase the noise reduction and the time it takes before the voids and pores get too clogged to provide sound absorption and drainage. But this has a cost in terms of technical durability and lifetime; such as increased ravelling. Therefore, an optimum construction is sought, involving (for example) choice of binder and grading of the aggregate (particle sizes and their proportions).
Steel slag is a biproduct of steel manufacturing for which one would like to find uses which are economical and environmentally friendly. One such use is to replace the stone aggregate in asphalt pavements with steel slag. The slag often has the advantage of being bound together more strongly than stones. Potentially, this may be exploited as increasing the voids content while still have acceptable adhesion in the mix. Another potential is that the slag may be less worn by the tyres than common stone aggregates; in this way reducing the amount of particles worn-off the pavement, part of which would get stuck in the voids and part of which would be spread in the air. By choosing the right kind of slag, combined with the right type and amount of binder, these wear effects my improve both noise and air particle pollution.
This paper examines the acoustic and technical performance of DPAC pavements in Sweden in which one part was constructed with steel slag in the top layer instead of the common stone aggregate on a motorway. The indications so far suggest that initial noise reduction of the steel slag section was slightly less than that of the conventional stone aggregate main part of the road but that the deterioration with time is slower and thus the overall performance would be better.
简介: 
Mr Ulf Sandberg has a PhD in Measurement Technology from Linkoping University in Sweden. He has been employed at the Swedish National Road and Transport Research Institute (VTI) since 1974, with current position as Senior Research Leader (parttime). During 6 years he was simultaneously an Adjunct Professor in Tyre/Road Noise in the Acoustics group at Chalmers University of Technology in Sweden. 
Sandberg has worked with various subjects in tyre/road interaction, most notably with noise emission and rolling resistance. His research interests include most aspects of the tyre/road interaction but often focused on low noise pavements. 
Dr Sandberg is probably best known for authoring the 640-page Tyre/Road Noise Reference Book (with Prof Ejsmont in Poland) which has been called a "bible" for everybody working with noise from the tyre/road interaction. Apart from working mainly in Swedish and international European projects, Dr Sandberg has been or is involved in research projects in USA, Japan, New Zealand and China. He has been a guest researcher in USA, Australia and New Zealand.
As past Convener of three ISO working groups, Sandberg has been responsible for development and acceptance of a considerable number of international standards or other ISO documents produced under the ISO Acoustics/Noise committee. Some of these have been implemented in EU and UN/ECE regulations, in European and in ASTM standards.
Dr Sandberg has received Lifetime Achievement Awards from the Swedish Acoustical Society, the Tire Technology International and the International Friction Pavement Association.