Kalltillverkad asfaltbeläggning

Torbjörn Jacobson

An overview of current knowledge concerning cold asphalt pavements in Sweden and other countries is presented to form a basis for further development of the cold mixing technique as an environmentally adapted asphalt pavement. The cold mixing technique has been used periodically in Sweden for a number of years, but only on roads with little traffic, in both wearing and road base courses. In recent years, emulsions based on harder bitumen have been used to manufacture asphalt pavements with higher performance. This study investigates cold mixed asphalt concrete based on harder bitumen in the road base layer on roads with heavy traffic where hot mixed asphalt has traditionally been used. The construction of several test sections and initial condition evaluations of the test sections are presented. It was found in this limited study that cold mixed pavements are an effective way to reduce environmental impact through lower carbon dioxide emissions and energy consumption during the manufacture and laying of the cold compound. Development is however needed in order to achieve systematic use of cold mixed asphalt with good function characteristics on roads with heavy traffic.



Open seminar with Mistra SAMS international scientific advisory...

Mistra SAMS international scientific advisory panel (ISAP) is visiting Stockholm, and the program will host an open seminar where the panel members will give talks in their area of expertise.

ERPUG 2017

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. 



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. 


Crash testing bicycles at VTI

For the first time single bicycle crashes have been simulated at the VTI crash safety laboratory.


A case study exploring firefighters’ and municipal officials’ preparedness for electrical vehicles

A VTI-study presents a social perspective on new vehicle technology. It explores the self-reported preparedness of the fire departments (i.e., rescue services) in Sweden’s three largest cities regarding rescue operations involving electrical vehicles (EVs).


Pioneering research on and about bicycles at VTI

Under what circumstances might cyclists lose tyre grip? What actions could then be taken to prevent a crash? VTI is currently developing a theoretical model of the behaviour of bicycle tyres during braking and steering in different situations and on different...


Virtual pedestrians create efficient stations

If more people are to choose sustainable travel, then the public transport stations of the future must be designed so that pedestrians can get where they are going quickly, without congestion or queues. The Swedish Road and Transport Research Institute (VTI)...