Road surficing progresses
In 1930, the first stretches of road in Finland were paved with asphalt.
At that time, Lemminkäinen introduced hot mix asphalt, a mixture of mineral aggregate and bitumen, laid hot and then compacted. It was durable enough to be used on carriageways.
After the war, Lemminkäinen assumed leadership of the Finnish asphalt paving market and, in the early 1950s, the asphalt business became the company’s largest business segment.
The company set up a research laboratory in 1948 with the objective of developing surfacing and paving materials.
Research, training, study visits abroad and developing the organisation were in the foreground as Lemminkäinen’s operations were improved in the 1950s. The number of vehicles on the roads was increasing steadily and more and more roads received a new paving. In 1959, Lemminkäinen completed the first paved road between two major Finnish cities, Helsinki and Lahti. The company branched out into earthwork business.
Specialty products and research projects
Lemminkäinen’s laboratory had developed specialty products, such as surface materials for bridges and stadiums, as well as bitumen and rubber bitumen products. In the 1960s, the laboratory focused on the quality control of asphalt products. In the ‘70s, the laboratory started to explore the potential of asphalt reuse.