The core of this process is a Dynapac DF145CS paver with an added Dynapac CM2500 module so that two material hoppers and two screeds are simultaneously in use. The first screed applies the highly-compacted binder course. The second screed lays the wearing course – “hot on hot” – directly behind the first. The initial compaction is carried out by a roller with a low linear load.
The funnel-shaped 31-ton front hopper contains the binder material which is designed for uniform emptying without segregation. The 17-ton upper hopper, holds the wearing course material.
Considered unique to the CM2500 module is its drive system. Powered by a Deutz TCD2013 engine (118 kW), the drive system is located in front of the paver allowing the drive system to act as a counterweight for optimized balance.
To carry the module, the DF145CS paver is built with various modifications and reinforcements and special control units. The DF145CS can be used with the module for Compactasphalt paving, and without the module for conventional road paving. Several pavers can share the same module, so it is possible to alternate between Compactasphalt and conventional paving on each machine to increase paving options.
For conventional paving, screeds with gas heating can be used for working widths up to 44 feet. With Compactasphalt methods, working widths of up to 25 feet are achievable. A patented excenter adjustment lever is designed to enable the screed to be set quickly to the top, binder or base course.
Use of the Dynapac Compactasphalt road paving technology in Germany has shown reduced construction times of up to 50% and the prolonged durability of the wearing course of up to 25 years. These results have been said to reduce governmental budgets and also reduce Co2 emissions since the need for milling and repaving is reduced during the life cycle of the road, compared with the conventional paving method.