2003 and by order of the Federal Ministry of Transport, Building and Urban development (BMVBW), the research topic "Suitability of brick-rich recycled building materials for base courses without binder" was accomplished at the Ruhr-university Bochum. Based on laboratory tests of recycled building materials consisting of concrete, an increase of brick concentration is recommended up to 30M-%. A practicable method for detection and separation of hard and soft burnt bricks couldn’t be found, i.e. a classification of brick material including plaster and mortar rate is not possible. It’s evident that the permanently present materials, plaster and mortar, degreed considerably the quality of the RC-Material. Fundamentally the grain strength, the freeze-thaw-alternation, the water absorption and the water permeability are negatively hindered. The proposition of the increasing of the brick concentration was accepted by the BMVBW. This was included in the new technical guideline „Technische Lieferbedingungen für Gesteinskörnungen im Straßenbau, TL Gestein-StB”. There are currently no practice experiences for the realized laboratory tests.

The findings of the current research should be confirmed under applicative traffic exposures so that the brick rich RC-material, based on the new technical guideline and the European standards, reach the usable maximal quality. This is why, on 2006, a survey line was created as part of a regular construction project, by-pass “Seelow Los 6”. The Goal is to find out with practical long time expiriences, the base courses quality as well as the road use durability, with an increase of the brick rate up to 40 M.-% in base courses without adhesive agent. The staggers of the brick rate result in the anti-freeze layer and the ballast substructure of 10, 20, 30 and 40 M. -% in different sections of the test track “Seelow Los 6”. The function of the line section as a temporary connection part of the Federal traffic grid deployment in Brandenburg (expected deconstruction of the section „Los 6“at the correspondent moment) enabled the future collecting of the unbound layers and their systematic examination. The expected traffic load and the size of the construction layers, according to RStO 2001, allow to visualize the explicit exposure of the unbound base courses.

The "Brandenburg University of Technology, Cottbus" was commissioned to accompany the project of the survey line for brick-rich RC material in unbound base courses at the by-pass “Seelow Los 6”.

Kathleen Lehmann