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Fundamental Analysis of the Machining Process of a Composite Material Made of Concrete and CFRP with Diamond Grinding Tools

Although concrete is able to bear high compressive loads, its possibility to withstand tensile loads is very low. Hence, in construction elements steel bars are embedded as reinforcement. To avoid corrosion, a thick concrete covering of the steel bars is necessary. The new composite material made of carbon fibre reinforced plastic (CFRP) and high-performance concrete offers an alternative possibility and provides an opportunity for thinner and lighter construction elements. Advantages of the new construction material compared to reinforced concrete are, among others, corrosion resistance, conserving resources and new possibilities in the design of constructions.

According to recent developments in the construction industry and existing research programs it can be assumed that the amount of CFRP reinforced concrete elements will increase in the next few years. Assuming that each construction will be rebuild or demolished during its life cycle, there is a need for efficient machining of this construction material. As the impact of the CFRP elements on the machining process have not yet been researched, this project will analyse the basic interrelationships in machining based on model experiments. Metal bonded diamond tools are used for machining the new composite material as is customary for the machining of concrete. The combination of the different materials with their inhomogeneous material properties places particular demands on the development of diamond tools for the machining of the composite material carbon concrete.

The research project comprises an analysis of the material separation of the new construction material by diamond tools as well as the mechanisms acting through the phase change between CFRP and concrete. Scratch tests are a fundamental testing method to understand the general mechanism of material removal. Therefore single grain scratch tests will be carried out to analyse the elementary interdependencies of the machining process. The knowledge of single grain scratch tests and multi grain single segment tests can be used for the optimisation of the machining process of the multiphase material CFRP reinforced concrete. Based on the quantitative and qualitative results of single grain scratch tests and multigrain single segment tests, process models of core drilling processes will be generated. Hence, these investigations constitute the fundamental basis for the development of efficient diamond tools for the machining of CFRP reinforced concrete.

Levels of analysis of the research project “Machining Process of CFRP Reinforced Concrete”


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Location & approach

From A1

Take exit Kreuz Dortmund/Unna to merge onto A44 toward Dortmund, which changes into the B1. Exit Dortmund-Dorstfeld toward Universität (onward see map).

From A 45

Exit Dortmund-Eichlinghofen toward Universität (onward see map).

Alternatively, you can calculate the route here: Google Maps.


Arrival by Deutsche Bahn to Dortmund or Bochum central station.

From Dortmund central station, take the S1 city train in the direction of Düsseldorf to the "Dortmund Universität" station (7 minutes journey time).

From Bochum central station, take the S1 city train in the direction of Dortmund to the "Dortmund Universität" station (14 minutes journey time).

The city train runs regularly every 20 minutes in both directions.  From the city train station, take the Skytrain (S-Universität stop) to the Campus Süd stop (1 stop, runs every 10 minutes).

From Dort­mund Airport

By taxi to TU Dortmund University, Campus South (approx. 20 min and 30 €, see  Map)

From Düsseldorf Airport

Take the city train S1 in the direction of Dortmund to the "Dortmund-Universität" station (approx. 60 min). From here, take the Skytrain in the direction of Campus South or Eichlinghofen (runs every 10 minutes and takes approx. 3 min.).


The H-Bahn is one of the hallmarks of TU Dort­mund Uni­ver­sity. There are two stations on North Campus. One (“Dort­mund Uni­ver­si­tät S”) is directly located at the suburban train stop, which connects the uni­ver­si­ty directly with the city of Dort­mund and the rest of the Ruhr Area. Also from this station, there are connections to the “Technologiepark” and (via South Campus) Eichlinghofen. The other station is located at the dining hall at North Campus and offers a direct connection to South Campus every five minutes.


The facilities of TU Dort­mund Uni­ver­sity are spread over two campuses, the larger Campus North and the smaller Campus South. Additionally, some areas of the uni­ver­si­ty are located in the adjacent “Technologiepark”.

Site Map of TU Dort­mund Uni­ver­sity (Second Page in English).