In Germany the properties of textile concretes have been investigated intensively for more than 20 years. At first, essentially textiles on the basis of polypropylene or polyvinyl alcohol were used as reinforcement. As these polymers have only a low modulus of elasticity they can lead to relative large crack widths in the cementitious matrix. Therefore the research activities focused then preferentially on fibres, rovings and fabrics made of alkali-resistant (AR) glass, later on intensified on the material carbon, because this material is more alkali-resistant and thus more durable compared to AR-glass. Carbon-concretes require, compared to conventional reinforced concrete, only a small concrete cover of the reinforcement. For this reason very thin and slight components can be produced with this building material.
Beside the construction properties, the environmental compatibility of construction products becomes more and more important. Whereas at present it is assumed in Germany that standardised construction products or such which have a technical approval fulfil all requirements regarding the environmental compatibility, for new unknown products this has to be proved where necessary (ABuG, 2017) according to the “Principles for assessing the effects of construction products on soil and groundwater” of the Centre of Competence for Construction (DIBt).
Goal of the research project is to generate a broad, scientific verified data base via corresponding leaching and shower tests (laboratory and outdoor tests) on carbon-concrete test specimen with different concrete covering of the carbon-fibres as well as with different percentages of the carbon-fibres to evaluate the environmental compatibility of the new, innovative composite building material “carbon-concrete”. Based on this carbon-concretes can be classified if applicable I such a way, that further environmental testing is preferably not necessary (Without Further Testing (WFT)).
C³- Carbon Concrete Composite is funded by the Federal Ministry of Education and Research's "Twenty20 Partnership for Innovation" program (Project number 03ZZ0328A).