Carbon-reinforced concrete

Reinforcement structures with high temperature stability

An insufficient fire resistance of the composite material has so far inhibited a broad application of carbon-reinforced concrete. The reinforcement elements available at present are composite materials made of carbon fibers with a high number of filaments, which are embedded in a polymer matrix. The polymeric impregnation materials ensure the bond between the individual filaments and the concrete matrix. However, the inserted polymers soften under the effect of heat, and the carbon-reinforced concrete can no long resist the acting mechanical loads.

A promising approach is the development of less temperature-sensitive impregnation materials on the basis of mineral finest materials, however, this involves a lot of challenges. For one thing, the physical interaction of the hydrophobic carbon fibers with the water-based suspensions has to be increased and, for another thing, it is very difficult for the particle suspensions to penetrate the carbon multi-filament yarns.

In current studies, the development of such mineral-based impregnation materials is pushed forward, with their effectiveness being verified. In this process, it was already possible to demonstrate that the particle sizes of the reactive finest materials have a remarkable influence on the mechanical performance of the coated reinforcement elements, which consequently is also expressed in the bond behavior of the carbon-reinforced concrete. Additionally, it was demonstrated that a purposeful plasma treatment of the carbon fibers can considerably improve the interaction with the suspension of mineral finest materials.

In comparison with reference materials using polymer impregnation, the newly developed carbon reinforcements showed a significantly higher mechanical performance, in particular, in case of higher temperatures. The studies constitute an essential component for the successful implementation of carbon-reinforced concrete for wide use in construction practice, thus being of high strategic importance.

Related articles:

Issue 2019-02 Update on research 

Carbon-reinforced concrete - Ecological. Easy to use.

Carbon-reinforced concrete is a composite in which high-performance concrete is combined with carbon fibers. This material enables innovative, environmentally friendly and easy-to-apply construction...

Issue 2017-02 Test methods for carbon-reinforced concrete

Approaches to testing an innovative material ­under ­real-life conditions

On-site quality control for concrete is well established in reinforced concrete construction. Simple standard tests, which can be carried out by a lot of material testing institutes, allow for an...

Issue 2020-02 Digital construction

Novel carbon-fiber reinforcement for concrete 3D printing and other methods

Mineral-impregnated carbon-fiber composites (MCFs) constitute a new type of reinforcement for construction. While inheriting the advantages of existing carbon-fiber reinforcements, which are composite...

Issue 2016-02 Solidian

Facing the future with textile-reinforced concrete

Non-corrosive concrete reinforcement made of carbon and glass fibers provide for new design possibilities, increasing the efficiency in concrete construction. The Solidian company based in Albstadt,...

Issue 2020-02 Material research

Textile-reinforced concrete produced with renewable raw materials

Adding steel to the concrete matrix is a long-established method that is at the same time necessary because concrete exhibits a high level of compressive strength but only limited tensile strength,...