Crack formation behavior of carbon-reinforced concrete for state II sealing layers

Conference: The International Federation for Structural Concrete 20th FIB International Symposium, Antibes, France, 16–18 June 2025

The research project DifaCarb (Development of State II Sealing Layers for German Water Resource Law [WHG] Surfaces Made of Fiber-Reinforced Carbon Concrete) aims to reduce sealing layer thickness from 200 mm to only 35 mm by using carbon reinforcements. This is particularly beneficial in confined spaces with limited height. The goal is a State II sealing layer with fine crack widths under strains up to 2‰, enabling rehabilitation of cracked substrates. Experiments showed that epoxy-sand-coated, multilayer carbon reinforcements produce uniform crack patterns with narrow widths. Overlap lengths of five mesh sizes were sufficient to ensure a sufficient load-bearing behaviour.

Image © Fabian Kufner.
Image © Fabian Kufner.

More information
https://www.researchgate.net/publication/393870148_Crack_Formation_Behavior_of_Carbon-Reinforced_Concrete_for_State_II_Sealing_Layers