NCECC, Nano Carbon Enhanced Concrete Coating
|Coordinator||LANARK AKTIEBOLAG - Lanark AB|
|Funding from Vinnova||SEK 700 000|
|Project duration||December 2015 - April 2017|
Purpose and goal
The project aimed to improve the properties of commercially existing cement based coating material, with application of functionalized carbon nano-material (Graphene, carbon nono tube and carbon fiber). The idea was basically formulate an interacting "skin" of cement-based building stone powder for concrete walls and the following properties were aimed: good adhesion to the substrate, hydrophobic at the same time vapor permeable, sealed against penetration of carbon dioxide, some elasticity and with white basic color possible to pigment.
Expected results and effects
Screenings on different mix recipes with different concentration of nano-materials were performed. The results stated that a combination of graphene and carbon fiber functions best in order to obtain highest improvement in adhesion properties, water permeability and gas permeability and protection towards carbonation. A higher compressive strength and hardness levels in mixes containing graphene was detected.
Planned approach and implementation
The recipe screening was performed using a mini-cone test to account for rheological properties. Further, Pull-off test, water and gas Permeability, carbonation resistance tests as well compressive and flexural strength tests were performed. The changes in mineralogical and microstructural properties were performed using XRD and SEM analysis. Moreover, the resistance towards deformation was carried out by cupping tests, bend tests as well hardness measurements.