Design and testing of tubular polymeric capsules for self-healing of concrete

3rd International Conference on Innovative Materials, Structures and Technologies

Araújo, M.^1,2 ; Van Tittelboom, K.^1 ; Feiteira, J.^1 ; Gruyaert, E.^1 ; Chatrabhuti, S.^3 ; Raquez, J.-M.^3 ; Šavija, B.^4 ; Alderete, N.^1,5 ; Schlangen, E.^4 ; De Belie, N.^1

Magnel Laboratory for Concrete Research, Department of Structural Engineering, Faculty of Engineering and Architecture, Technologiepark Zwijnaarde 904, Ghent

9052, Belgium^1

Polymer Chemistry and Biomaterials Group, Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281, Building S4-bis, Ghent

9000, Belgium^2

Laboratory of Polymeric and Composite Materials, Center of Innovation and Research in Materials and Polymers, University of Mons, Place du Parc 23, Mons

B-7000, Belgium^3

Microlab, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, Delft

2628CN, Netherlands^4

LEMIT, CONICET, 52 entre 121 y 122 s/n, La Plata

1900, Argentina^5

关键词: Crack creation;    Demineralized water;    Poly(methyl methacrylate) (PMMA);    Polylactic acids;    Polymeric capsules;    Reference beams;    Self-healing concretes;    Simulated concrete pore solution;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/251/1/012003/pdf
DOI  :  10.1088/1757-899X/251/1/012003

来源: IOP

【 摘 要 】

Polymeric healing agents have proven their efficiency to heal cracks in concrete in an autonomous way. However, the bottleneck for valorisation of self-healing concrete with polymeric healing agents is their encapsulation. In the present work, the suitability of polymeric materials such as poly(methyl methacrylate) (PMMA), polystyrene (PS) and poly(lactic acid) (PLA) as carriers for healing agents in self-healing concrete has been evaluated. The durability of the polymeric capsules in different environments (demineralized water, salt water and simulated concrete pore solution) and their compatibility with various healing agents have been assessed. Next, a numerical model was used to simulate capsule rupture when intersected by a crack in concrete and validated experimentally. Finally, two real-scale self-healing concrete beams were made, containing the selected polymeric capsules (with the best properties regarding resistance to concrete mixing and breakage upon crack formation) or glass capsules and a reference beam without capsules. The self-healing efficiency was determined after crack creation by 3-point-bending tests.