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Resistance to chloride penetration of self-healing concrete with encapsulated polyuretyhane
Reinforcement corrosion induced by diffusion of chlorides is one of the most important damage mechanisms that leads to the deterioration of reinforced concrete structures. Cracking of reinforced concrete structures during their service life is almost inevitable. Cracks form preferential pathways for the ingress of chlorides and will accelerate the onset of corrosion and its propagation. In this paper, autonomous self-healing of cracks by encapsulated polyurethane is investigated as a possible method to heal cracks and reduce chloride ingress through cracks without human intervention. Cracks in concrete specimens were created in two ways: by means of thin metal plates to create standardized artificial cracks and by means of splitting tests to create realistic cracks. A crack width of 0.3 mm was chosen since most design codes limit the crack width to that value. The resistance to chloride penetration of autonomously healed concrete was evaluated by the diffusion test as described in NT Build 443. Uncracked, cracked and healed specimens were subjected to a 165 g/l NaCl solution for 7 weeks. After that period chloride profiles in the crack region and in an area further away from the crack were obtained by potentiometric titrations. From the resulting chloride profiles it was concluded that the polyurethane was very well able to seal both artificial and realistic cracks and reduce the chloride content in the crack zone significantly. At depths below the surface larger than 14 mm, healing was able to reduce the total chloride content in the crack zone by more than 70%.
Resistance to chloride penetration of self-healing concrete with encapsulated polyuretyhane
Reinforcement corrosion induced by diffusion of chlorides is one of the most important damage mechanisms that leads to the deterioration of reinforced concrete structures. Cracking of reinforced concrete structures during their service life is almost inevitable. Cracks form preferential pathways for the ingress of chlorides and will accelerate the onset of corrosion and its propagation. In this paper, autonomous self-healing of cracks by encapsulated polyurethane is investigated as a possible method to heal cracks and reduce chloride ingress through cracks without human intervention. Cracks in concrete specimens were created in two ways: by means of thin metal plates to create standardized artificial cracks and by means of splitting tests to create realistic cracks. A crack width of 0.3 mm was chosen since most design codes limit the crack width to that value. The resistance to chloride penetration of autonomously healed concrete was evaluated by the diffusion test as described in NT Build 443. Uncracked, cracked and healed specimens were subjected to a 165 g/l NaCl solution for 7 weeks. After that period chloride profiles in the crack region and in an area further away from the crack were obtained by potentiometric titrations. From the resulting chloride profiles it was concluded that the polyurethane was very well able to seal both artificial and realistic cracks and reduce the chloride content in the crack zone significantly. At depths below the surface larger than 14 mm, healing was able to reduce the total chloride content in the crack zone by more than 70%.
Resistance to chloride penetration of self-healing concrete with encapsulated polyuretyhane
Van Belleghem, Bjorn (author) / Van den Heede, Philip (author) / De Belie, Nele (author) / Ghafoori, N / Claisse, P / Ganjian, E / Naik, TR
2016-01-01
4th International Conference on Sustainable Construction Materials and Technologies (SCMT4) ; ISBN: 978-1535383943
Conference paper
Electronic Resource
English
DDC:
690
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