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Detection and evaluation of autonomous crack repair by acoustic emission
The service life of concrete is dramatically reduced when cracks are not immediately detected and efficiently treated. In contrast to traditional manual repairing techniques (injection of healing agents into the crack), several innovative approaches aim at autonomous crack treatment during the concrete's service life. Mimicking the mechanisms from nature that enable injured organisms to recover, our research team manufactures concrete that regains its tightness, strength and stiffness after damage by embedding encapsulated healing agents into the material. In more detail, during concrete casting brittle glass capsules filled with two-component healing agent are placed at the areas where damage is expected. Crack formation breaks the capsules and the released agent fills the cracked plane. Local repair is achieved since the adhesion of the healing agent resets the material cracking resistance. The efficiency of such smart recovering technology is evaluated by performing small-scale bending tests on concrete beams and measuring the loading response in case of crack reopening after healing. Regain of mechanical properties is an initial sign of healing but does not provide sufficient information about the crack closure mechanism. A deep understanding of cracking damage and recovery is obtained by applying the Acoustic Emission (i.e. AE) technique. Resonant AE sensors, attached to concrete beams surface, capture the fracture activity and detect the initial crack opening and reopening after healing. It is concluded that AE hits activity correlate well with regain in strength and stiffness when reopening of healed cracks occurs. Finally, AE locates the area where healing successfully repairs damage.
Detection and evaluation of autonomous crack repair by acoustic emission
The service life of concrete is dramatically reduced when cracks are not immediately detected and efficiently treated. In contrast to traditional manual repairing techniques (injection of healing agents into the crack), several innovative approaches aim at autonomous crack treatment during the concrete's service life. Mimicking the mechanisms from nature that enable injured organisms to recover, our research team manufactures concrete that regains its tightness, strength and stiffness after damage by embedding encapsulated healing agents into the material. In more detail, during concrete casting brittle glass capsules filled with two-component healing agent are placed at the areas where damage is expected. Crack formation breaks the capsules and the released agent fills the cracked plane. Local repair is achieved since the adhesion of the healing agent resets the material cracking resistance. The efficiency of such smart recovering technology is evaluated by performing small-scale bending tests on concrete beams and measuring the loading response in case of crack reopening after healing. Regain of mechanical properties is an initial sign of healing but does not provide sufficient information about the crack closure mechanism. A deep understanding of cracking damage and recovery is obtained by applying the Acoustic Emission (i.e. AE) technique. Resonant AE sensors, attached to concrete beams surface, capture the fracture activity and detect the initial crack opening and reopening after healing. It is concluded that AE hits activity correlate well with regain in strength and stiffness when reopening of healed cracks occurs. Finally, AE locates the area where healing successfully repairs damage.
Detection and evaluation of autonomous crack repair by acoustic emission
Tsangouri, Eleni (author) / Aggelis, Dimitrios (author) / Tittelboom, Kim van (author) / Hemelrijck, Danny van (author)
2014
7 Seiten, Bilder, 10 Quellen
Conference paper
Storage medium
English
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