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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
A New Class of Hybrid Self-healing Cementitious Materials Combining Shape Memory Alloy Wires and Super Absorbent Polymers
https://orcid.org/http://orcid.org/0000-0002-6365-9887
It is anticipated that deterioration of concrete infrastructure around the world will be exacerbated as changes in our climate becomes increasingly uncertain. As a result, enormous economic investments are being made each year to repair concrete structures to both maintain and extend their service lives. Thus, the development of more intrinsically resilient concrete materials is needed more than ever. This research focuses on developing a new hybrid self-healing cementitious material which leverages the characteristics of shape memory alloy (SMA) wires and super absorbent polymers (SAPs). SAPs have the ability to absorb very large amounts of water. When added during batching of cementitious materials, SAPs can absorb water from the surrounding environment which enhances the material’s ability to autogenously seal cracks and recover a portion of its original mechanical properties. However, this autogenous healing mechanism has been shown to only be effective for sealing relatively small cracks. This experimental study proposes using SAPs in combination with SMA wires which, when heated, can recover their original shape, and simultaneously reduce cracks to widths which can be sealed through enhanced autonomous self-healing. To evaluate this new hybrid mechanism, the concept of ‘self-healing efficiency’ is defined and investigated through microscopic measurement of crack widths, and the experimental measurement of fracture energy recovery. The results revealed that for specimens containing SAPs and subjected to cyclic curing, 41% of crack widths were completely sealed after 28 days, and 1.54 fracture energy recovery was achieved. The results of this study are promising and have demonstrated the efficacy of this new hybrid healing mechanism and its potential to create longer lasting and more resilient concrete infrastructure.
A New Class of Hybrid Self-healing Cementitious Materials Combining Shape Memory Alloy Wires and Super Absorbent Polymers
https://orcid.org/http://orcid.org/0000-0002-6365-9887
It is anticipated that deterioration of concrete infrastructure around the world will be exacerbated as changes in our climate becomes increasingly uncertain. As a result, enormous economic investments are being made each year to repair concrete structures to both maintain and extend their service lives. Thus, the development of more intrinsically resilient concrete materials is needed more than ever. This research focuses on developing a new hybrid self-healing cementitious material which leverages the characteristics of shape memory alloy (SMA) wires and super absorbent polymers (SAPs). SAPs have the ability to absorb very large amounts of water. When added during batching of cementitious materials, SAPs can absorb water from the surrounding environment which enhances the material’s ability to autogenously seal cracks and recover a portion of its original mechanical properties. However, this autogenous healing mechanism has been shown to only be effective for sealing relatively small cracks. This experimental study proposes using SAPs in combination with SMA wires which, when heated, can recover their original shape, and simultaneously reduce cracks to widths which can be sealed through enhanced autonomous self-healing. To evaluate this new hybrid mechanism, the concept of ‘self-healing efficiency’ is defined and investigated through microscopic measurement of crack widths, and the experimental measurement of fracture energy recovery. The results revealed that for specimens containing SAPs and subjected to cyclic curing, 41% of crack widths were completely sealed after 28 days, and 1.54 fracture energy recovery was achieved. The results of this study are promising and have demonstrated the efficacy of this new hybrid healing mechanism and its potential to create longer lasting and more resilient concrete infrastructure.
A New Class of Hybrid Self-healing Cementitious Materials Combining Shape Memory Alloy Wires and Super Absorbent Polymers
https://orcid.org/http://orcid.org/0000-0002-6365-9887
It is anticipated that deterioration of concrete infrastructure around the world will be exacerbated as changes in our climate becomes increasingly uncertain. As a result, enormous economic investments are being made each year to repair concrete structures to both maintain and extend their service lives. Thus, the development of more intrinsically resilient concrete materials is needed more than ever. This research focuses on developing a new hybrid self-healing cementitious material which leverages the characteristics of shape memory alloy (SMA) wires and super absorbent polymers (SAPs). SAPs have the ability to absorb very large amounts of water. When added during batching of cementitious materials, SAPs can absorb water from the surrounding environment which enhances the material’s ability to autogenously seal cracks and recover a portion of its original mechanical properties. However, this autogenous healing mechanism has been shown to only be effective for sealing relatively small cracks. This experimental study proposes using SAPs in combination with SMA wires which, when heated, can recover their original shape, and simultaneously reduce cracks to widths which can be sealed through enhanced autonomous self-healing. To evaluate this new hybrid mechanism, the concept of ‘self-healing efficiency’ is defined and investigated through microscopic measurement of crack widths, and the experimental measurement of fracture energy recovery. The results revealed that for specimens containing SAPs and subjected to cyclic curing, 41% of crack widths were completely sealed after 28 days, and 1.54 fracture energy recovery was achieved. The results of this study are promising and have demonstrated the efficacy of this new hybrid healing mechanism and its potential to create longer lasting and more resilient concrete infrastructure.
A New Class of Hybrid Self-healing Cementitious Materials Combining Shape Memory Alloy Wires and Super Absorbent Polymers
RILEM Bookseries
Jędrzejewska, Agnieszka (Herausgeber:in) / Kanavaris, Fragkoulis (Herausgeber:in) / Azenha, Miguel (Herausgeber:in) / Benboudjema, Farid (Herausgeber:in) / Schlicke, Dirk (Herausgeber:in) / Antoun, Mario (Autor:in) / Butler, Liam J. (Autor:in)
International RILEM Conference on Synergising expertise towards sustainability and robustness of CBMs and concrete structures ; 2023 ; Milos Island, Greece
09.06.2023
11 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
| British Library Online Contents | 2018
Analytical Modeling of Self-Healing and Super Healing in Cementitious Materials
| UB Braunschweig | 2020
Analytical Modeling of Self-Healing and Super Healing in Cementitious Materials
| TIBKAT | 2020
Sustainability and Economic Viability of Self-healing Concrete Containing Super Absorbent Polymers
| Springer Verlag | 2023