A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Bio-based pH-responsive superabsorbent polymers for self-healing cracks in concrete
Cracks endanger the durability of concrete. Introducing a superabsorbent polymer (SAP) during concrete mixing can create a self-sealing and -healing construction. SAPs are able to take up aqueous solutions up to several hundred times their own weight. Bio-based SAPs starting from polysaccharides have gained increasing interest in recent years due to their biocompatibility, non-toxicity and low price. The use of pH-responsive SAPs can also be extremely useful as they should only swell more upon crack formation and less during mixing of the SAPs in the concrete. The present work describes the development and the characterization of SAPs based on methacrylated polysaccharides (alginate and chitosan) combined with pH-responsive monomers dimethylaminoethyl methacrylate (DMAEMA) and dimethylaminopropyl methacrylamide (DMAPMA). The materials exhibited a high moisture uptake capacity up to 120% of their original weight with a negligible hysteresis. The pHresponsive swelling behavior was studied in aqueous and cement filtrate solutions with a varying pH. Chitosan combined with DMAEMA or DMAPMA showed the targeted pHresponsive swelling. Chitosan combined with DMAPMA also showed a limited compression strength reduction and a promising self-sealing and -healing behavior and could thus be considered as a very interesting future solution to seal and heal cracks in concrete.
Bio-based pH-responsive superabsorbent polymers for self-healing cracks in concrete
Cracks endanger the durability of concrete. Introducing a superabsorbent polymer (SAP) during concrete mixing can create a self-sealing and -healing construction. SAPs are able to take up aqueous solutions up to several hundred times their own weight. Bio-based SAPs starting from polysaccharides have gained increasing interest in recent years due to their biocompatibility, non-toxicity and low price. The use of pH-responsive SAPs can also be extremely useful as they should only swell more upon crack formation and less during mixing of the SAPs in the concrete. The present work describes the development and the characterization of SAPs based on methacrylated polysaccharides (alginate and chitosan) combined with pH-responsive monomers dimethylaminoethyl methacrylate (DMAEMA) and dimethylaminopropyl methacrylamide (DMAPMA). The materials exhibited a high moisture uptake capacity up to 120% of their original weight with a negligible hysteresis. The pHresponsive swelling behavior was studied in aqueous and cement filtrate solutions with a varying pH. Chitosan combined with DMAEMA or DMAPMA showed the targeted pHresponsive swelling. Chitosan combined with DMAPMA also showed a limited compression strength reduction and a promising self-sealing and -healing behavior and could thus be considered as a very interesting future solution to seal and heal cracks in concrete.
Bio-based pH-responsive superabsorbent polymers for self-healing cracks in concrete
Mignon, Arn (author) / Devisscher, Dries (author) / Vermeulen, J (author) / Snoeck, Didier (author) / Dubruel, Peter (author) / Van Vlierberghe, Sandra (author) / De Belie, Nele (author) / Azenha, M / Gabrijel, I / Schlicke, D
2016-01-01
Service Life of Cement-Based Materials and Structures ; ISBN: 978-2-35158-170-4 ; ISBN: 978-2-35158-173-5
Conference paper
Electronic Resource
English
DDC:
690
Self-sealing of cracks in concrete using superabsorbent polymers
| British Library Online Contents | 2016
Self-sealing of cracks in concrete using superabsorbent polymers
| British Library Online Contents | 2016
Self-sealing of cracks in concrete using superabsorbent polymers
| Elsevier | 2015