A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Use of methacrylated alginate for self-healing concrete
Superabsorbent polymers (SAPs) are cross-linked networks able to take up aqueous sdoialupteiorsn,s f ourp b tioo mseedveicraall phuurnpdorseeds taimnde sa gthrieciur lotuwranl wuseeig. hRt.e Tcehnetyly a, rteh euys headv neo fwouandda yths einir way in concrete-related applications. The presence of cracks endangers the durability of concrete. A possibility to stimulate self-healing of cracks is the addition of such a SAP. Upon crack formation, these SAP particles will absorb incoming water and swell, thereby closing the fracture and preventing further infiltration. When the SAP then slowly releases the absorbed water to the surrounding cement particles, it will aid the autogenous healing. One of the major issues is the negative impact these SAPs have on the compressive strength of mortar. The present work reports on the development and the characterization of SAPs based on a polysaccharide (i.e. methacrylated alginate, algMOD) combined with acrylic monomers acrylamide (AM) and/or acrylic acid (AA), with a variation of the degree of methacrylation of the algMOD applied. This is useful to study the effect of the density of the cross-linked network when incorporated in mortar. The resulting materials were characterized in depth using ATR-FTIR spectroscopy, high resolution magic angle spinning (HR-MAS) 1H-NMR spectroscopy, dynamic vapour sorption (DVS) experiments (to assess moisture uptake capacity) and optical microscopy. The influence on the mortar mixtures was examined by flexural and compressive tests. Finally, the effect on the self-sealing and -healing efficiency was tested. The SAPs showed a swelling capacity up to 600 times their own weight. Especially algMOD–AA does not significantly reduce the compressive strength (even upon addition of 1 wt% of this SAP versus cement weight). AlgMOD–AA also shows a very promising self-sealing and -healing behaviour and can be considered a very interesting and relatively cheap solution to seal and heal cracks in concrete.
Use of methacrylated alginate for self-healing concrete
Superabsorbent polymers (SAPs) are cross-linked networks able to take up aqueous sdoialupteiorsn,s f ourp b tioo mseedveicraall phuurnpdorseeds taimnde sa gthrieciur lotuwranl wuseeig. hRt.e Tcehnetyly a, rteh euys headv neo fwouandda yths einir way in concrete-related applications. The presence of cracks endangers the durability of concrete. A possibility to stimulate self-healing of cracks is the addition of such a SAP. Upon crack formation, these SAP particles will absorb incoming water and swell, thereby closing the fracture and preventing further infiltration. When the SAP then slowly releases the absorbed water to the surrounding cement particles, it will aid the autogenous healing. One of the major issues is the negative impact these SAPs have on the compressive strength of mortar. The present work reports on the development and the characterization of SAPs based on a polysaccharide (i.e. methacrylated alginate, algMOD) combined with acrylic monomers acrylamide (AM) and/or acrylic acid (AA), with a variation of the degree of methacrylation of the algMOD applied. This is useful to study the effect of the density of the cross-linked network when incorporated in mortar. The resulting materials were characterized in depth using ATR-FTIR spectroscopy, high resolution magic angle spinning (HR-MAS) 1H-NMR spectroscopy, dynamic vapour sorption (DVS) experiments (to assess moisture uptake capacity) and optical microscopy. The influence on the mortar mixtures was examined by flexural and compressive tests. Finally, the effect on the self-sealing and -healing efficiency was tested. The SAPs showed a swelling capacity up to 600 times their own weight. Especially algMOD–AA does not significantly reduce the compressive strength (even upon addition of 1 wt% of this SAP versus cement weight). AlgMOD–AA also shows a very promising self-sealing and -healing behaviour and can be considered a very interesting and relatively cheap solution to seal and heal cracks in concrete.
Use of methacrylated alginate for self-healing concrete
Mignon, Arn (author) / Vermeulen, Jolierver (author) / Snoeck, Didier (author) / Dubruel, Peter (author) / Van Vlierberghe, Sandra (author) / De Belie, Nele (author)
2016-01-01
HEALCON-Conference - Self-healing concrete for prolonged lifetime
Conference paper
Electronic Resource
English
DDC:
690
Alginate encapsulation technology of bacteria for promising self-healing concrete
| DOAJ | 2024
Sodium Alginate Application in Self-healing Technology for Asphalt Concrete
| Springer Verlag | 2021
| British Library Online Contents | 2015
| British Library Online Contents | 2015