SCREENING OF PH-RESPONSIVE HYDROGELS FOR ENCAPSULATION OF BACTERIA FOR CONCRETE CRACK SELF-SEALING

Author(s): J. Wang, A. Mignon, G. Trenson, S. Van Vlierberghe, N. Boon and N. De Belie
Paper category: Proceedings
Book title: Proceedings of the Final Conference of RILEM 253-MCI Microorganisms-Cementitious Materials Interactions Volume II
Editor(s): Alexandra Bertron and Henk Jonkers
ISBN: 978-2-35158-207-7 (Set)
ISBN: 978-2-35158-210-7 (Volume 2)
e-ISBN: 978-2-35158-206-0
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 405-412
Total Pages: 308
Language : English

Abstract: Alginate based and chitosan based hydrogels were investigated in this study for encapsulation of bacteria for self-healing cracks. Both of them had a good pH-responsiveness: low swelling in the alkaline cement filtrate (about 12g water/g hydrogel) and a higher swelling capacity of 40 g water/g hydrogel under slightly alkaline condition of 8~11. Due to this, the hydrogels had limited negative effect on the strength, only 5% strength loss was observed in the specimens with 1m% chitosan based hydrogel added. Furthermore, the chitosan based hydrogel had an excellent compatibility with the bacterial spores, which can completely revive the activity within 3 days. Enhanced sealing efficiency was seen in the specimens with the encapsulated spores, which was due to the bacterial calcium carbonate precipitation. The specimens with chi-HS had an evident higher sealing efficiency (88%-90%) than those with chi-H (80%), at the same initial water flow range.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00