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The potential of bio-based repair system to increase the durability of repaired concrete structures



Author(s): V. Wiktor, H.M. Jonkers
Paper category: Conference
Book title: 2nd International conference on Microstructural-related Durability of Cementitious Composites
Editor(s): Guang Ye, K. Van Breugel, Wei Sun, Changwen Miao
Print ISBN: 978-2-35158-129-2
e-ISBN: 978-2-35158-123-0
Publisher: RILEM Publications SARL
Pages: 1315- 1323
Total Pages: 8
Language: English


Abstract: 
Periodic maintenance operations for concrete structures are generally focused on repairing concrete damages while not considering the relevant durability issues of the repair system itself. The main goal is to develop a bio-based repair system which features improved durability and sustainability characteristics compared to currently commercially available systems. The authors investigated (i) the effect of the pH of two transportation solutions on the bacterial activity, the biological part of the repair system, and (ii) the influence of the nutrient source, i.e. the mineral precursor compound of the repair system, on the cement paste microstructure, with or without bacterial activity. Two distinct surface layers have been observed depending of the treatment performed. The first type is a thick Ca-based layer formed with the treatment with glucose with or without bacteria. The second type has been observed for the treatment with glucose+NaS (sodium silicate) with or without bacteria. In the latter case a silica-based layer was noticed at 7 days and at 28 days some few locations only exhibit a glucose/NaS surface layer. The results have shown that treatment of mortar specimen with glucose repair solution with or without bacteria promoted vaterite formation instead of calcite. This was probably due to the neutral pH of the solution and the possible adsorption of glucose on CaCO₃ nuclei.


Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00