Development of a liquid bio-based repair system for aged concrete structures

Author(s): V. Wiktor, A. Thijssen, H.M. Jonkers
Paper category: Conference
Book title: Concrete Repair, Rehabilitation and Retrofitting III (ICCRRR)
Editor(s): M.G. Alexander, H.-D. Beushausen, F. Dehn, P. Moyo
Print ISBN: 978-0-415-89952-9
Publisher: Taylor & Francis Group
Pages: 345- 346
Total Pages: 2
Language: English

Abstract: 
The present study focuses on the development of a bio-based repair system. In this paper, the authors investigated (i) the effect of the pH of two transportation solutions on the bacterial activity, the biological part of the repair which mediates mineral formation and (ii) the influence of the nutrient source on the cement paste microstructure, with or without bacterial activity. The results emphasized that the pH of the transportation solution should be alkaline to prevent a rapid leaching of calcium and hydroxide ions from the cement paste. Furthermore, an alkaline pH also promotes bacteria activity resulting in Ca-based mineral formation. The bio based repair system composed of bacteria, and Na-gluconate in water glass appears to be the most promising as it results in bacterial activity, densification of the microstructure of the cement paste and limited leaching of calcium.

Online publication: 2014
Publication Type: abstract_only
Public price (Euros): 0.00