The effect on crack repair by bacteria-based healing under active water flow

Naho Takeda, H.M. Jonkers, Renee Mors

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

Abstract

In case of water retaining structures healing should occur under active flow conditions, with various water pressures and speeds of leakage. The present study was undertaken in order to evaluate the effect on crack repair of mortar by bacteria-based healing under active water flow. The mortar with the bacteria-based lactate-derived healing agent (HA) was added by 2% of cement mass. The results of the crack healing effect which was evaluated based on water permeability test were compared with normal mortar. The permeability test was carried out with various heights of water head. Disks with above 0.5mm crack in the middle was used as specimens. Consequently, the water flow rate increased as the water head became large, however it started to decrease as time goes by. It is probable that cracks will be repaired by bacteria-based healing under active water flow because the water tightness of with HA mortar reached 99%. On the other hand the tightness of normal mortar did not reach more than 97%. It was observed that the crack surface was healed by some material. from microscopic observation. The results of this study shows that the HA can be applied to crack repair system under active water flow.
Original languageEnglish
Title of host publication4th International Conference on Service Life Design for Infrastructures
Subtitle of host publication(SLD4) 27-30 August 2018 – Delft, Netherlands
EditorsGuang Ye, Yong Yuan, Claudia Romero Rodriguez, Hongzhi Zhang, Branko Šavija
PublisherRilem
Pages422-428
ISBN (Electronic)978-2-35158-213-8
Publication statusPublished - 2018
Event4th International Conference on Service
Life Design for Infrastructures
- Delft, Netherlands
Duration: 27 Aug 201830 Aug 2018
Conference number: 4

Publication series

NameRilem proceedings
PublisherRilem
NumberPRO 125

Conference

Conference4th International Conference on Service
Life Design for Infrastructures
Abbreviated titleSLD4
CountryNetherlands
CityDelft
Period27/08/1830/08/18

Keywords

  • Efflorescence
  • cement-based exterior wall
  • mitigation
  • metakaolin

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  • Cite this

    Takeda, N., Jonkers, H. M., & Mors, R. (2018). The effect on crack repair by bacteria-based healing under active water flow. In G. Ye, Y. Yuan, C. R. Rodriguez, H. Zhang, & B. Šavija (Eds.), 4th International Conference on Service Life Design for Infrastructures: (SLD4) 27-30 August 2018 – Delft, Netherlands (pp. 422-428). (Rilem proceedings; No. PRO 125). Rilem.