Microencapsulated spores and growth media for self-healing mortars

Kevin Paine, Ilaria Horne, Linzhen Tan, Trupti Sharma, Andrew Heath, Richard Cooper, Jon Virgoe, David Palmer, Alex Kerr

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The paper reports on a study to use synthesised gelatin/acacia gum microcapsules as a carrier for spores and growth media for self-healing mortar. The microcapsules were created using complex coacervation. It was found that encapsulation of spores of Bacillus pseudofirmus was relatively straightforward. However, because elements of the growth media were water-soluble it was necessary to use an emulsion stabiliser to create suitable microcapsules. The microcapsules were added to cement mortars and pastes to investigate their effect on early-age properties and their self-healing capability. Isothermal conduction calorimetry showed that the microcapsules had few effects on the hydration of cement and that they survived the mixing process as designed. Tests were carried out to determine the self-healing capability by means of capillary absorption. Cal-cite precipitation and crack closure was observed in the mortar that contained both encapsulated spores and growth media.
Original languageEnglish
Title of host publicationLife-Cycle Analysis and Assessment in Civil Engineering
Subtitle of host publicationTowards an Integrated Vision
EditorsRobby Caspeele, Luc Taerwe, Dan M. Frangopol
Place of PublicationLondon, U. K.
PublisherCRC Press
Pages2247-2254
ISBN (Electronic)9781315228914
ISBN (Print)9781138626331
Publication statusPublished - 10 Oct 2018
EventSixth International Symposium on Life-Cycle Civil Engineering - Ghent, Belgium
Duration: 28 Oct 201831 Oct 2018

Conference

ConferenceSixth International Symposium on Life-Cycle Civil Engineering
Abbreviated titleIALCCE 2018
CountryBelgium
CityGhent
Period28/10/1831/10/18

Cite this

Paine, K., Horne, I., Tan, L., Sharma, T., Heath, A., Cooper, R., ... Kerr, A. (2018). Microencapsulated spores and growth media for self-healing mortars. In R. Caspeele, L. Taerwe, & D. M. Frangopol (Eds.), Life-Cycle Analysis and Assessment in Civil Engineering: Towards an Integrated Vision (pp. 2247-2254). London, U. K.: CRC Press.

Microencapsulated spores and growth media for self-healing mortars. / Paine, Kevin; Horne, Ilaria; Tan, Linzhen; Sharma, Trupti; Heath, Andrew; Cooper, Richard; Virgoe, Jon; Palmer, David; Kerr, Alex.

Life-Cycle Analysis and Assessment in Civil Engineering: Towards an Integrated Vision. ed. / Robby Caspeele; Luc Taerwe; Dan M. Frangopol. London, U. K. : CRC Press, 2018. p. 2247-2254.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Paine, K, Horne, I, Tan, L, Sharma, T, Heath, A, Cooper, R, Virgoe, J, Palmer, D & Kerr, A 2018, Microencapsulated spores and growth media for self-healing mortars. in R Caspeele, L Taerwe & DM Frangopol (eds), Life-Cycle Analysis and Assessment in Civil Engineering: Towards an Integrated Vision. CRC Press, London, U. K., pp. 2247-2254, Sixth International Symposium on Life-Cycle Civil Engineering, Ghent, Belgium, 28/10/18.
Paine K, Horne I, Tan L, Sharma T, Heath A, Cooper R et al. Microencapsulated spores and growth media for self-healing mortars. In Caspeele R, Taerwe L, Frangopol DM, editors, Life-Cycle Analysis and Assessment in Civil Engineering: Towards an Integrated Vision. London, U. K.: CRC Press. 2018. p. 2247-2254
Paine, Kevin ; Horne, Ilaria ; Tan, Linzhen ; Sharma, Trupti ; Heath, Andrew ; Cooper, Richard ; Virgoe, Jon ; Palmer, David ; Kerr, Alex. / Microencapsulated spores and growth media for self-healing mortars. Life-Cycle Analysis and Assessment in Civil Engineering: Towards an Integrated Vision. editor / Robby Caspeele ; Luc Taerwe ; Dan M. Frangopol. London, U. K. : CRC Press, 2018. pp. 2247-2254
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AB - The paper reports on a study to use synthesised gelatin/acacia gum microcapsules as a carrier for spores and growth media for self-healing mortar. The microcapsules were created using complex coacervation. It was found that encapsulation of spores of Bacillus pseudofirmus was relatively straightforward. However, because elements of the growth media were water-soluble it was necessary to use an emulsion stabiliser to create suitable microcapsules. The microcapsules were added to cement mortars and pastes to investigate their effect on early-age properties and their self-healing capability. Isothermal conduction calorimetry showed that the microcapsules had few effects on the hydration of cement and that they survived the mixing process as designed. Tests were carried out to determine the self-healing capability by means of capillary absorption. Cal-cite precipitation and crack closure was observed in the mortar that contained both encapsulated spores and growth media.

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