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.
|Title of host publication||Life-Cycle Analysis and Assessment in Civil Engineering|
|Subtitle of host publication||Towards an Integrated Vision|
|Editors||Robby Caspeele, Luc Taerwe, Dan M. Frangopol|
|Place of Publication||London, U. K.|
|Publication status||Published - 10 Oct 2018|
|Event||Sixth International Symposium on Life-Cycle Civil Engineering - Ghent, Belgium|
Duration: 28 Oct 2018 → 31 Oct 2018
|Conference||Sixth International Symposium on Life-Cycle Civil Engineering|
|Abbreviated title||IALCCE 2018|
|Period||28/10/18 → 31/10/18|
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.