Journal article
Laboratory assessment of early-age durability benefits of a self-healing system to cementitious composites
Journal of Building Engineering, Vol.44, p.102602
12/2021
Handle:
https://hdl.handle.net/2376/121301
Abstract
Shrinkage of cement composites (paste, mortar, grout, or concrete) due to moisture loss during the curing period is a challenge for their durability. In this laboratory study, urea-formaldehyde (UF) microcapsules and polyvinyl alcohol (PVA) microfibres were utilized as a self-healing system to improve the early-age durability of cement mortars by mitigating their total shrinkage during the curing period. Experimental results revealed that the admixed UF microcapsules/PVA microfibres together could mitigate 25% of the total shrinkage during the curing period of 35 days. In addition, this self-healing system could reduce the gas permeability of the mortars by over 75%. The UF microcapsules and PVA microfibres could interfere with the formation of some crystalline hydration products and modify the microstructure of hydrated cement mortar, resulting in slight reductions in the compressive strength (less than 12%) and at some dosages significantly reduced the chloride migration coefficient of the mortars (i.e., 1% 1100+PVA, 2% 700, and 1% 1100). The UF microcapsules mainly affected the pores with a radius between 10 nm and 1000 nm, whereas the PVA microfibers mainly affected the larger pores at the interfacial transition zone.
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•Evaluated a self-healing system (UF microcapsules + PVA microfibers) in mortars.•This system could mitigate the total shrinkage of mortar by 25% (first 35 days).•This system could reduce the gas permeability of mortar by over 75%.•It also induced slight reductions in the compressive strength (less than 12%).•Some combinations reduced the chloride migration coefficient (up to 36%).
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Details
- Title
- Laboratory assessment of early-age durability benefits of a self-healing system to cementitious composites
- Creators
- Jialuo He - Advanced and Sustainable Infrastructure Materials Research Group, Department of Civil, Architectural and Environmental Engineering, Drexel University, Philadelphia, PA, 19104, USAXianming Shi - National Center for Transportation Infrastructure Durability & Life-Extension (TriDurLE), Department of Civil and Environmental Engineering, P.O. Box 642910, Washington State University, Pullman, WA, 99164-2910, USA
- Publication Details
- Journal of Building Engineering, Vol.44, p.102602
- Academic Unit
- Civil and Environmental Engineering, Department of
- Publisher
- Elsevier Ltd
- Identifiers
- 99900612060901842
- Language
- English
- Resource Type
- Journal article