Journal article
Laboratory assessment of early-age durability benefits of a self-healing system to cementitious composites
JOURNAL OF BUILDING ENGINEERING, v 44, p102602
01 Dec 2021
Featured in Collection : UN Sustainable Development Goals @ Drexel
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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Details
- Title
- Laboratory assessment of early-age durability benefits of a self-healing system to cementitious composites
- Creators
- Jialuo He - Drexel UniversityXianming Shi - Washington State University
- Publication Details
- JOURNAL OF BUILDING ENGINEERING, v 44, p102602
- Publisher
- Elsevier
- Number of pages
- 15
- Grant note
- USDOT Center for Environmentally Sustainable Transportation in Cold Climates (CESTiCC) Simpson Strong-Tie Company through the WSU Excellence Fund
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Civil, Architectural, and Environmental Engineering
- Web of Science ID
- WOS:000700086800001
- Scopus ID
- 2-s2.0-85110515559
- Other Identifier
- 991019168547304721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Construction & Building Technology
- Engineering, Civil