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Restoration of Deteriorated Concrete Columns by Wrapping with an Ecological UHPC
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.ORCID iD: 0000-0001-5136-9412
RISE Research Institutes of Sweden, 11121 Stockholm, Sweden.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.ORCID iD: 0000-0001-6287-2240
2019 (English)In: Proceedings, 2019, SMASCO 2019: The 1st International Conference on Smart Materials for Sustainable Construction / [ed] Andrzej Cwirzen, Karin Habermehl-Cwirzen, Carina Hannu, Magdalena Rajczakowska, Ilda Tole, Thanyarat Buasiri, Ankit Kothari, Vasiola Zhaka, MDPI, 2019, article id 4Conference paper, Oral presentation with published abstract (Other academic)
Abstract [en]

Ultra high performance concrete (UHPC) is self-compacting, reaching compressive strength over 200 MPa and flexural strength exceeding 30 MPa material. The used very low W/C ratio and high amount of Portland cement often exceeding 900 kg/m3, addition of up to 30% of silica fume produces a very dense and nearly impermeable binder matrix. In this research, cement was substituted with limestone filler to lower the effective CO2 footprint. Prepared concrete mixes had high slump flow of 850 mm and reached the compressive strength of 150 MPa after 28 days. Full-scale columns having dimension of 30 × 30 × 250 cm were produced using self-compacting concrete (Figure 1a,b), having the 28 days compressive strength of 40 MPa. External surfaces of the 3 months old columns were water jetted to simulated real case scenario (Figure 1c). For the test, the columns were surrounded by a plywood formwork leaving less than 3 cm of spacing between the concrete surface and the formwork (Figure 1d). The concrete was poured from top of the column and with no segregation reached the bottom and perfectly filled the mold. Test included determination of basic mechanical properties, bond strength between UHPC and “old” concrete, crack formation and frost durability. All results exceeded expectations.

Place, publisher, year, edition, pages
MDPI, 2019. article id 4
Series
Proceedings, ISSN 2504-3900, E-ISSN 2504-3900 ; 34(1)
Keywords [en]
UHPC, silica fume, limestone, workability, strength, frost durability, normal concrete, ecological
National Category
Other Materials Engineering
Research subject
Building Materials
Identifiers
URN: urn:nbn:se:ltu:diva-77345DOI: 10.3390/proceedings2019034004OAI: oai:DiVA.org:ltu-77345DiVA, id: diva2:1384703
Conference
The 1st International Conference on Smart Materials for Sustainable Construction (SMASCO 2019), 10-12 December, 2019, Luleå, Sweden
Available from: 2020-01-10 Created: 2020-01-10 Last updated: 2020-09-15Bibliographically approved

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Kothari, AnkitCwirzen, Andrzej

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