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Restoration of Deteriorated Concrete Columns byWrapping with an Ecological UHPC
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser. (Building Materials)
2019 (Engelska)Ingår i: Restoration of Deteriorated Concrete Columns byWrapping with an Ecological UHPC, MDPI, 2019Konferensbidrag, Muntlig presentation med publicerat abstract (Övrigt vetenskapligt)
Abstract [en]

Ultra high performance concrete (UHPC) is self-compacting, reaching compressive strengthover 200 MPa and flexural strength exceeding 30 MPa material. The used very low W/C ratio andhigh amount of Portland cement often exceeding 900 kg/m3, addition of up to 30% of silica fumeproduces a very dense and nearly impermeable binder matrix. In this research, cement wassubstituted with limestone filler to lower the effective CO2 footprint. Prepared concrete mixes hadhigh slump flow of 850 mm and reached the compressive strength of 150 MPa after 28 days. Fullscalecolumns 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 monthsold columns were water jetted to simulated real case scenario (Figure 1c). For the test, the columnswere surrounded by a plywood formwork leaving less than 3 cm of spacing between the concretesurface and the formwork (Figure 1d). The concrete was poured from top of the column and with nosegregation reached the bottom and perfectly filled the mold. Test included determination of basicmechanical properties, bond strength between UHPC and “old” concrete, crack formation and frostdurability. All results exceeded expectations.

Ort, förlag, år, upplaga, sidor
MDPI, 2019.
Nyckelord [en]
UHPC; silica fume; limestone; workability; strength; frost durability; normal concrete; ecological
Nationell ämneskategori
Teknik och teknologier
Forskningsämne
Byggmaterial
Identifikatorer
URN: urn:nbn:se:ltu:diva-77345DOI: 10.3390/proceedings2019034004OAI: oai:DiVA.org:ltu-77345DiVA, id: diva2:1384703
Konferens
1st International Conference on Smart Materials for Sustainable Construction—SMASCO 2019, Luleå, Sweden
Tillgänglig från: 2020-01-10 Skapad: 2020-01-10 Senast uppdaterad: 2020-01-10

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Kothari, Ankit

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