Kriechen von Ultrahochfestem Beton (UHFB)

Tue, Nguyen Viet; Ma, Jin; Orgass, Marko

doi:10.1002/bate.200610012

Cited by 7 publications

(3 citation statements)

References 3 publications

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“…Changing concrete microstructure, it affects the basic properties of concrete, impacting both the concrete's physical parameters (e.g., density, absorptivity) and mechanical characteristics (e.g., compressive strength). It is often used as an reactive pozzolan, in high performance concretes [13][14][15] and in lightweight concretes [16][17][18].…”

Section: Highly Reactive Pozzolansmentioning

confidence: 99%

The Effect of Aggregate Shape on the Properties of Concretes with Silica Fume

Strzałkowski

Garbalińska

2020

Materials

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The paper examines the impact of aggregate shape on the compressive strength and thermal properties of concretes with silica fume based on two different aggregates: natural round gravel aggregate and crushed basalt aggregate. Compressive strength and thermal properties of individual concretes were determined during the first year of specimens curing. Additionally, porosity tests were conducted using mercury intrusion porosimetry and optical porosimetry. Mercury porosimetry tests showed that the use of silica fume led to a decrease in the content of pores of size smaller than 0.15 µm compared to the reference concretes without the addition of silica fume. However, tests carried out on crushed basalt-based concrete showed the presence of numerous additional pores with diameters ranging from 0.05 to 300 μm. In case of natural round gravel aggregate-based concrete, the addition of silica fume brought about an increase in its compressive strength. In turn, basalt-based concrete exhibited notably lower compressive strength values due to significantly higher porosity within the range of more than 70 μm. In basalt concrete, the obtained λ values are much lower than in concretes with normal gravel aggregate. In addition, the specific porosity structure had its impact on the process of drying of specimens of each group which occurred at a significantly faster rate in the basalt-based concrete. In conclusion, it can be stated that the use of crushed basalt aggregate causes a significant aeration of concrete, even despite the use of silica fume. As a result, the concrete based on crushed aggregate is characterized by a definitely lower compressive strength, but also better thermal insulation properties compared to analogous concrete made on natural round gravel aggregate.

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Section: Highly Reactive Pozzolansmentioning

confidence: 99%

The Effect of Aggregate Shape on the Properties of Concretes with Silica Fume

Strzałkowski

Garbalińska

2020

Materials

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“…The w/c ratio of 0.49 also refers to the dry mix [82]: the effective w/c ratio is likely closer to 0.45 once assumed absorptions of sand and gravel of 1% and 0.5% are accounted for. Lastly, the w/c ratio of the Ultra High Performance Concrete investigated in [83] is likely lower than 0.5: the article reports that the volume fraction of cement paste is 50%, but the w/c ratio and proportions of the mix are not thoroughly described. Corresponding tests are therefore discarded from the comparison.…”

Section: Basic Creep Tests From the Nu Database 231 Modifications Sug...mentioning

confidence: 99%

Confronting a refined multiscale estimate for the aging basic creep of concrete with a comprehensive experimental database

Lavergne

Barthélémy

2020

Cement and Concrete Research

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“…Die angesetzte Größe dieser K-Koeffizienten wurde nach Auftragserteilung anhand von vorab [18]. Untersuchungen von [21] zum Kriechverhalten von UHFB sowie die Regelungen in [9] und [22] bestä-tigen, dass die Vorgehensweise auf der sicheren Seite liegt. Da derzeit noch keine ausreichenden Untersuchungen zum Tragverhalten von Faserbeton auf Zug unter zyklischer Beanspruchung vorliegen, wurde die Zugspannung unter der seltenen Lastkombination auf die Erstrisszugspannung begrenzt.…”

Section: Berücksichtigung Der Besonderen Mechanischenunclassified