Details
| Titel in Übersetzung | De-airing and compaction behaviour of fresh concrete - Fundamental mechanisms and building component properties |
|---|---|
| Originalsprache | Deutsch |
| Seiten (von - bis) | 434-445 |
| Seitenumfang | 12 |
| Fachzeitschrift | Beton- und Stahlbetonbau |
| Jahrgang | 120 |
| Ausgabenummer | 6 |
| Frühes Online-Datum | 2 Mai 2025 |
| Publikationsstatus | Veröffentlicht - 19 Juni 2025 |
Abstract
De-airing and compaction behaviour of fresh concrete – fundamental mechanisms and building component properties. The compaction behaviour of fresh concrete is a decisive characteristic in the production of high-performance and durable concrete components. It affects not only the mechanical properties and durability of the finished component, but also its aesthetics. Until now, however, the compaction behaviour can only be described indirectly by defining a consistency class of the fresh concrete, assuming that the compaction behaviour improves with increasing consistency. This approach, however, is impeded by the use of innovative concretes with reduced water content, as such concrete may have significantly altered rheological properties, which greatly affect the ability of air bubbles to rise in the fresh concrete. The objective of this paper was therefore to present new investigations on the fundamental mechanisms of air bubble rise in cement paste and mortar. This is followed by large-scale component tests in which the influence of compaction frequency and compaction time on surface porosity, compressive strength and microstructure porosity in hardened concrete were investigated. By linking the investigations of the basic mechanisms of air bubble rise with the transferability of the results to large-scale practical construction tests for concrete compaction, new insights into proper concrete de-airing can be demonstrated.
Schlagwörter
- compaction, component, de-airing, fresh concrete, rheology, vibrations
ASJC Scopus Sachgebiete
- Ingenieurwesen (insg.)
- Bauwesen
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in: Beton- und Stahlbetonbau, Jahrgang 120, Nr. 6, 19.06.2025, S. 434-445.
Publikation: Beitrag in Fachzeitschrift › Übersichtsarbeit › Forschung › Peer-Review
}
TY - JOUR
T1 - Entlüftungs- und Verdichtungsverhalten von Frischbeton
T2 - Grundlegende Mechanismen und Bauteileigenschaften
AU - Strybny, Bastian
AU - Schack, Tobias
AU - Link, Julian
AU - Deiters, Macielle
AU - Haist, Michael
N1 - Publisher Copyright: , Ernst und Sohn. All rights reserved.
PY - 2025/6/19
Y1 - 2025/6/19
N2 - De-airing and compaction behaviour of fresh concrete – fundamental mechanisms and building component properties. The compaction behaviour of fresh concrete is a decisive characteristic in the production of high-performance and durable concrete components. It affects not only the mechanical properties and durability of the finished component, but also its aesthetics. Until now, however, the compaction behaviour can only be described indirectly by defining a consistency class of the fresh concrete, assuming that the compaction behaviour improves with increasing consistency. This approach, however, is impeded by the use of innovative concretes with reduced water content, as such concrete may have significantly altered rheological properties, which greatly affect the ability of air bubbles to rise in the fresh concrete. The objective of this paper was therefore to present new investigations on the fundamental mechanisms of air bubble rise in cement paste and mortar. This is followed by large-scale component tests in which the influence of compaction frequency and compaction time on surface porosity, compressive strength and microstructure porosity in hardened concrete were investigated. By linking the investigations of the basic mechanisms of air bubble rise with the transferability of the results to large-scale practical construction tests for concrete compaction, new insights into proper concrete de-airing can be demonstrated.
AB - De-airing and compaction behaviour of fresh concrete – fundamental mechanisms and building component properties. The compaction behaviour of fresh concrete is a decisive characteristic in the production of high-performance and durable concrete components. It affects not only the mechanical properties and durability of the finished component, but also its aesthetics. Until now, however, the compaction behaviour can only be described indirectly by defining a consistency class of the fresh concrete, assuming that the compaction behaviour improves with increasing consistency. This approach, however, is impeded by the use of innovative concretes with reduced water content, as such concrete may have significantly altered rheological properties, which greatly affect the ability of air bubbles to rise in the fresh concrete. The objective of this paper was therefore to present new investigations on the fundamental mechanisms of air bubble rise in cement paste and mortar. This is followed by large-scale component tests in which the influence of compaction frequency and compaction time on surface porosity, compressive strength and microstructure porosity in hardened concrete were investigated. By linking the investigations of the basic mechanisms of air bubble rise with the transferability of the results to large-scale practical construction tests for concrete compaction, new insights into proper concrete de-airing can be demonstrated.
KW - compaction
KW - component
KW - de-airing
KW - fresh concrete
KW - rheology
KW - vibrations
UR - http://www.scopus.com/inward/record.url?scp=105004171475&partnerID=8YFLogxK
U2 - 10.1002/best.202500006
DO - 10.1002/best.202500006
M3 - Übersichtsarbeit
AN - SCOPUS:105004171475
VL - 120
SP - 434
EP - 445
JO - Beton- und Stahlbetonbau
JF - Beton- und Stahlbetonbau
SN - 0005-9900
IS - 6
ER -