Application of a cusum control system for enhanced robustness of the flow properties of self-compacting concrete
- Control chart systems are used in quality management systems to keep production processes stable. In concrete production they are often applied for the control of the compressive strength. The most efficient control chart systems are cumulated sums (cusum), which help to observe deviations from a targeted value. Unlike alternative observation chart systems that focus on process data evaluation, cusum observations react very rapidly on systematic process changes in processes. Therefore, the cusum method is particularly suitable if immediate counteractions have to be taken, like in the case of fresh concrete properties of self-compacting concrete (SCC), which can have severe influences on the durability and mechanical strength of concrete. The rheology of SCC can be affected by an enormous variety of influencing factors, from raw material properties to handling or environmental temperature. The present study shows that regardless of the material based influencing parameter for a rheologyControl chart systems are used in quality management systems to keep production processes stable. In concrete production they are often applied for the control of the compressive strength. The most efficient control chart systems are cumulated sums (cusum), which help to observe deviations from a targeted value. Unlike alternative observation chart systems that focus on process data evaluation, cusum observations react very rapidly on systematic process changes in processes. Therefore, the cusum method is particularly suitable if immediate counteractions have to be taken, like in the case of fresh concrete properties of self-compacting concrete (SCC), which can have severe influences on the durability and mechanical strength of concrete. The rheology of SCC can be affected by an enormous variety of influencing factors, from raw material properties to handling or environmental temperature. The present study shows that regardless of the material based influencing parameter for a rheology change, a steady slump flow can be achieved only by adding supplementary superplasticizer in case of loss of flow and adding stabilising agent (ST) in case of increased flow if the respective V-mask indicates a systematic change. A reference SCC was artificially manipulated in order to achieve realistic experimental data for flowability and flowability changes due to changes in the raw material properties. The results point out that productions with applied cusum methods were capable of keeping the target slump flow deviation within approximately 1% only, while productions without applied cusum method deviated up to 14% and more from the target.…
Autor*innen: | Wolfram SchmidtORCiD |
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Persönliche Herausgeber*innen: | Hans Beushausen |
Dokumenttyp: | Beitrag zu einem Tagungsband |
Veröffentlichungsform: | Verlagsliteratur |
Sprache: | Englisch |
Titel des übergeordneten Werkes (Englisch): | fib Symposium 2016 - Performance-Based Approaches for Concrete Structures |
Jahr der Erstveröffentlichung: | 2016 |
Herausgeber (Institution): | Fédération internationale du béton ( fib) |
Verlag: | Fédération internationale du béton ( fib) |
Verlagsort: | Lausanne, Switzerland |
Erste Seite: | 106-1 |
Letzte Seite: | 106-10 |
DDC-Klassifikation: | Naturwissenschaften und Mathematik / Chemie / Analytische Chemie |
Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurbau | |
Freie Schlagwörter: | Concrete; Self-compacting concrete; control chart; cusum; quality control; robustness |
Veranstaltung: | fib Symposium 2016. Performance-Based Approaches for Concrete Structures. |
Veranstaltungsort: | Cape Town, South Africa |
Beginndatum der Veranstaltung: | 21.11.2016 |
Enddatum der Veranstaltung: | 23.11.2016 |
ISBN: | 978-2-88394-121-2 |
Verfügbarkeit des Dokuments: | Datei im Netzwerk der BAM verfügbar ("Closed Access") |
Datum der Freischaltung: | 14.07.2017 |
Referierte Publikation: | Nein |