Shewhart‐ und CUSUM‐Kontrollkarten zur gleichzeitigen Prozesssteuerung und Konformitätsbewertung

Schmidt, Wolfram; Kühne, Hans‐Carsten; Haamkens, Frank

doi:10.1002/best.201400007

Cited by 5 publications

(2 citation statements)

References 4 publications

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“…A so called V-mask helps to assess whether trending curves show critical trends or not [14][15][16]. It ideally provides very clear decision rules whether counteractions must be taken or not.…”

Section: Cmss-2017mentioning

confidence: 99%

“…Caspeele and Taerwe proved that depending upon the parameters of the V-mask both conformity control and quality control can be achieved, but a tailoring of the V-mask to the production target value is required [16]. However, these recommendations were not considered in EN 206, so that the recommended standard method of EN 206 is not a feasible tool for process optimization [14,24].…”

Section: Cusum Process Control In Concrete Technologymentioning

confidence: 99%

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Concrete casting robustness improvement due to active rheology

2018

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Abstract. With ongoing innovation in process technology, the challenges of concrete technology are more and more focused on the rheological optimisation for these processes, since improper mixture stability or poor compaction ability negatively affect the concrete homogeneity and quality. However, along with the increasing complexity of today's concrete mixture compositions, concrete becomes more prone to failure regarding the casting process. Variable properties of the raw materials typically cause changing workability. The reasons can be found among others in scattering water contents, physical or chemical properties of the cement or varying environmental temperatures. Robustness in the delicately adjusted rheology, however, is of utmost importance for modern and future process technology, from sprayed concrete over pumpable concrete towards 3D-printing, with regard to the long-term strength, the function and the durability. Typically, material induced changes cannot be identified easily due to the complex interactions of concrete constituents. Therefore, a precise and prompt counteraction is impossible. However, it is known that the yield stress can be controlled by addition of supplementary superplasticizer or stabilising agent. In combination with computerized process observation tools that can rapidly interpret and react on changes in the rheology, it is therefore thinkable, that only these two admixture types can adjust the rheology steadily and permanently, regardless of the actual root cause for observed macroscopic rheology change. The presentation will firstly give a comprehensive overview of effects at the interface between pore solution, particles and hydrates, which affect the rheology of fresh concrete. Secondly, ways are recommended how the rheology can be actively manipulated before eventually computerized methods are demonstrated that help to actively and rapidly assess and counteract performance scatter during steady casting processes.

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Section: Cmss-2017mentioning

confidence: 99%

Section: Cusum Process Control In Concrete Technologymentioning

confidence: 99%