Försöksmetod för automatisering av kvalitetssäkring av SKB

• Main Authors: Yazdani, Niloofar, Ekasriouen, Samir
• Format: Others
• Language: Swedish
• Published: KTH, Byggteknik och design 2012
• Online Access: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-101834

Within all industries, there is a change in working time required; this also includes the construction sector. However, the way construction sectors are differentiated is by not having been given the opportunity to be practiced or tested.  The aim of this thesis that we have done in collaboration with the Concrete Industry was to investigate the possibility of developing an automated method for quality assurance of SKB at the site. The idea is to make the O-funnel to be more utilized and therefore ensuring that the appropriate concrete quality is provided which eventually would lead to a better development in the production process. The project has involved theoretical work and laboratory experiments. The theoretical work gave us a good foundation at the beginning of the project. After gathering the information and material, the laboratory experiments began by SCC in their laboratory in Hammarby. The collected data from the various laboratory tests formed the foundation for trying to relate measurements for consistency of SCC with each other and therefore find out how measurements from O-funnel varies with different concrete mixtures. A big part of the work was performed in the laboratory where the test methods T50, slump flow, and O-funnel were used. These measurement methods would give us concrete viscosity and slump flow, and correlation between these parameters. The result of these tests showed that the O-funnel is not consistent with the theory.O-funnel showed a clear respond with the separation in the concrete. In this case, the concrete was stocked in the O-funnel or was constantly giving very high outflow times.  However, if the concrete is too stiff, the O-funnel can give false values. O-funnel does not capture variations of floating-way measurements well enough but it does describe the viscosity of the best, meaning the T50-value. It is difficult to say what this was dependent on but one reason may be that the recipe from the first part gave very low T50 values.