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2013WinShotcreteEMag

Fig. 5: Mounting of strips–control joints access would have been the best solution; however, Politicians from many different countries were we had to rule it out because wall layout required interested in the construction of the MHPJ. permanent geodetic survey of the spatial location of Implementation of the project coincided with U.S. the wall. Light and heavy man-lifts and scissor lifts President Barack Obama’s visit to Poland. Presi- were used. To get access to the highest wall elements, dent Obama paid homage to Jews at the Monu- a temporary platform was installed to which a crane ment of the Warsaw Ghetto Heroes that is situated track was mounted with a suspended scaffold. This adjacent to the museum (refer to Fig. 9). wall access solution made setting-out, control, and The unique combination of shotcrete appli- verification of the shotcrete surface upon shooting cation technology to form the wall’s curvature much easier for the client (refer to Fig. 6). and the selection of materials resulted in excep- The as-built tests referred to confirming of the tional quality of the structure and a durability that assumed concrete class (minimum C30/37 as per exceeds the standard life span of a building. PN-EN 14487-1, -2: 2007 Sprayed Concrete). The assumptions made concerning the substruc- ture (rigidity), method of load carrying transfer from wall elements, and joint expansion width of 0.4 in. (10 mm) between the elements proved right. The wall scan made by the wall supervision company was compared to the design assump- tions. The comparison proved we had achieved a unique precision of wall execution, expressed in millimeters of deviation (refer to Fig. 7 and 8). Completion of the curvilinear wall took 13 months, which included basic structural work and several months of finishing work. All the emerging problems (performance-related, techni- cal, and others) were solved on-site with our labo- ratory and Research & Development Unit during hours of meetings and practical tests. Finally, all wall work was completed in August 2012. The exemplary cooperation of the architect, Professor Rainer Mahlamäki and his team, in solving the details, not to mention problems and conflicts that emerged, deserves credit. Fig. 6: Execution of top part of the wall Shotcrete • Winter 2013 15


2013WinShotcreteEMag
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