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Rapid evaluation method of subgrade performance using Portable Falling Weight Deflectometer

Bu Bo, Shang Huayu, Liu Shaoping, Liu Ke

Archives of Civil Engineering

2023

Vol. 69, nr 4

619--633

The performance evaluation of new and old subgrades is critical for the quality and safety of reconstruction and extension projects. It is necessary to achieve rapid and easy performance testing. In this study, a Portable Falling Weight Deflectometer (PFWD) is chosen to rapid evaluate the performance of subgrade. First, a testing area, the reconstruction and expansion project of the Hefei to Dagudian section of the Shanghai-Shaanxi Expressway, is selected. Then, the PFWD modulus Ep of resilient tested by PFWD and the corresponding water content w and compacting degree K tested by the cutting ring method for old subgrade are obtained. And the correlation relationship between Ep and w and K is established. The performance of old subgrade can be rapid obtained by PFWD. Meanwhile, for the new subgrade, the correlation relationship between Ep and bending value L, w and K is established, and the performance can also be rapid tested by PFWD. Finally, a rapid evaluation method for the reconstruction and expansion of subgrade performance was proposed, which aims to provide technical support for ensuring construction quality and safety and provides a technical reference and a theoretical basis for the prediction of similar subgrade performance.

Sensible Hospital. On the competition for the extension project of the National Parturient Clinic in Poznań

Paradowska A.

Architectus

2008

Nr 2(24)

39--49

There were many architectural design competitions in the interwar times. They usually referred to the biggest and most prestigious construction undertakings; residential projects, ministerial buildings, offices and institutions, urban planning initiations and churches. Although very often the winning projects were not implemented, their publishing with comments in the professional press was a significant element in the discussion on the shape of the 'new' Polish architecture. In the scope of hospital building the competitions which were announced were often closed competitions; the invitation itself to participate in the competition was in fact an appreciation of the architect's achievements and his position in the professional community.