In the diploma thesis, we undertook research in the area of soil compaction, focusing in particular on the differences between the standard Proctor test (SPT) and the modified Proctor test (MPT). This included a detailed review of both versions of the methodology and the results obtained. As a fundamental principle of geotechnical engineering, soil compaction plays a key role in shaping the durability and stability of embankments and, indirectly, other geotechnical structures. Both SPT and MPT serve as essential tools in understanding the compaction characteristics of various soil types and assist engineers in making informed decisions during construction. Our research has shown that while the main goal of both tests remains consistent – to achieve maximum dry density with optimal moisture content – the paths to achieving this goal differ significantly. Designed to mimic densification scenarios in the field, the SPT uses a lower densification energy and densification in three layers approach. On the other hand, MPT offers higher densification energy and densification in five layers. Our findings highlighted differences in optimum moisture content and maximum dry density under different conditions. The constant energy approach used in SPT and MPT shed light on the distinct influence of mold size on densification efficiency. Larger molds gave higher densities at relatively lower moisture contents, illustrating the role of particle arrangement in achieving densification. This research revealed to us the influences of SPT and MPT densification energy and also offered reasons for the observed differences.
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