Edwin P. Alexander's American locomotives: A pictorial record of steam power PDF
By Edwin P. Alexander
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Extra info for American locomotives: A pictorial record of steam power 1900-1950
2 Roller Compaction To meet these problems a roller compacting machine as it is shown in figure 2 was constructed. It consists of a steel roller which can be heated up to about 80°C and of a vibrator which can be turned on independantly. The roller is driven by an hydraulic actuator with all the possibilities of a dynamic function generator for amplitude, freqency and type of function. Depending on the mix proportions and the thickness of the layer the compacting procedure can be varied also by adjusting the weight of the roller and the vibrating force over a wide range.
Also, the results indicated that the density distributions across and along the AMIR compacted sections are more uniformly distributed as indicated by the lower values of the standard deviation and coefficient of variation. It should be noted that each value given in the tables, represents the average of three core specimens. The data is organized according to the distance between a core-set and the outside edge of the paved lane. For example, the first row in Table 1 corresponds to a set of cores 300 mm off the edge of the pavement, while the last row in the table provides the data of the closest core-set to the longitudinal joint between the AMIR and Conventional compacted sections.
It consisted of four test sections as described below: a. 8 meter wide, compacted by the AMIR prototype. b. ). c. 8 meter wide, compacted using AMIR. d. 8 meter wide, compacted using the steel drum roller. Only the static steel roller was employed in the Toronto Trial. The main objective of the Toronto field trial was to evaluate the ability of the AMIR compaction method in comparison to the static steel compaction method under the same number of passes. 2 Ottawa I The results of the Toronto field test led to the second field test in Ottawa.
American locomotives: A pictorial record of steam power 1900-1950 by Edwin P. Alexander