Difference Between Asphalt & Bitumen | Bitumen vs Asphalt | NK Asphalt
If you wonder why we go so far off into the weeds about Bitumen, bituminous, and not just jump straight to asphalt, it is because before the 1970s asphalt was very commonly referenced as Bitumen by the companies producing the equipment and throughout the various literature covering the handling procedures of this product. Whatever it is, it is now called asphalt, but do not be surprised by a Bitumen or Bituminous reference here or there.
What is available in HO scale, you might ask?
Here's Walter's Black Gold Asphalt batch plant, as it appeared on the old club layout. It has reappeared on the new club layout, but the club has parsed it down because it doesn't all fit the pace and if you don't know what the components are, you may not think they are all necessary. For a proper plant, the combination and composition of the equipment matters rather very much, they are not so randomly arranged as they might seem!
This scene was nice enough before my new found knowledge, but things have changed. The hoppers with feeder to the right is supposed to feed the black cylinder below the dust collector, and we're using a set of elevators to do it, the smaller unit is hiding behind the oil tank. The output from this dryer then enters the hot elevator which takes it to the top of the plant. There it feeds it into a mixer where oil from the tank in the foreground is pumped via pipes into the pugmills and the aggregate solution is then read to exit the discharge hoppers into awaiting trucks...or...rail cars?
It turns out that your asphalt mix could indeed be delivered directly to a railroad source into gondolas to be delivered wherever the railroad goes. I would presume this would be a cold mix by the end of processing and perhaps rewarmed on site or through a facility closer to the destination.
Yes, I thought the same thing when I first saw this, "They didn't put finished asphalt in gondolas...." but there you have it, right in undated (1940s-1950s) company literature.
You can see some of the aforementioned pieces of equipment, such as the oil source (29), the feeder conveyor from the Charging Hoppers (2), the Dryer (7), the dust collector (9), the hot mix elevator (11), the overhead bin (15), the pugmill mixer (19), and the discharge gate (19).
Now you might ask just what does the Walther's kit have in common and what is it missing, and I dare say someone at Walthers possibly combined the ground handling equipment of an asphalt plant with a cement discharging tower!! Yes, that tower in Black Gold would more appropriately be a Redi-mix cement outfit and Not a Black Gold Asphalt plant!
The G series (G50C or so) plant in the previous pictures is a very handsome unit, and it would be a fine project, but for now I have chosen a more modest machine: the Cedarapids Model OM-S Omnimixer.
This little portable unit could be set up at any convenient location between the aggregate source and the work site. I officially started this little unit when I went to Thailand in the summer of 2019, and so it has been a long haul to get to where I am now.
One source of recently realized aggravation has been the fact that while my brochure with decent pictures is from 1962, the detailed dimensional drawing of two sides of the plant is from 1965, and some details were either changed or simply omitted by the draftsman to avoid confusion or oversharing plant details. Never the less, I have persevered, above all else against a rambunctious attention span fed by a marathon sessions that run until modeler's fatigue sets in (or bed time comes due, the worst interruption ever) and then no progress happens on one project for weeks because it's just not the most interesting thing at the moment
I started this week with having to finish integrating the feeder above the pugmill, figure out the upper bitumen metering pump, finish the integral electric motor drive, draw the aft inner end of the pugmills, draw the interlocking transfer drive, and finish off the hot elevator. And then I had to finish off the wheels, because this is a new wheelset and I Hate Painting one piece wheel rim-tire assemblies...and here's where we are at:
As of now, there's this small matter of getting the detail on the backside of the pugmill, which will be only barely viewable under the feeder and behind the power unit in the picture above, and then finishing off the bitumen metering pump again under the feeder but towards the opposite side of the machine, and it will be...done?
I might finish another project in 2020?!
Two and a half more weeks, and it's Here we come, 2021!!!