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pp. 12763-12769 | Article Number: ijese.2017.001
Published Online: January 03, 2017
Abstract
The article reviews existing systems of automation for thermal processes of drying out some ingredients of road concrete mix. Automation of processes of thermal treatment comes down to multiple parameter, however one-level system, owing to which achieving of optimal result is almost impossible. Therefore, either analysis or the development of more advanced ways of automated control by thermal objects of coating plants that enable to reduce energy consumption, as well as refinement of mixture, have become very essential. It has been detected that a very important parameter of both technologies turns out keeping up permanency as to fraction composition and purity of inorganic materials at stock-piles of Coating Plants. It can be achieved by stock-pile of inorganic materials on an area covered with concrete or bitumen concrete, as well as by arranging of parting layers to bar from fraction mix between stock-piles. Dose accuracy for inorganic material, mineral fines and natural asphalt, therefore, deviations in nominal mix reflect the main causes of obtaining mix of inadequate quality; attaining of such parameters are to be achieved by batcher scale for inorganic materials, mineral fines, and natural asphalt on embedment gauge. It has been determined an accuracy of time for «dry» and «wet» admixing of bitumen concrete constituents of mixture in the blending tank; attaining of such parameter is to be achieved by inserting the admix signal generator into Automatic Process Control System. It has been discovered that cross-section dimensions of the storage bin in a plan, the extension of which leads to segregation of coarse grain gravel in mixture that bring down either soothness or quality of mixture; attaining of such parameter is to be achieved by applying of narrow storage bin or by extraction of mixture over the surface of broader storage bins excluding formation of broad cone mixture, triggering the main push to segregation. It has been evaluated the storage time for bitumen concrete mixture in the storage bins as due to long-time storage of mixture effects upon natural asphalt performance, whereas at a lowered temperature, it prevents from extraction; attaining of such parameter is to be achieved by bining only the required amount bitumen concrete mixture for the time of the work shift.
Keywords: Сoncrete bitumen mixture; automation of Asphalt Concrete Mixing Plant (АCMP); thermal objects; production activity.
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