Posts Tagged ‘equipment’

Russian Enterprises

A well-known Russian proverb reminds us that the condition of the roads in Russia leaves much to be desired. It originated in the 19th century, but is relevant in our time. Progress has never stood on the site from a simple paved roads, we turned to asphalt. However, this problem did not end. In modern industrial plants many challenges and most importantly – it is the right savings and resources, as well as hardware upgrades.

The purpose of this article – To tell about a computer control system of asphalt plants. Automating processes in our time means not only moving forward, but also significant cost savings, increase in the performance. Leading enterprises of Russia, as well as many other countries (eg USA, Japan, Finland) by automating the production not only increased the quantity and quality of products, but also saved a lot of money. There is a myth that mixing equipment is better west of the domestic. It is not. The truth is that the best examples we have produced asphalt facilities in no way inferior to not only the German and Finnish, and Italian counterparts. With the development of a market system in Russia are faced with such a phenomenon as the stiff competition that has affected all industries. That is why determining factors in the fight against foreign and domestic competitors have the quality and speed of production. Unfortunately, nowadays Russian factories is difficult to reconcile these two factors, so industrial market leading foreign companies (for example, Simem – Italy, Liebcher-Germany).

Winter and Concrete

There are two main methods of winter concrete work: with heating (including electrowarming) and with pro- supplements. Warming up is especially helpful when a sufficiently large arrays of monolithic concrete. For narrow joints this method can not be recommended because it is not enough to warm the actual concrete seam, it is necessary to ensure a positive temperature adjacent arrays of prefabricated elements, intensely consuming the heat from the concrete joint. In addition, warming (particularly elektroprogrev) narrow joints leads to rapid drying of concrete, quality of welds obtained in this unsatisfactory. The most useful when frosts, reaching -30 C, to zamonolichivanie seams with antifreeze additives.

This allows virtually year-round in most parts of the North. Antifreeze additives must meet the following basic requirements: have a wide temperature range of their possible use; provide enough intensive growth of concrete strength at low temperatures, to ensure workability (Adaptability) of concrete with additives, to improve, at least, not to reduce the frost resistance of concrete, be economical and affordable. The most affordable and accessible additives are a mixture of calcium chloride and sodium. However, they can not be recommended as it causes corrosion of reinforcement. Common antifreeze additives are potash and sodium nitrite, and mixtures thereof. These additives can cause alkaline corrosion of concrete, in addition, the use of sodium nitrite leads to some reduction in water resistance and fracture toughness of concrete. Potash is added to the concrete at temperatures up to -30 -35 C, sodium nitrite – -10 C in the following amounts (% by weight of cement).