CEMENT QUALITY AND INDUSTRY EFFECTIVENESS
CEMENT
[:ru]Большаков Э. Л.[:en]Bolshakov, E. L.[:] [:ru]канд. техн. наук, председатель комитета по цементу, бетону и сухим смесям Российского союза строителей, президент ГК «АЛИТ», Санкт-Петербург, Россия[:en]Cand. Eng. Sc., Chairman on cement, concrete and dry building mixtures of the Russian Union of Builders, the President of GC “ALIT”, St. Petersburg, Russia[:]
Alitinform №2 (09) 2009 г. 84-87 p.
Abstract
The quality of cement and other raw materials used in the manufacture of ready–mix concrete, dry mixtures, prefabricated concrete and reinforced structures, is usually only discussed when there is a clear defect, collapse of structures or in emergency situations. Furthermore, deliveries of materials which do not match the claimed indicators and the homogeneity of cement quality from consignment to consignment are a serious economic factor, as they directly harm consumers of concrete and materials based on concrete. In this case, in order to ensure the quality of their own products, consumers are forced to increase expenses on cement by 5–10% of the optimal values, which leads to significant unjustified expenditure. According to our assessments, with the maximum volume of cement consumption in 2008, for the Russian Federation as a whole these expenses reached around 25 billion rubles. If one adds the problem of quality of inert materials, particularly sands, owing to the insufficient homogeneity of quality of initial materials, the customer pays considerable expenses.
Thus, the quality of cement directly affects work efficiency of the entire industry for manufacturing ready–mix concrete, prefabricated concrete and reinforced concrete structures and articles, and their customers. The manufacture of cement has a significant influence on the environment, and requires significant energy resources. This puts the problem of cement quality outside the Civil Codex of the Russian Federation, which determines relations between the seller and customer, and into the sphere of national strategic interests for energy conservation and ecological regulation. Therefore, the state must take a more active role in regulating issues of quality of cement and other materials which have a comparable importance in the spheres of energy and ecology.
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