Influence of various type of rock aggregates on selection of the working parts material in civil engineering

Abstract

In this paper are presented results of theoretical and experimental investigations and mutual comparison of various types of rock aggregates from the aspect of working parts wear of different machines for preparation and deposition of the rock materials on roads. Here are considered only the most important types of building stones: limestone, dolomite marble, calcite-dolomite marble and andesite, which are exploited at four sites in Republic of Serbia. Those aggregates are convenient for manufacturing of certain layers of the driveway constructions on roads, streets, airports, as the base layer on railways and for preparation of various types of asphalt and concrete. In selection of rocks for depositing on roads, it is necessary to know both their general and specific properties. It is necessary to conduct the mineralogicalpetrographic and physical-mechanical investigations and, if needed, certain special ones, as well. The civil engineering machines for manufacturing and building-in materials in various structural objects are exposed to different types of high loads, what is especially true for some of their working parts, which come into direct contact with the rock materials. The working life of those machines is directly dependent on the type of the building material as well as on maintenance. In exploitation, the construction mechanization is subjected to various types of corrosion and wear, and some of its parts are occasionally subjected to impact loads, as well. Certain parts are also frequently in contact with various types of stones, sands, soil, asphalt, concrete and occasionally with water.