Abstract
The possibility of using polydisperse steel-smelting slag for the production of type B asphalt concrete is investigated, the possibility of its use as a mineral powder, crushing screening and crushed stone is considered. As a result of the study, it was found that a promising area for the use of slag raw materials in the technology for the preparation of asphalt mixes is: as a mineral powder - without additional processing steps; crushing screening - with the development of additional technological operations. The use of raw materials as crushed stone is impractical because of the high average density of the final asphalt mixture. Based on the test results, the characteristics of the fatigue properties of asphalt concrete from fine-grained dense mixtures of type B made on mineral powders from slag and limestone were obtained. It was established that at the initial moment, a large number of cycles to failure are characterized by compositions on slag powder, however, samples from this series tested after 45 days showed a significant rigidity increase and were destroyed earlier than similar samples on limestone. Obviously, this phenomenon is associated with an increase in the brittle properties of the material due to the formation of crystallization-condensation bonds in the structure of asphalt concrete containing slag.
Highlights
Steel-smelting slag is a product obtained due to the melting of fluxing rocks, which include limestone or lime
When using limestone mineral powder, the set of hardness occurred in the expected range and amounted to no more than 12% of the initial value, while samples with slag 2 showed a rapid increase in the test parameter and embrittlement
Such studies are relevant, allowing a comprehensive approach to solving a number of problems: man-made mineral materials are a source of inexpensive and often prepared raw materials which leads to energy savings, in addition, it opens the possibility of unloading numerous dumps and landfills liberating fertile lands
Summary
Steel-smelting slag is a product obtained due to the melting of fluxing rocks, which include limestone or lime. The widespread use of steel-smelting slag is associated with the solution of a number of environmental problems and the rational use of resources, due to the partial replacement of traditional mineral raw materials with slag This helps to reduce the extraction and processing of natural stone materials. The use of technogenic raw materials in the production of building materials and structures makes it possible to reveal their useful and unique qualities, for example, such as the energy potential of the surface or structural features of the crystal lattice and chemical composition Such an approach allows one to obtain products with sufficiently high physical, mechanical and operational characteristics, and sometimes with a unique set of properties. It is known that technogenic raw materials are significantly different from traditional ones in chemical, mineralogical composition, these raw materials are often heterogeneous, in each case it is necessary to conduct studies to assess the possibility of using industrial waste
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