According to the conclusions of the FAA "ROSDORNIA" on the Northern bypass of Omsk, during the construction of the road, ash-slag mixtures of local thermal power plants can be used as part of the bearing layers of the pavement base. The planned volume of use of waste from coal–fired thermal power plants is 7.6 million tons. These provisions were announced at a workshop held on May 17, 2021, chaired by Stanislav Naboko, Director General of the Institute. The technical conclusion was presented by Ekaterina Bryazgina, Acting Deputy Director of ROSDORNIA, and Svetlana Kovrigina, Deputy Head of the Design Department. The meeting was attended by representatives of Stroyservice, one of the largest contractors in the field of road construction.
As the participants of the meeting noted, Russia currently has the necessary regulatory framework for the implementation of construction projects using ash and slag materials, but their number is still small. The problem lies in the lack of stable motivation of contractors, design and construction organizations, as well as in the unstable the quality of the ash and slag materials themselves: in fact, the production waste of each CHP requires an individual approach, which complicates their application.
Using many years of experience in the study of this issue, ROSDORNII is ready to assume the functions of a certification body for ash and slag waste of specific thermal power plants in order to assess their physical and mechanical properties and develop recommendations for use. At the moment, the issue of the use of ash and slag materials has been considered by ROSDORNII as part of a complex of pre-project works on the Northern Bypass of the city of Omsk, carried out by the Institute for the Management of the Road Economy of the Omsk region.
"We have developed constructive and technological solutions for the use of ash and slag waste from Omsk CHPP-4 and CHPP-5 in the construction of the roadbed and in the construction of the bearing layers of the foundations of road clothes, developed technological schemes for the use of these materials and transport and logistics schemes for their transportation to the construction site. The estimated total volume of ash and slag use is about 5.9 million cubic meters or 7.6 million tons. Specific technical solutions will be offered in as part of the preparation of design and estimate documentation," Ekaterina Bryazgina noted.
According to the participants of the meeting, the use of ash and slag in the construction of highways is one of the promising areas of road activity and allows solving several topical issues at once:
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Accelerate the process of recultivation of ash dumps and normalize the ecological situation in their locations;
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To find a replacement for local soils used in road construction (mainly loam) that do not meet the required criteria;
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Reduce the amount of soil sampling for road construction needs, especially from land suitable for agricultural use and requiring subsequent reclamation.
Materials based on ash and slag waste can be used for the construction of the roadbed, as part of various layers of road clothing, as well as for solving a number of related tasks, both in the construction of new roads and in the repair of existing ones. This problem is relevant for many regions of the Urals, Siberia and the Far East.
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