Specialists of the Testing Laboratory of the Ural branch of the FAA "ROSDORNIA" conducted tests of soil reinforced with ash and slag material in Buryatia. Samples of ash and slag waste were collected on the territory of the CHP-2 of Ulan-Ude, and soil samples were collected in the quarry of the Zaigraevsky district.
The soil mixed with ash and slag was used in the repair of a five–kilometer section of the road "Novoilinsk – Gorkhon – Kizha - border with the Trans-Baikal Territory". The materials were examined for compliance with GOST 23558-94 "Mixtures of crushed stone-gravel-sand and soils treated with inorganic materials for road and airfield construction".
The set of tests showed that the ash-slag material is suitable for use as a fine aggregate in crushed stone-gravel-sand mixtures and soils for capital and lightweight types of road clothes, in bases and additional layers of bases. The use of ash and slag waste from CHP-2 increased the physical and mechanical properties of the soil and strengthened the road foundation of the repaired road section.
According to the head of the Testing Laboratory Natalia Dedyukhina, the method of strengthening the soil with ash and slag waste is extremely promising for the field of transport construction. It allows you to save on cement, extend the service life of highways with the least financial costs and without loss of quality.
In Russia, about 70% of all electricity is generated by burning solid fuels – coal, shale, peat. As a result, about 50 million tons of ash and slag dumps are formed annually. Therefore, the use of solid fuel combustion waste also solves the problem of increasing environmental pollution.
"Our study revealed excellent strength characteristics and high frost resistance in ash and slag material from CHP-2," Natalia Dedyukhina said.
The frost resistance of the ash and slag additive corresponds to the F50 brand. This guarantees long-term and high-quality operation of the soil reinforced with it, even with significant temperature fluctuations to below minus 30 degrees.
The next stage of confirmation of laboratory studies of the ash and slag additive is the construction of a pilot road section with its use. At the moment, this issue is being worked out.
ROSDORNII, in order to expand the use of ash and slag in road construction, is studying technologies for their production and storage. The Institute regularly conducts laboratory tests of various samples for compliance with the requirements of regulatory and technical documentation, issues recommendations on improving the quality of ash and slag materials.