Associate Professor at the Department of Technology of Construction Materials and Metrology Dmitry Panteleev completed the research work "Crack resistance of dispersion-reinforced concrete after high-temperature heating" as part of the grant competition for the implementation of research work by scientific and pedagogical workers of SPbGASU in 2025.

Every year in Russia there are many fires in buildings and structures. Their number can be reduced by increasing the requirements for the structural safety of buildings. For this, when designing, in addition to calculating the load-bearing structure for strength, it is also necessary to carry out a fire resistance calculation to guarantee the preservation of the load-bearing capacity in fire conditions for a specified time.

In case of fire, high fire resistance of building structures is a guarantee not only of the structural integrity of the building, but also of the safety of people. After the fire starts to affect the structure, concrete can explode, breaking off from the heated surface in plates. Pieces of peeling concrete fly off with a bang to a distance of up to 10 m.

During the research, fibre-reinforced concrete compositions were designed and manufactured to determine their properties after exposure to high-temperature heating.

It was found that the use of steel fiber can increase the crack resistance and fracture toughness of concrete structures, thereby making them safer in the event of a fire, while the use of synthetic microfiber helps to avoid explosive destruction.

As a result of the research, effective versions of fiber concrete were developed using high-modulus steel and low-modulus synthetic fibers to obtain highly fire-resistant concrete, to increase their technical and economic efficiency, reliability and operational safety of building and structure structures.