Application of steel fibre reinforced concrete for ensuring concrete frost resistance of transport structures on regional and inter-municipal highways of Khabarovsk Krai motor roads of Khabarovsk region

Abstract

In this paper the authors present the research results into the application of steel fibre reinforced concrete for ensuring frost resistance and durability of transport structures on regional and intermunicipal highways of Khabarovsk Krai. The object of the present research was concrete of reinforced concrete round culverts rings 3D 15.35 (GOST 24547-2016, OST 35-27.0-85), produced at the industrial and production enterprise CJSC «Khabarovsk Avtomost» in Khabarovsk. Pipe blocks are designed for use in the construction of culverts under motorway bankets (including industrial roads), built in areas with seismicity up to nine points in all climatic zones on periodically operating watercourses in the absence of ice. Concrete class on strength of compression is accepted by designers — B25, according to SP 35.13330.2011 (new edition of SNiP 2.05.03-84*) the grade of concrete matrix on frost resistance was assigned taking into account the average temperature of the coldest month in the area where the construction is planned. In the conditions of the region under consideration there are natural and climatic conditions for assigning the grade of frost resistance F300. One of the tasks solved by the authors was the selection of concrete composition taking into account qualitative features of initial local materials properties and the use of dispersed reinforcement, providing the concrete of transport structures with a given strength, frost resistance and water resistance. The authors have presented the strength determination results, frost resistance and waterproofing of steel fibre reinforced concrete with «PFM-NLK» and steel fibre for reinforced concrete round culverts rings 3D 15.35. The experimental studies results allowed to justify the use of steel fibre reinforced concrete for ensuring frost transport structures resistance on regional and intermunicipal highways of Khabarovsk Krai, which is a determining factor for increasing their durability. The obtained results are applied for the standard of the organisation development — CJSC «Khabarovsk Avtomost» — 002-2015 «Increase of frost resistance of concrete of transport constructions on regional and intermunicipal highways of Khabarovsk region».