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The article provides an analysis of the operating conditions of port facilities in heavy hydrometeorological conditions on the coast of Sakhalin Island to establish durability characteristics for the development of design life models. Typical types of concrete destruction in the zone of variable level are considered. The directions of research in the field of forecasting the durability of concrete and reinforced concrete structures for seaport facilities on actual durability characteristics are outlined.
Keywords:Concrete; Durability; Sea port facilities
The modern design concept of construction facilities according to operational characteristics implies a variable approach to the assignment of requirements to structures and materials for structures, which should guarantee the predicted service life while maintaining the economic feasibility of the service life . The principle of this design approach is set out and recommended for application in ISO 15686. This document is developed on the regulatory basis and practical studies conducted in the UK, Japan, Canada, the USA and the EU countries. Currently, the approach to designing the durability of structures according to performance characteristics is planned to be used in Russia . Obviously, the difference in the regulatory framework and the variety of climatic conditions of Russia is the main obstacle to the direct application of ISO 15686 in the design of construction projects in Russia. This article contains the results of a preliminary survey of the operating conditions of port facilities on Sakhalin Island.
Berthing facilities on the southern coast of Sakhalin are operated in difficult hydrometeorological conditions, which are most clearly manifested in the winter. The specificity of climatic conditions, which is due to the influence of the cold Okhotsk and warm Sea of Japan, creates, on the one hand, mild conditions for shipping - the port area does not freeze, on the other, harsh operating conditions for concrete: during four winter months, the concrete structure of port facilities in the variable level zone is subject to various freezing conditions. In accordance with the international and Russian classification of aggressiveness of
media [1, 3], these conditions belong to the most severe class - XF4 (strong water saturation in seawater and the effect of freezing). Hydrometeorological conditions of the southern part of Sakhalin are characterized by the following indicators . The sea in winter is the most turbulent - the average repetition of excitement is 35-50%, the height of the waves reaches 4-6 m. Tides are complex, but there are two main types: daily and mixed. The tidal wave enters from the south and southeast of the Pacific Ocean. In the southern part of the island, the tides are 0.8-2.5 m. In winter, the water temperature on the sea surface is about 0 °C. Salinity of water on the surface 31-33 %. Small meters and jokes in January and February are almost absent, the wind speed is usually 10-11 m/s. Design winter temperature of external air 17 – 19 °C below zero . A significant difference in the operating conditions of concrete in the zone of variable level makes it possible to trace the influence of three characteristic processes that occur during freezing:
slow one-way freezing of concrete of massive structures with gradual advance of the front into the concrete depth
quick comprehensive freezing of concrete of thin-walled structures with formation of ice in surface layers and blockage of water inside the structure
one-way freezing of porous material, in which it is possible to migrate water in a vapor-like state to a cold surface and form ice lenses by analogy of soil swell
The pictures show the operating conditions of concrete of
port facilities in the zone of variable level (Figure 1 a,b,c) and
characteristic damages of concrete (Figure 2 a,b,c,d,e,f). The
variety of damage types even in one structure (see Fig. 2) confirms
the variety of factors and mechanisms of destruction. Thus,
lifecycle patterns for a single design can vary significantly. This
is a major challenge for developing simple life prediction models
of concrete for practical applications. The study of the state of
real structures is the basis for determining the dominant factors
affecting the durability of concrete and determining durability
in frost conditions. In the Far East of Russia there is extensive
experience in the construction of offshore structures from
“classical” (without additional) concrete and “modern” concrete,
made using structure-forming additives [5, 6]. In the first case,
there are structures whose service life is 100 years, in the second
- the service life approaches 50 years. This experience has been
studied for 50 years and is, as a rule, the basis for the development
of new technological solutions  and proposals for modeling the
durability of concrete [8.9].
The special climatic conditions of the southern coast of
Sakhalin, the variety of types of port facilities, the long life of
the facilities and the variety of technological solutions for the
production of concrete works create a unique basis for fullscale
studies of the durability of concrete in order to develop
mathematical models for designing the facilities according to
operational characteristics. Mathematical constructions should
be based on deeply studied of physical and physicochemical
phenomena of concrete corrosion. Therefore, for the construction
of mathematical models, it is important to establish the patterns
of concrete degradation in real operating conditions of structures
and to determine indicators characterizing the durability of
concrete in operating conditions.
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