Seawater has a significant impact on hydrotechnical concrete structures in the Port of Klaipeda. This factor must be properly examined and evaluated designing reinforced concrete structures exploited in seawater. The basic aim of research is to assess the effects of seawater on concrete and to form an algorithm for studying the durability of hydrotechnical structures affected by seawater. The conducted investigation showed the impact of seawater on hydraulic engineering (concrete) structures.Serious defects are caused by corrosion in hydrotechnical concrete. The key factors indicating the durability index of hydrotechnical concrete include damage to the concrete due to environmental, mechanical and physical-chemical effects.Physical-chemical environmental effects occur due to changes in temperature, the speed of the wind and fluctuations in the sea-level. Multiple environmental impacts can simultaneously affect hydrotechnical concrete.Mechanical external effects occur due to constant stevedoring works and vessels moored at the Port of Klaipeda.

Statyba Civil Engineering JÜRINEJE APLINKOJE EKSPLOATUOTO HIDROTECHNINIO BETONO SAVYBiy ANALIZÉ Ramunè Lebedeva Vilniaus Gedimino technikos universitetas El. pastas Ramune dok@yahoo.com Santrauka. Jûrinèje aplinkoje eksploatuojamam hidrotechniniam betonui didelç [tak^ turi aplinkos poveikiai: oro temperatûros svyravimai, juros vandens temperatûros svyravimai, vejo kryptis ir greitis. Visi aie veiksniai turi bûti iätirti ir vertinami projektuojant hidrotechninin betonii, eksploatuojamii juros vandenyje, sudètis. Darbo tikslas -[vertinti jûrinèje aplinkoje eksploatuojamo hidrotechninio betono savybes bei atlikti paveiktiijuros vandens hidrotechniniii betonii savybiii analizç, pateikiant JH projektavimo rekomendacijas. Atlikta juros vandens ir Danes upes vandens poveikio hidrotechniniam betonui analizé savybiti palyginimas. Reiksminiai zodziai: Klaipèdos uostas, hidrotechninis betonas, vandens poveikis, analizé, ilgaamziskumas.

Abstract. Hydrotechnical constructions in Klaipeda Seaport are constantly affected by the Baltic Sea environment (humidity, temperature changes, freezing and thawing effects, etc.). Hydrotechnical concrete is negatively affected by the Baltic Sea water, consisting of certain amounts of salts, highly repetitive moistening and drying (sorption and desorption) processes. Hydrotechnical concrete is characterized by capillary porosity, which is typical of Klaipeda Seaport hydrotechnical structures -quays, because they constantly rise in sea water at different levels of the surface. The aim of the study was to determine the influence of mineral additives on the type of gum, regulating sorbent parameters. The experimental results obtained will provide an opportunity to predict the durability of hydraulic concrete according to its sorption characteristics and damage to corrosion.

-Hydraulic concrete is a composite material that consists of coarse and fine aggregates and a binder, which transforms from liquid to solid state while curing and is exposed to destructive impacts during exploitation. The research was carried out with various cements -Portland cement, slag Portland cement, slag cement and limestone. The results of research showed that quantity of slag in hardened Portland cement paste influences freezing-thawing of concrete for hydraulic structures. Hydraulic concrete under impact of the Baltic Sea is influenced by sea water and freezing and thawing cycles. Under the mentioned impacts exerted simultaneously, experiment results enable assessment of durability of hydraulic concrete. The objective of the work is to assess the impact of the environment of the Baltic Sea on changes in properties of hydraulic concrete after cyclic freezing and thawing.

Abstract. Hydrotechnical constructions in Klaipeda Seaport are constantly affected by the Baltic Sea environment (humidity, temperature changes, freezing and thawing effects, etc.). Hydrotechnical concrete is negatively affected by the Baltic Sea water, consisting of certain amounts of salts, highly repetitive moistening and drying (sorption and desorption) processes. Hydrotechnical concrete is characterized by capillary porosity, which is typical of Klaipeda Seaport hydrotechnical structures -quays, because they constantly rise in sea water at different levels of the surface. The aim of the study was to determine the influence of mineral additives on the type of gum, regulating sorbent parameters. The experimental results obtained will provide an opportunity to predict the durability of hydraulic concrete according to its sorption characteristics and damage to corrosion.