Longevity of Concrete Maritime Structures in Harsh Service Environment

Abstract

This paper is devoted to the problems of longevity of concrete maritime structures in climatic conditions of Russian Far Eastern seas. The subject actuality is stipulated with the plans of building of hydroengineering and transport structures in harsh climatic conditions under the program of modernization and expansion of the seaports capability in the Far East and development of the Northern Sea Route. It analyses the experience of hydroengineering structures building in conditions of Sakhalin Island seacoast during the period from 1920 to 2019 years. Character types of maritime hydroengineering structures by longevity considering service environment in corrosive mediums with the XF4 index are allotted and described. It mainly focuses to estimating of longevity by the results of predictive freezing-tests. Concrete’s qualitative reliabilities, deciding longevity of structures in hard service environment are analyzed. The data on actual frost-resistance of base (reference) composition concrete, which quality indexes have to ensure longevity at least 50 years in harsh climatic conditions, are cited. It is noted, that during the exploitation period increasing of qualitative indices of concrete is possible due to hardening and stabilization of concrete’s structure. It has been ascertained, that within the exploitation period concrete’s qualitative indices may increase due to its structure hardening and stabilization. It suggests the line of further investigations for methods preparation to predict structures service lifetime in hard service environment on the basis of the frost-resistance index of concrete and accumulation of experimental data on structures behavior in aggressive and harsh conditions.