Author(s): Alexey A. Sklyarov; Tatiana E. Uvarova; Galina S. Slavcheva; Egor E. Pomnikov
Linked Author(s):
Keywords: Hardmetry; Abrasion; Concrete; Hydrotechnical constructions; Estimation method
Abstract: The main factor affecting the reliability of marine ice-resistant platforms (MIRP) is the ice regime in the construction site and, as a result, ice loads and impacts on the structure. One of such impacts in the water areas with a dynamic regime of ice cover drift is ice abrasion. The concrete in the variable-level zone from the drifting ice cover effect contributes to the loss of the structure concrete elements thickness in the variable level zone, causes the danger of reinforcement exposure and its accelerated corrosion in the marine environment and, therefore, may lead to a reduction in the strength characteristics of these structural elements. The task of increasing the concrete resistance to the ice cover abrading impacts is directly related to the studies of their deterioration resistance and the requirements determination for the composition and concretes exploited structure in the Arctic seas. The article substantiates the prerequisites of the hardmetry use for the concrete resistance evaluation to ice abrasion as a method of obtaining an independent direct quantitative resistance index that is correlated with the concrete destruction processes during ice abrasion and independent of the ice impacts parameters. The applying possibilities and adapting existing hardmetry methods testing for concrete as a brittle heterogeneous material have been estimated. The rationale for the optimal method, procedure and algorithm for estimating the concrete hardness is discussed, and the tests results of specimens that prove the determining possibility the integral concrete hardness based on a statistically reliable hardness evaluation of each of its structural elements are presented. To predict and regulate the concrete resistance to ice abrasion, it is proposed to identify the relationship between the integral hardness index of the concrete surface and the found depth values of ice abrasion, considering the variation in speed, temperature and ice pressure, performed in the period from 2007 to 2014 on a special unit for studying ice abrasion effects on various types of building materials.
Year: 2018