Abstract
Power transmission lines (PTL) are strategic objects, the reliability of which depends on the life support of the country. Most of the currently operated power transmission lines were put into operation in the twentieth century, and by now there is a problem of assessing their technical condition, repairing them, if necessary, and maintaining them in a working condition. Defects that appear during the operation of reinforced concrete elements of power transmission lines have different localization and degree of manifestation, but typical is the destruction of the surface layer of concrete with exposure of rebar, more often at the base of the power transmission line. The aim of the work is to select the optimal composition of the repair mixture based on non-shrinking and expanding cements, ensuring reliable adhesion of the repair compounds to the concrete of the structure, which will restore the bearing and operational characteristics in the repaired reinforced concrete elements of the power transmission line at the design level.
Highlights
The considerable experience accumulated at present in the operation of power transmission lines both in our country and around the world makes it possible to judge the practical operational reliability of all elements of power transmission lines
Most of the currently operated Power transmission lines (PTL) were put into operation in the twentieth century, and over the past few decades, the deterioration of high voltage power grids, according to most experts, has increased to 40%
The search for new solutions for the effective restoration of the technical condition of PTL and the problem of timely diagnosis of damage are the urgent tasks of the modern electric power industry [2, 3]
Summary
The considerable experience accumulated at present in the operation of power transmission lines (hereinafter referred to as PTL) both in our country and around the world makes it possible to judge the practical operational reliability of all elements of power transmission lines. Known measures to restore the operational reliability of reinforced concrete elements of PTL in most cases require significant costs of materials and special repair compositions. To prevent a decrease in the strength properties and water resistance of the resulting expanding composite, in addition to aluminum powder, chemical additives are introduced into the mixture These additives include calcium chloride, sulphate aluminate and a surfactant sulphite-alcoholic mash SSB (currently not produced by the pulp and paper industry). The SSB plasticizer has already been discontinued
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