Forecast durability of concrete protective layer wall panel large residential buildings series 1-480 criterion carbonization

Relevance. Durability is an important property and reliability, which provide the ability to long-term operation at the required maintenance, including various types of repairs. Long-term climate effects are factor that has a significant impact on the current state of superficial and deep layers of fencing and designs. All studies forecast carbonation of concrete protective layer designed for stationary processes, when the temperature and humidity constant. In actual conditions,the temperature and humidity of the outside air change throughout the year. These factors must be considered when assessing and improving the methods of forecasting durability of concrete protective layer on the criterion of carbonation. It is noted that special attention should be vertical and horizontal joints of panels and, above all, their connection to the embedded metal parts, often prone to corrosion. Common to these series common type of damage is the formation of cracks in the joints of exterior wall panels,whereby the connecting elements are destroyed and the permeation of moisture in the flat, the occurrence of moisture, rot and impaired spatial rigidity and stability of buildings. The purpose of this paper is to forecast the durability, protective layer of concrete wall panels of large residential buildings series 1-480 criterion carbonation. Results. Submitted forecast calculations time carbonation of concrete protective layer thickness of 20, 30, 40 mm rebar connections vertical joints of wall panels of large residential buildings 1.480 series for the climatic conditions of Dnepropetrovsk at a rate of portland cement in concrete 250 and 300 kg / m3 and water-cement ratio W/C = 0.5. Scientific novelty and practical significance. The estimation and prediction of the durability of large residential buildings, taking into account the kinetics of corrosion of concrete and reinforcing relationships.