Report of the Postgraduate student of KhNUCEA, Director of UABIM Vladimir Kuchugura (Volodymyr Kuchuhura) at the ІV international conference "Operation and reconstruction of buildings and structures".

Ministry of Education and Science of Ukraine
Odessa State Academy of Civil Engineering and Architecture
Odessa City Council
SE "State Research Institute of Building Constructions"
Academy of Civil Engineering of Ukraine
University North (Croatia)

Date: 10 September 2021
Location: Odessa State Academy of Civil Engineering and Architecture

ISBN 978-617-7900-44-2
Today, the problem of improving the quality and service life of industrial and civil floors is especially urgent. In most cases, the floors are in unsatisfactory condition, despite the wide variety of building materials and device technologies. The main defects and damage: unacceptable vertical deformations, the presence of through and surface cracks, peeling of the concrete layer surfaces, the appearance of potholes, surface unevenness, destruction of temperature-shrinkage expansion joints, the appearance of the curvature effect. A number of reasons have been identified:

1. Lack of modern building codes for the design, installation and repair of high-strength floors. The consequence of this is the use of structures, the choice of materials and technologies without proper engineering regulatory support. At the same time, the main decision-making criteria are the experience of the contractor's experience and the customer's price restrictions;

2. Insufficient or complete lack of attention to the problem of assessing the properties of the concrete base and the discrepancy between the actual operating loads in accordance with the engineering calculations of the bearing capacity of the structure. At the same time, there is excessive attention and emphasis on the materials of the "finishing" layer of the floor covering and the technologies of its construction;

3. Poor quality concrete and insufficient control over it at the construction site. The test results of concrete samples confirm the discrepancy between the actual and declared strength values;

4. Appointment of compressive strength as the main strength characteristic of concrete, although it is known that for floor structures this indicator is of secondary importance, the main indicator is axial tensile and flexural tensile strength;

5. Unreasonable choice of materials used to strengthen the surface layer of concrete, not taking into account the quantitative values ​​of floor abrasive loads. The lack of a unified methodology for assessing the abrasion indicators of a concrete surface does not allow for an objective comparison and selection of the necessary material for the given operational loads;

6. Failure to comply with the technology of work performance;

7. Impact of loads exceeding the calculated ones or even specified standard ones.
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