CC BY
15WORKING JOINTS OF MONOLITHIC AND PREFABRICATED STRUCTURES AND METHODS OF OVERCOMING THEIR NEGATIVE
CONSEQUENCES
Bakhromjon Adhamovich Nu'monjon Nabijonovich Risolatkhon Gayratjon Otakulov Abduganiyev qizi Madaminova
Fergana Polytechnic Institute
ABSTRACT
The use of monolithic structures gives buildings and structures an architectural charm and a luxurious look.
Key words: monolithic concrete, architectural appeal, concreting process
The use of new and improved types of concrete and reinforced concrete structures, the quality repair of expired structures on the basis of scientific and technical achievements are among the main priorities in the construction of infrastructure facilities of the Republic.
At present, great attention is paid to monolithic concrete structures in housing and capital construction. The use of monolithic structures gives buildings and structures an architectural charm and a luxurious look.
However, a specific disadvantage of monolithic concrete and reinforced concrete structures is the working joints in them. They are the weakest element, determining the strength, durability and reliability of the structures.
The working seam is the layer formed at the boundaries of the joints of the pre-
Figure 1. Working seams
It occurs when new concrete is laid on top of a previously hardened concrete layer. The tensile strength of new concrete with old concrete is much lower than that of monolithic concrete - 25-30%. At the same time, working joints differ from solid concrete not only in terms of strength, but also in other parameters related to the porous structure - water permeability, frost resistance and other properties. In addition, poorly executed working seams spoil the structure, and in some cases the appearance of the building facade.
Numerous scientific studies have been conducted on the study of working joints and the creation of effective methods of technological solutions that allow the old and new concrete layers to work together in it. However, the analysis of the published literature showed that this issue has not been fully studied, and the opinions and conclusions expressed in them contradict each other. In particular, some literature suggests that the properties of concrete layers in working joints depend on the properties of the cement used in the old concrete, as well as the ambient temperature, that the new concrete layer should be laid before the start of the previous concrete blowing period.
REFERENCES
1. Khomidjonovich, K. B. (2021). Lock Paint Materials. International Journal of Discoveries and Innovations in Applied Sciences, 1(5), 98-99.
2. Бахромов, М. М., Отакулов, Б. А., & Рахимов, Э. Х. У. (2019). Определение сил негативного трения при оттаивании околосвайного грунта. European science,
(1 (43)).
3. Абдукаримов, Б. А., Отакулов, Б. А., Рахмоналиев, С. М. У., & Муродалиева, Н. А. К. (2019). Способы снижения аэродинамического сопротивления калориферов в системе воздушного отопления ткацких производств и вопросы расчета их тепловых характеристик. Достижения науки и образования, (2 (43)).
4. Юсупов, А. Р., Милладжонова, З. Р., Отакулов, Б. А., & Рахимов, Э. Х. У. (2019). К расчёту неравнопрочных термогрунтовых тел на сдвигающие нагрузки. Достижения науки и образования, (2 (43)).
5. Мирзажонов, М. А., & Отакулов, Б. А. (2018). ВЛИЯНИЕ НА ПРОЧНОСТЬ КОНТАКТНОЙ ЗОНЫ РАБОЧЕГО СТЫКА ВРЕМЕНИ ВЫДЕРЖКИ НОВОГО БЕТОНА. In XLIII INTERNATIONAL SCIENTIFIC AND PRACTICAL CONFERENCE" INTERNATIONAL SCIENTIFIC REVIEW OF THE PROBLEMS AND PROSPECTS OF MODERN SCIENCE AND EDUCATION" (pp. 22-24).
6. Мирзажонов, М. А., & Отакулов, Б. А. (2018). Восстановление разрушенных частей бетонных и железобетонных конструкций. Достижения науки и образования, (13 (35)).
7. Xalimjon o'gli, S. J. (2021). INFLUENCE ON DURABILITY OF CONTACT ZONE OF WORKING JOINT TIME OF THE ENDURANCE OF A NEW
CONCRETE. EPRA International Journal of Environmental Economics, Commerce and Educational Management, 8(5), 1-2.
8. Otakulov, B. A., Abdullayev, I. A., & Sultonov, K. S. O. (2021). RAW MATERIAL BASE OF CONSTRUCTION MATERIALS AND USE OF INDUSTRIAL WASTE. Scientific progress, 2(6), 1609-1612.
9. Tulaganov, A., Hodjaev, S., Sultanov, A., Tulaganov, B., Otakulov, B., Hodjaev, N., & Abdasov, D. (2021). FESTIGKEITSBESCHREIBUNG DES SCHWERBETONS AUF ALKALISCHLACKEN-BINDEMITTEL. The Scientific-Practice Journal of Architecture, Construction and Design, 1(1), 5.
10. Abobakirovich, A. B., Adhamovich, O. B., Ugli, M. B. I., & Qizi, M. N. A. (2019). Increasing the efficiency of solar air heaters in free convection conditions. Достижения науки и образования, (2 (43)).
11. Abdukarimov, B. А., Otakulov, B. А., Mahsitaliyev, B. I., & Murodaliyeva, N. А. (2019). INCREASING THE EFFICIENCY OF SOLAR AIR HEATERS IN FREE CONVECTION CONDITIONS. Достижения науки и образования, (2), 26-27.
12. Otakulov, B. A., Karimova, M. I. Q., & Abdullayev, I. A. (2021). USE OF MINERAL WOOL AND ITS PRODUCTS IN THE CONSTRUCTION OF BUILDINGS AND STRUCTURES. Scientific progress, 2(6), 1880-1882.
13. Otakulov, B. A., Abdullayev, I. A., & Toshpulatov, J. O. O. (2021). IMPORTANCE OF HEAT-RESISTANT CONCRETE IN CONSTRUCTION. Scientific progress, 2(6), 1613-1616.
14. Solijon o'g'li, S. H. (2021). ANALYSIS OF COMPOSITIVE ARMATURES. EPRA International Journal of Multidisciplinary Research, 7(5), 494496.
15. Adhamovich, O. B., & Saydi-axmadovich, Y. B. J. EFFECT OF POLYMERY MONOMORES ON THE STRENGTH OF OLD AND CONCRETE CONCRETES.
16. Otakulov, B. A., Isoyev, Y. A., & Salimjonov, J. H. O. G. L. (2021). ABOUT MONOLITHIC REINFORCED CONCRETE STRUCTURES IN CONSTRUCTION. Scientific progress, 2(7), 722-724.
17. Otakulov, B. A., Isoyev, Y. A., & Salimjonov, J. H. O. G. L. (2021). THE SCIENCE OF BUILDING MATERIALS TAKES PLACE IN ARCHITECTURE. Scientific progress, 2(7), 725-727.
18. Otakulov, B. A., Isoyev, Y. A., & Salimjonov, J. H. O. G. L. (2021). WAYS TO SAVE CERAMICS AND FIRE BUILDING MATERIALS. Scientific progress, 2(7), 718-721.
19. Otakulov, B. A., Isoyev, Y. A., & Sailimjonov, J. X. O. G. L. (2021). IMPROVING THE EARTHQUAKE RESISTANCE AND HEAT RESISTANCE OF BUILDINGS BUILT OF MODERN ENERGY-SAVING MATERIALS. Scientific progress, 2(7), 117-120.
20. Xalikova, I. (2021, March). THE ESTABLISHMENT AND DEVELOPMENT OF JADID NEW METHOD SCHOOLS IN FERGHANA VALLEY. In Конференции.
21. SOBIROVA, D., & MILLADJONOVA, Z. Determination of the Bearing Capacity of Flexible Reinforced Concrete Beams of Rectangular Section with a One-sided Compression Flange on the Boundary Conditions of Concrete and Reinforcement. International Journal of Innovations in Engineering Research and Technology, 7(12), 122-124.
22. Kuzibaevich, M. B., & Nabijonovich, A. N. M. (2021). ANALYSIS OF STUDY OF PHYSICAL AND MECHANICAL PROPERTIES OF VERMICULITE CONCRETE WITH NEW GENERATION COMPLEX CHEMICAL ADDITION KDj-3. International Engineering Journal For Research & Development, 6(3), 5-5.
23. Эргашев, С. Ф., Нигматов, У. Ж., Абдуганиев, Н. Н., & Юнусов, Б. С. А. (2018). Солнечные параболоцилиндрические электростанции-cовременное состояние работ и перспективы использования их в народном хозяйстве Узбекистана. Достижения науки и образования, (5 (27)).
24. Абдуганиев, Н. Н., Мирзаева, Г. С., & Абдуганиев, Н. Н. (2019). Пути интенсивности работы аэратенков с пневматической аэрацией. Universum: технические науки, (12-1 (69)).
25. Kozibaevich, M. B. (2021). STUDY OF THE EFFECT OF NEW SYNTHESED COMPLEX CHEMICAL ADDITIONS ON RHEOLOGICAL PROPERTIES OF PORTLAND CEMENT. Innovative Technologica: Methodical Research Journal, 2(12), 133-137.
