IMPACT OF CONCRETE QUALITY WORKS ON CONCRETE STRENGTH OF MONOLITHIC CONSTRUCTIONS

https://doi.org/10.34031/2618-7183-2018-1-1-51-58
The production of concrete works in the construction of monolithic frames of buildings and structures is associated with a large number of technological operations and the corresponding dependence of the quality of the products obtained from the culture of construction production and the level of its control. In many cases, concreting is carried out with some deviations from the technical regulations governing the preparation and laying of the concrete mix, which has a negative impact on the consumer characteristics of the structure, first of all, on strength. It is known that the most common methods of industrial control of the quality of concrete work are destructive tests of concrete samples laid in control cubes together with the constructed structure and non-destructive testing of concrete of the strength that has gained strength. However, even qualitatively and timely carried out control measures do not guarantee the achievement of design-controlled design strength throughout the volume, since control cubes are prepared for testing under ideal conditions of laying and concrete set of strength not observed in the design, and non-destructive methods determine the strength of near-surface layers of concrete, which allows judging reliably the strength of the material throughout the volume of the structure. Especially these circumstances relate to the most massive and, at the same time, the most important for the structural safety of the whole building frame structures – monolithic foundation slabs. The difference between the actual strength of the slabs extracted from the slab during the production of the construction and technical expertise of concrete cores depends significantly on the depth of core extraction, while the design of the slab is always carried out on the as-sumption of an equal strength of the concrete along the depth of the structure, which is obviously the source of the potential limited availability of foundation plates and the cause of the appearance of numerous defects in the construction and operation of structures of the above-foundation part of the frame. The paper presents experimental studies of the authors to determine the actual difference in concrete strength from the depth of foundation slabs and quantifies it.
1. Sulimenko Lev. Tehnologija mineral'nyh vjazhushhih materialov i izdelij na ih osnove. M.: Vysshaja shkola, 2005. 334 p. (rus)
2. Osnovin V.N., Shuljakov L.V., Dubjago D.S. Spravochnik po stroitel'nym materialam i izdelijam. 3 izd. M.: Feniks. 111 p. (rus)
3. Metodika ocenki i sertifikacii inzhenernoj bezopasnosti zdanij i sooruzhenij FC VNII GOChS. M.: 2003. 85 p. (rus)
4. Russian Building Code SP 13-102-2003. Pravila obsledovanija nesushhih stroitel'nyh konstrukcij zdanij i sooruzhenij. M.: FGUP «KTB ZhB», 2003. vved. 21.08.2003 g. (rus)
5. Russian State Standart GOST 22690-88 Betony. Opredelenie prochnosti mehanicheskimi metodami ne-razrushajushhego kontrolja. (rus)
6. Russian State Standart GOST 10180-2012 «Betony. Metody opredelenija prochnosti po kontrol'nym obrazcam». (rus)
7. Unezheva V.A., Abakumov R.G. Nakoplenie fizicheskogo iznosa zhilogo fonda v techenie zhiznennogo cikla. Tendencii razvitija stroitel'stva, teplogazosnabzhenija i jenergoobespechenija. Materialy mezhdunarodnoj nauchno-prakticheskoj konferencii. Pod red. F.K. Abdrazakova; kafedra «Stroitel'stvo i teplogazosnabzhenie», FGBOU VO Saratovskij GAU im. N.I. Vavilova. 2016. P. 250 – 254. (rus)
8. Avilova I.P., Naumov A.E. Osnovy organizacii i upravlenija v stroitel'stve. Belgorodskij gosudarstvennyj tehnologicheskij un-t im. V. G. Shuhova. Belgorod, 2011. (rus)
9. Zharikov I.S. Kompleksnaja rekonstrukcija zdanij, sostojanie i perspektivy. Sbornik nauchnyh trudov Sworld. 2014. 26 (4). S. 3 – 6. (rus)
10. Falikman V.R. The 3-rd All-Russian Conference on Concrete and Reinforced Concrete. Moscow State University Of Civil Engineering, Russia, Moscow, 2014.
11. Zharikov I.S., Markova A.A., Volobueva Ju.I. Nerazrushajushhij i razrushajushhij metody opredelenija fiziko-mehanicheskih svojstv stroitel'nyh materialov, ih dostoinstva i nedostatki. Vestnik nauchnyh konferencij. 2016. 1-1 (5). P. 40 – 43. (rus)
12. Zharikov I.S. Sovershenstvovanie sistemy ocenki potenciala rekonstrukcii zdanij i sooruzhenij. Jekonomika i upravlenie: analiz tendencij i perspektiv razvitija. 2014. 15. P. 121 – 125. (rus)
13. Zharikov I.S., Skrypnik O.G. K voprosu o neobhodimosti sovershenstvovanija processa i posledovatel'nosti rekonstrukcii. Strategija ustojchivogo razvitija regionov Rossii. 2014. 22. P. 24 – 27. (rus)
14. Zharikov I.S. Metodologicheskij podhod k uchetu tehnicheskogo sostojanija ob#ektov nedvizhimosti pri opredelenii ih stoimostnyh harakteristik. Intellektual'nyj potencial XXI veka: stupeni poznanija. 2014. 22. P. 100 – 104. (rus)
15. Zharikov I.S. K voprosu o neobhodimosti sovershenstvovanija metodiki ocenki ob#ektov nedvizhimosti s uchetom tehnicheskogo sostojanija zdanij (sooruzhenij). Strategija ustojchivogo razvitija regionov Rossii. 2014. 21. P. 26 – 30. (rus)
16. Grabovy P.G., Naumov A.E., Avilova I.P. Scientific aspects of productivity management in the investment and construction sector. International Business Management. 2016. 10 (7). P. 1354 – 1364.
17. Zagorodnjuk L.H., Lesovik V.S., Volodchenko A.A., Yerofeyev V.T. Optimization of mixing process for heat-insulating mixtures in a spiral blade mixer. International Journal of Pharmacy and Technology. 2016. 5. S. 15146 – 15155.
18. Volodchenko A.A., Lesovik V.S., Zagorodnjuk L.H., Volodchenko A.N., Aleksandrova K.A. The control of building composite structure formation through the use of multifunctional modifiers. Research Journal of Applied Sciences. 2016. 6. P. 931 – 936.
19. Zagorodnjuk, L.H., Lesovik, V.S., Volodchenko, A.A. To the question of dry mortars components mixed in various mixing units. International Journal of Applied Engineering Research. 2015. 3. P. 44844 – 44847.
20. Merkulov S.I., Lesovik R.V., Klyuev S., Kalashnikov N. Strength and deformability of reinforced concrete structures in service. World Applied Sciences Journal. 2013. 25. P. 1747 – 1750.
21. Lesovik R.V., Strokova V.V., Vorsina M.S. Development of compacted concrete using the technogeneous raw materials for road construction. Stroitel'nye Materialy. 2014. 9. P. 8 – 9. (rus)
22. Gridchin A.M., Sevost'yanov V.S., Lesovik V.S., Sevost'yanov M.V., Perelygin, D.N. Technological complex for manufacturing the activated composite mixtures and formed materials. Stroitel'nye Materialy. 2004. 9. P. 34 – 37.
Zharikov I.S., Laketich A., Laketich N. Impact of concrete quality works on concrete strength of monolithic constructions. Construction Materials and Products. 2018. 1 (1). P. 51 – 58. https://doi.org/10.34031/2618-7183-2018-1-1-51-58