Methods for restoring the mobility of a concrete mix

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The relevance of the study is due to the fact that currently monolithic construction is characterized by a high rate of construction work, since in modern market conditions this indicator determines the final cost per square meter. As it is known, the life cycle of any concrete product or structure includes the preparation of a concrete mixture, transportation, laying, sealing, hardening and further operation.Therefore, the initial stage of the life cycle – the preservation of the properties of the concrete mixture over time will determine the technological and physico-mechanical properties, respectively, of the concrete mixture and concrete. An aggravating factor in maintaining the properties of the concrete mixture in the summer is the air temperature exceeding 30оC. The paper shows technological techniques that make it possible to level the temperature factor on the properties of the concrete mixture over time.It was found that the introduction of superplasticizers in the amount of 1% of the cement mass and the restoration of mobility at the construction site make it possible to obtain concretes with specified qualities. This study is relevant for manufacturers of concrete mixtures.

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作者简介

N. Krasinikova

“Kazan DSK” LLC

编辑信件的主要联系方式.
Email: knm0104@mail.ru

Candidate of Sciences (Engineering), Deputy Director for Quality Chief Technologist 

俄罗斯联邦, 118, bldg. 2, Adelya Kutuya Street, 420087, Kazan

R. Sagdeev

“Kazan DSK” LLC

Email: RSagdiev2@abdev.ru

Candidate of Sciences (Engineering), Head of Laboratory 

俄罗斯联邦, 118, bldg. 2, Adelya Kutuya Street, 420087, Kazan

R. Kashapov

“Kazan DSK” LLC

Email: RKashapov3@abdev.ru

Candidate of Sciences (Engineering), Head of Quality Control 

俄罗斯联邦, 118, bldg. 2, Adelya Kutuya Street, 420087, Kazan

A. Fakhrutdinov

“Kazan DSK” LLC

Email: knm0104@mail.ru

Master Student, Laboratory Engineer 

俄罗斯联邦, 118, bldg. 2, Adelya Kutuya Street, 420087, Kazan

R. Nekrasov

“Kazan DSK” LLC

Email: knm0104@mail.ru

Bachelor, Laboratory Engineer 

俄罗斯联邦, 118, bldg. 2, Adelya Kutuya Street, 420087, Kazan

参考

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  5. Elrefai A.E.M.M., Pudov I.A., Yakovlev G.I., et al. Combination of additives of different genesis to improve the efficiency of modification of cement concrete. Stroitel’nye Materialy [Construction Materials]. 2017. No. 1–2, pp. 26–30. (In Russian). EDN: XXIHQR
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  9. Zharikov I.S., Laketich A., Laketich N. Influence of the quality of concrete works on the strength of concrete of monolithic structures. Stroitel’nyye materialy i izdeliya. 2018. Vol. 1. No. 1, pp. 51–58. (In Russian). EDN: XUFBUT
  10. Bazhenov Yu.M. Tekhnologiya betona [Concrete technology]. Moscow: ASV. 2007. 528 p.

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2. Fig. 1. Maintaining the mobility of concrete mixture at a temperature of 22–25оС with optimal dosages of superplasticizers: 1 – Линамикс ПК 116.23; 2 – Movecrete RM-40; 3 – РГФ-20; 4 – Tanplast TB-1; 5 – Sika2067.2

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3. Fig. 2. Maintaining the mobility of concrete mixture at a temperature of 38–40оС with optimal dosages of superplasticizers: 1 – Линамикс ПК 116.23; 2 – Movecrete RM-40; 3 – РГФ-20; 4 – Tanplast TB-1; 5 – Sika2067.2

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4. Fig. 4. Kinetics of strength gain at optimal dosages: 1 – control composition (NU, 20оC); 2 – elevated temperature; 3 – restoration of mobility

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5. Fig. 3. Maintaining the mobility of concrete mixture at a temperature of 38–40оС with increased consumption of superplasticizer: 1 – Линамикс ПК 116.23; 2 – Movecrete RM-40; 3 – РГФ-20; 4 – Tanplast TB-1; 5 – Sika2067.2

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6. Fig. 5. Kinetics of strength gain at increased dosages: 1 – control composition (Normal conditions, 20оC); 2 – elevated temperature; 3 – restoration of mobility

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