Modeling of Shrinkage Deformations of High-Strength Self-Compacting Light Concretes on Porous Fillers

High-strength lightweight concretes of the new generation, manufactured on the basis of self-sealing modified cement systems using lightweight porous natural and artificial aggregates, represent a promising building material, the introduction of which into the practice of designing and erecting monolithic reinforced concrete structures will reduce the own weight of the load-bearing elements while maintaining strength characteristics at the class B60 level and higher. At the same time, the widespread use of these concretes in construction is hindered by the fact that the current regulatory documentation provides physico-mechanical and rheological characteristics for lightweight concretes of a compressive strength class not higher than B40. This determines the relevance of conducting comprehensive experimental and theoretical studies of the properties of high-strength lightweight modified concretes under short-term and long-term impacts, followed by inclusion in design standards. This article examines the complex of physico-mechanical properties of three optimized compositions of concrete mixtures prepared, respectively, on the basis of quartz sand and expanded clay gravel, expanded clay sand and gravel, and tuff sand and tuff crushed stone. For concrete mixtures obtained on the basis of these data, the development of shrinkage deformations was studied depending on the duration of observation. The influence of the type and dosage of coarse and fine aggregate on the magnitude and nature of the development of shrinkage deformations is shown. Based on the methodology of I.E. Prokopovich and M.M. Zastava has developed a method for theoretically modeling the development of relative shrinkage deformations of the studied concretes over time.

S.S. KAPRIELOV^1,2, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
N.I. KARPENKO³, Doctor of Sciences (Engineering), Professor (This email address is being protected from spambots. You need JavaScript enabled to view it.);
A.V. SHEYNFELD^1,2, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
G.A. MOISEENKO^3,4, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
N.M. SELYUTIN^1,5, Engineer (This email address is being protected from spambots. You need JavaScript enabled to view it.);
I.M. BEZGODOV², Engineer (This email address is being protected from spambots. You need JavaScript enabled to view it.)

¹ Research Institute of Concrete and Reinforced Concrete named after A.A. Gvozdev, JSC Research Center of Construction (NIIZHB) (6, 2nd Institutskaya Street, Moscow, 109428, Russian Federation)
² National Research Moscow State University of Civil Engineering, (26, Yaroslavskoe Highway, Moscow, 129337, Russian Federation)
³ Scientific-Research Institute of Building Physics of the Russian Academy Architecture and Construction Sciences (21, Lokomotivniy Driveway, Moscow, 127238, Russian Federation)
⁴ Moscow Polytechnic University ( 38, Bolshaya Semyonovskaya Street, Moscow, 107023, Russian Federation)5 OOO “Enterprise Master Concrete” (31, Saratovskaya Street, Moscow, 109518, Russian Federation)

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