Creep of Foam Concrete from the Position of the Hereditary Theory of Aging

Abstract:

The technique and results of experimental studies of creep deformations of compressed elements made of foam concrete at constant compressive stresses in the 0.15-0.75 range of R_b are presented. The nature of the relationship between stresses and the corresponding deformations, the degree of reversibility of creep deformations during unloading of samples and the tendency of concrete to aging have been established. From the standpoint of the hereditary theory of aging, analytical expressions have been selected to approximate the curves of specific creep deformations depending on the average density of foam concrete and the magnitude of compression stresses. The largest deviations of the specific creep deformations of foam concrete between theoretical and experimental values are 11.4%, and the standard deviations for the entire observation period are 2.0%

• Periodical: Materials Science Forum (Volume 1082)
• Pages: 209-214
• DOI: https://doi.org/10.4028/p-8d7m8q
• Online since: March 2023
• Authors: M.V. Novikov*
• Keywords: Approximation, Creep Deformations, Creep Measure, Foam Concrete, Stresses, Theory

References

[1] N.G. Arutyunyan, A.A. Zevin, Calculation of building structures taking into account creep, Stroyizdat, Moscow, 1988.

[2] M.V. Novikov, G.S. Slavcheva, E.M. Chernyshov, Models of mechanics of structural porous concrete in conditions of long-term load action, in: Mater. VIII Acad. readings of RAASN - Internat. Sci. and Technic. conf., Mechanics of destruction of building materials and structures, KGASU, Kazan, 2014, pp.225-232.

[3] S.B. Krylov, P.D. Arleninov, Modern research in the field of creep theory of concrete, Bulletin NIC Constr. 1(16) (2018) 67-75.

[4] A.R. Rzhanitsyn, Creep Theory, Stroyizdat, Moscow, 1968.

[5] Yu.N. Rabotnov, Creep of Structural Elements, Science, Moscow, 1966.

[6] N.G. Arutyunyan, V.B. Kolmanovsky, Theory of Creep of Inhomogeneous Bodies, Science, Moscow, 1983.

[7] S.V. Aleksandrovsky, Calculation of Concrete and Reinforced Concrete Structures for Changes in Temperature and Humidity, Taking into Account Creep, Stroyizdat, Moscow, 1973.

[8] I.E. Prokopovich, V.A. Zedgenidze, Applied Theory of Creep, Stroyizdat, Moscow,1980.

[9] D.K.S. Bataev, M.A. Gaziev, Kh.N. Mazhiev, Selection of creep theory for evaluation of long-term deformation of fine autoclave cellular concrete taking into account carbonation factor, Bulletin of Dagestan State Technical University. Tech. Sci. 3(38) (2015) 94-103.

DOI: 10.21822/2073-6185-2015-38-3-94-103

[10] K.Z. Galustov, Nonlinear Theory of Concrete Creep and Calculation of Reinforced Concrete Structures, FM, Moscow, 2006.

[11] P.I. Vasiliev, The effect of aging concrete on the appearance of creep curves, Izvestia VNIIG. 57 (1957) 129-134.

[12] E.M. Chernyshov, G.S. Slavcheva, M.V. Novikov, Strength and deformability of porous concrete under short-term and long-term action of loads, in: Col. of Sci. Artic. on the Mater. of the 7th Internat. Sci. Conf., Mechanics of concrete, reinforced concrete and other building materials destruction, RAASN, Voronezh, 2013, pp.167-173.

[13] G.S. Slavcheva, E.M. Chernyshov, M.V. Novikov, New generation heat-efficient foam concrete for low-rise construction, Constr. Mater. 7 (2017) 20-24.

[14] M.V. Novikov, Design indicators of resistance of porous concrete to short-term and long-term power impacts, J. Sci. Eng. Syst. and Struct. 3-4(28-29) (2017) 57-63.

[15] M.V. Novikov, E.M. Chernyshov, G.S. Slavchev, Prochnost of normal sections of the bent elements from porizovanny concrete of natural curing, RAASN Acad. Bulletin UralNIIproekt. 1(44) (2020) 83-88.

[16] M.V. Novikov, E.M. Chernyshov, G.S. Slavcheva, Mechanical properties of cement porous concrete at uniaxial compression with due regard for regularities of its creep, Constr. Mater. 11 (2016) 26-31.

[17] M.V. Novikov, E.E. Prokshits, A.N. Goykalov, Creep and Long-Time Strength of Compression Elements from Foam Concrete, Solid State Phenomena. 284 (2018) 936-943.

DOI: 10.4028/www.scientific.net/ssp.284.936

[18] S.Z. Wulfson, To nonlinear creep theory/C.Z. Wulfson , in: a collection of scientific works, Creep of building materials and structures, Stroyizdat, Moscow, 1964, pp.84-95.

[19] E.N. Lvovsky, Statistical Methods of Constructing Empirical Formulas, Higher School, Moscow, 1988.

[20] V.M. Bondarenko, N.I. Karpenko, Stress level as a factor of structural changes and rheological strength resistance of concrete, Acad. Architect. and Constr. 4 (2007) 56-60.