Effect of relative air humidity on the creep coefficient of high-strength self-compacting concrete

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Abstract

Comparative long-term tests of high-strength self-compacting concretes of classes B70, B80, and B100 with the organomineral modifier MB10-50C were conducted to evaluate the effect of relative air humidity (20, 60, 90%) on their deformation and strength properties. The studies were carried out in accordance with GOST 24452–2023 and GOST 24544–2020. It was found that a decrease in relative air humidity from 90% to 20% slows down but does not stop the hardening processes of high-strength concretes from 28 to 268 days. This is explained by the specific structure of the cement paste, which can more effectively accommodate changes in relative air humidity. At the same time, the increase in compressive strength and elastic modulus of concretes of classes B70–B100 decreases from 7–12% to 4–5%. The experimentally obtained creep coefficients of high-strength self-compacting concretes of classes B70–B100, which determine the value of the concrete deformation modulus under prolonged load, fall within a narrow range at the same air humidity (0.32–0.38 at 90%, 0.41–0.50 at 60%, and 0.61–0.71 at 20%). These values are significantly lower-by a factor of 2 or more than the standardized values according to Eurocode EN 12390 (ranging from 0.71 to 1.41) and the set of rules SP 63.13330.2018 (ranging from 1.0 to 2.0).

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About the authors

S. S. Kaprielov

Research Institute of Concrete and Reinforced Concrete (NIIZHB) named after A.A. Gvozdev; National Research Moscow State University of Civil Engineering

Author for correspondence.
Email: kaprielov@masterbeton-mb.ru

Doctor of Sciences (Engineering)

Russian Federation, 6, 2-nd Institutskaya Street, Moscow, 109428; 26, Yaroslavskoe Highway, Moscow, 129337

P. D. Arleninov

Research Institute of Concrete and Reinforced Concrete (NIIZHB) named after A.A. Gvozdev; National Research Moscow State University of Civil Engineering

Email: arleninoff@gmail.com

Candidate of Sciences (Engineering)

Russian Federation, 6, 2-nd Institutskaya Street, Moscow, 109428; 26, Yaroslavskoe Highway, Moscow, 129337

A. V. Sheynfeld

Research Institute of Concrete and Reinforced Concrete (NIIZHB) named after A.A. Gvozdev; National Research Moscow State University of Civil Engineering

Email: sheynfeld@masterbeton-mb.ru

Doctor of Sciences (Engineering)

Russian Federation, 6, 2-nd Institutskaya Street, Moscow, 109428; 26, Yaroslavskoe Highway, Moscow, 129337

P. S. Kalmakova

Research Institute of Concrete and Reinforced Concrete (NIIZHB) named after A.A. Gvozdev; National Research Moscow State University of Civil Engineering

Email: polina15kalmakowa@gmail.com

Research Associate

Russian Federation, 6, 2-nd Institutskaya Street, Moscow, 109428; 26, Yaroslavskoe Highway, Moscow, 129337

References

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Supplementary files

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2. Fig. 1. Test climatic chambers with spring installations (relative air humidity in the chamber: a – 20±5%; b – 60±5%; c – 90±5%)

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3. Fig. 2. The influence of relative humidity of the ambient air on moisture loss (a) and water content (b) of high-strength concrete at the age of 268 days

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4. Fig. 3. Effect of relative humidity of the environment on the prismatic strength (a) and initial modulus of elasticity (b) of high-strength concrete at the age of 268 days

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5. Fig. 4. Relative shrinkage deformations of high-strength concrete class B100 in the period from 28 to 268 days at different relative humidity of the ambient air: 1 – humidity 20%; 2 – humidity 60%; 3 – humidity 90%

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6. Fig. 5. Relative creep deformations of high-strength concrete class B100 in the period from 28 to 268 days at different relative humidity of the ambient air: 1 – humidity 20%; 2 – humidity 60%; 3 – humidity 90%

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7. Fig. 6. Experimental values of creep coefficients of high-strength concrete classes B70, B80 and B100 at different relative humidity of the ambient air in comparison with their standard values according to SP 63.13330.2018 and Eurocode EN 12390

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