Autogenous shrinkage of cement and concrete with superplasticizers of various chemical bases

https://doi.org/10.58224/2618-7183-2026-9-2-5
Introduction. The stress-strain state of massive monolithic reinforced concrete structures during the early stages can cause cracks due to temperature deformation and autogenous shrinkage of concrete. Ignoring the deformations caused by autogenous shrinkage in calculations of the stress-strain state is often an unjustified simplification. This emphasizes the importance of studying the influence of formulations and technological factors on the amount and rate of autogenous shrinkage in concretes. The kinetics of autogenous shrinkage, especially during the first two days of hardening, can vary significantly depending on the specific characteristics of the cement and superplasticizer used. The aim of the study. To investigate the influence of the type of cement and superplasticizers with different chemical basis on the magnitude and kinetics of autogenous shrinkage and to obtain the necessary equations for calculations of thermally stressed states in the early stages. Methods. Analysis of existing approaches to assessing autogenous shrinkage in cement paste and concrete. Experimental study of autogenous shrinkage of cement pastes. Comparison results with published data and EN and JSCE standards. Results. Based on the proposed equation a classification of autogenous shrinkage kinetic of cements is proposed. The kinetics of autogenous shrinkage was varied: at the age of one day, the amount of autogenous shrinkage relative to seven days can vary up to six times, at the age of three days up to two times. An equation of the dependence of autogenous shrinkage on concrete strength is proposed for calculating the thermally stressed state of massive monolithic structures in the early period.
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Chepurnenko A.S., Nesvetaev G.V., Koryanova Yu.I. Autogenous shrinkage of cement and concrete with superplasticizers of various chemical bases. Construction Materials and Products. 2026. 9 (2). 5. https://doi.org/10.58224/2618-7183-2026-9-2-5