Assessment of concrete strength development in winter

International Conference on Construction, Architecture and Technosphere Safety 2018

土木建筑工程

Pikus, G.A.^1 ; Brzhanov, R.T.^2

Department of Building Construction and Structural Theory, South Ural State University, Lenin Ave., 76, Chelyabinsk

454080, Russia^1

Department of Building, Caspian State University of Technology and Engineering Named after Sh. Esenov, 32 Microdistrict, Aktau

130003, Kazakhstan^2

关键词: Arrhenius equation;    Classical equation;    Concrete temperatures;    Physical approaches;    Strength development;    Strength of concrete;    Temperature chamber;    Temperature dependence;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/451/1/012075/pdf
DOI  :  10.1088/1757-899X/451/1/012075

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

The study attempts to demonstrate that it is possible to apply classical equations of chemical reactions for assessing the strength of concrete, cured in winter. This assumption differs from the existing classical theories of strength development in concrete, based on physical approaches. The graphs of the known normal temperature dependences of the chemical reaction rate and the increase in substance concentration in time allowed us to confirm the possibility for further research of strength development in concrete from the standpoint of chemical theories. For these purposes, the Van't Hoff and Arrhenius equations were considered. To compare the results of theoretical studies with real constructions, we conducted an extensive experiment that involved a testing machine and a temperature chamber to assess the actual development of concrete strength in time at different temperatures (5, 20, 40, and 60°C). The temperature graphs of hardening of B40 concrete were plotted. Both equations showed identical results in calculating the increase in the reaction rate with the increase in concrete temperature. The research results allowed us to conclude that classical chemical theories used to assess the dependence of the reaction rate on temperature can be applied for calculating the concrete strength in winter.