Life time of Reinforced Concrete floors of industrial buildings, connected with the use of chlorine

Moscow State University of Civil Engineering, 26, Yaroslavskoye shosse, Moscow, 129337, Russia

¹ Corresponding author: tamrazian@mail.ru

Abstract

The article deals with the issues of durability (Life time) of floors of industrial buildings associated with the presence of chlorine. It is shown that, together with carbon dioxide, chlorine forms well-soluble hygroscopic layers in the form of calcium chloride. The movement of chlorine salts causes corrosion of the reinforcement and penetrates deep into the concrete. Therefore, the service life of reinforced concrete elements when exposed to an external aggressive environment is reduced due to corrosion of reinforcement and concrete. Experimental data and analytical dependences of the advance of the front of chloride concentrations dangerous for reinforcement and destruction of concrete under the action of the considered aggressive environment are presented. A formula is derived for the design service life of reinforced concrete structures by the factor of the passivating action of the protective layer of concrete. An empirical dependence of the service life of the structure on the depth of corrosion (diameter reduction) of the reinforcement was also obtained. The coefficient of corrosive wear of reinforcement for rectangular and tee sections bending reinforced concrete elements is calculated.