Dependence of energy consumption in terms of 1 m 3 of concrete when using cements of different specific surface

Abstract

Objective. The aim of the study is to find rational ways to change the total energy consumption spent on cement production in terms of 1 m3 of concrete.Method. To obtain reliable data, experimental and laboratory methods for testing cement were used.Result. Tests have shown that at constant concrete strength, the consumption of cement per 1 m3 of concrete decreases with an increase in the specific surface of the binder, especially significantly in the case of Portland slag cement. The calculation results show that with an increase in the specific surface area of cements, the total energy consumption for their production, referred to 1 m3 of concrete of the same strength, decreases, and most significantly with an increase in the specific surface area of cements from 300 to 400 m2 /kg and less from 400 to 500 m2 /kg.Conclusion. To reduce the energy intensity of concrete, it is necessary to use cements ground much thinner than they are ground at cement plants in open-type mills, despite the increase in energy consumption. Cements with high fineness of grinding can reduce the cycle of heat and moisture treatment of concrete products. Reducing the cycle allows to increase the turnover of molds and labor productivity at precast concrete plants, as well as further reduce energy consumption for the production of prefabricated reinforced concrete structures.

Keywords

• finely ground cements
• increase in fineness of grinding
• portland slag cement,
• granulated slag
• increase in the specific surface of the binder
• specific energy consumption