CEMENT

UDC 691.54:666.94.052.6

[:en]Khozin V. G.[:ru]Хозин В. Г.[:] [:en]Doctor of Engineering Sciences, Professor, Head of the Department of Technology of Building Materials, Products and Structures, Kazan State University of Architecture and Civil Engineering, Kazan, Russia[:ru]доктор техн. наук, профессор, зав. кафедрой технологии строительных материалов, изделий и конструкций, Казанский государственный архитектурно-строительный университет, Казань, Россия[:]

[:en]Khokhryakov O. V.[:ru]Хохряков О. В.[:] [:en]Candidate of Engineering Sciences, Associate Professor of the Department of Technology of Building Materials, Products and Structures, Kazan State University of Architecture and Civil Engineering, Kazan, Russia[:ru]канд. техн. наук, доцент кафедры технологии строительных материалов, изделий и конструкций, Казанский государственный архитектурно-строительный университет, Казань, Россия[:]

[:ru]Харченко И. Я.[:en]Kharchenko, I. Ya.[:] [:ru]д. т. н., Национальный исследовательский Московский государственный строительный университет, г. Москва, Россия[:en]Dr. of Tech. Sc., National Research Moscow State University of Civil Engineering, Moscow, Russian[:]

Alitinform №2 (67) 2022 г. 2-11 p.

Abstract

The environmental situation of the global cement industry, whose share of energy and CO₂ emissions among the five major industrial sectors is 26 %, is assessed. The Cement Sustainability Initiative (CSI) has set as 2050 targets for a scenario of 2 ^⁰C increase in ambient temperature by 2100, 370 kg of CO₂ per tonne of Portland cement. The main way to reduce CO2 emissions is to reduce the cement clinker capacity, while the traditional economically most effective and technically feasible way of its implementation is to replace clinker with mineral additives in the co-milling (hydraulic, pozzolanic, inert). The advantages and disadvantages of this method are given. According to the legislation on environmental protection, all cement producers in Russia must switch to Best Available Techniques (BAT) by the end of 2024. The aim of BAT is to save energy and reduce the negative impact on the environment (BEN).
The extensive potential of low water demand cement (LWDC) technologies produced by co-milling clinker or Portland cement without additives with superplasticizers and mineral substitute fillers is shown. A number of LWDCs have been produced which are superior to industrial cements in terms of technology, strength properties and lower energy consumption for grinding with a clinker content of up to 30 %. The carbon footprint of these binders is 2–3 times lower than that of all known Portland cements and the technology fully meets the BAT criteria for energy conservation and minimum CO₂ emissions. Conversion of the Russian and global cement industry to the best available technology — LWDC production — is the most effective way to achieve the CSI targets of reducing clinker intensity, energy consumption and greenhouse gas emissions by 2050.

Key words:

environmental friendliness, energy efficiency, carbon neutrality, industrial waste, resource saving, low water demand cement