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At present, the issue of environmental protection is very important in the world. In Portland cement production a large amount of greenhouse gas is released, namely 8 % of all world anthropogenic emissions. CO2 emissions from cement production are associated with fuel combustion and decomposition of limestone during firing of the raw mixture. Scientists around the world are trying to reduce the amount of carbon dioxide released by replacing the main component of cement ? clinker with various additives. In recent y...