Influence of additives with various action spectrum on concrete mixture heat generation in transport construction

The article deals with topical issues of heat generation processes in concrete mixtures made with additives of various origins and action spectrums (mainly plasticizing and hyper plasticizing) in transport construction. They are widely used in recent years, as well as modifiers based on micro silica. The paper presents analysis of existing methods for determining the hydration heat of Portland cement. It demonstrates rationale principle scheme of the automated calorimetric unit, which gives the most accurate measurement results of changing compositions of concrete mixture and has found wide application in practice. The article demonstrates results of heat generation in concrete mixes based on cement binders prepared with plasticizers, a hyperactive plasticizer based on polycarboxylate and a concrete mix with the MB-10-01 modifier. The study shows expediency of such tests in approbation and implementation of high-grade concrete mixtures with modern additives. They have direct impact on the processes occurring in hardening concrete as well as the need to take into account the obtained data in process of designing and constructing transport infrastructure facilities for various purposes.