Interaction Mechanisms in «Portland Cement-Functional Polymer Mineral Additives» Binder Produced by Different Methods.

The construction industry is the main consumer of mineral resources. At the same time, the Portland cement (PC) industry occupies a leading position, using expensive, high-quality raw materials. This is due to the high rate of construction in different areas (industrial, civil, road construction, etc.). The widespread application of PC is due primarily to the strength and durability of composite materials based on it. Taking into account their specific purpose, PC-based composites are usually optimized to achieve specified characteristics and rational use of raw materials. To reduce PC consumption and justify the possibility of its use in complex binders, this manuscript analyzes the composition of a functional polymer-mineral additive; the nature and mechanisms of its interaction with PC depend on the method of introducing the additive (dry mixing/joint grinding of the clinker-gypsum mixture with the additive at the stage of binder preparation). Based on the data of XRD, IR, and SEM analysis, as well as taking into account patent information, the composition of the additive was clarified. The combined application of the above methods allowed us to establish the uniformity of the additive distribution in the binder depending on the introduction method and to evaluate the effect of each additive component and its mutual impact on the processes occurring during cement hydration. As a result, it was established that the most effective introduction method is combined grinding. A phenomenological model of the structure formation of additives containing cement paste is proposed. The binder production by the combined grinding method promotes the intensification of the processes occurring during hydration, as evidenced by the data of qualitative and quantitative XRD, IR, and DTA analysis, differential scanning calorimetry (DSC), and TGA analysis.