Water Structure and Its Influence on Cement Stone and Concrete Properties

Obtaining concrete with predetermined properties is the most important task of construction material science. Along with the use of chemical additives of different nature of action in concrete technology, the use of activation of their components, including mixing water, to influence the structure of binding materials is of certain interest. The performed researches are devoted to the study of water structure changes after mechanoactivation in a disintegrator unit. Changes in the pH of water, its electrical conductivity, vapor magnetic properties, and disordered water structure were revealed. The effect of activated mixing water on cement stone structure formation and concrete strength was studied. X-ray phase, thermogravimetric analysis and electron microscopy revealed that mechanoactivation of mixing water changes the kinetics of Portland cement hydration: increases the degree of hydration, accelerates the crystallization of calcium hydroxide, increases the homogeneity of new formations. The use of activated water increases the compressive strength of concrete by (8 -13)% depending on the composition. The results of studies have shown that mechanoactivation contributes to the increase in the activity of water as a chemical and structure-forming component in binder systems.

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