Abstract
The article deals with the control over the structure formation processes of cement systems through the introduction of superabsorbent polymer additives in the composition. The formation of thin polyacrylic films due to delayed polymerization of acrylic acids in aqueous solution in the cement composite structure will provide the hardening Portland cement with water reserve for hydration without loss of mobility of the mixture contributing to the reduction of shrinkage deformations and obtaining a composite with high performance properties. It is shown that for the selection of superabsorbent polymer for cement systems it is advisable to use both the rheological method and NMR relaxometry. An obvious advantage of the NMR method is the non-destructive nature of the impact on the material which makes it possible to more reliably determine the structural-kinetic parameters and analyze the features of the structure transformation over time. It is established that such an indicator as the period of viability can be used to assess the features of the structuring of acrylate super-absorbent polymers when selecting optimal concentrations of its components. Experimental and statistical models describing the dependence of the depth of structuring and the period of viability on the amount of the catalyst and the polymer part of the super-absorbent polymer are obtained.
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