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  5. Optimization of dossiers content in compositional materials by experimental and statistical modeling methods

Optimization of dossiers content in compositional materials by experimental and statistical modeling methods

K. Plakhotnikov, O. Starkova, T. Kostyuk, D. Bondarenko
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Description: The possibility of obtaining a rational content of methylcellulose and complex chemical additives in the composition of a heat-insulating composite on the basis of Portland cement is considered in order to achieve maximum depth of penetration of a composite fluid into a structure of concrete or other mineral substrates. Dos-tracking of composite material consisting of aluminosilicate microspheres, portland cement, methylcellulose additive and complex chemical additive, which contributes to the additional synthesis of crystalline hydrates with aluminate and silicate phases of cement. The structure of the composite at the microlevel is investigated by means of electron microscopy. Rational content of supplements was carried out using statistical methods of planning the experiment, obtaining a mathematical model and constructing a response surface using the tools of the package Statistica 6.0. The quantitative selection of a complex chemical additive can further synthesize on the surface of microspheres crystalline hydrates in the form of gel aggregates CSH, fibers of etringitis and laminar C4AH13. With excessive amounts of methylcellulose additives and the lack of a complex chemical additive, the integrity of the crystalline shell on the surface of the microspheres is violated and the penetration depth of the substrate applied to the porous (concrete, brick, etc.) composite material is reduced, which reduces its adhesion to the base. The most rational is the value when the content of methylcellulose and complex chemical additives is maximal or minimal, within the limits set by search experiments, but taking into account the economic component, it is advisable to choose the values in the minimal limits with the most rational one.


Keywords: aluminosilicate and glass microspheres, penetration depth, matrix of planning, re-grazing equation, normalized, natural variables

Reference:
Plakhotnikov, K.V., Starkova, O.V., Kostiuk, T.O. and Bondarenko, D.O. (2018), “Optymizatsiia vmistu dobavok u skladakh kompozytsiinykh materialiv metodamy eksperymentalno-statystychnoho modeliuvannia” [Optimization of dossiers content in compositional materials by experimental and statistical modeling methods], Information Processing Systems, Vol. 1(152), pp. 68-73. https://doi.org/10.30748/soi.2018.152.10.