Polyfunctional Additive with Ultradispersed Microsilica for Cement Concrete

Gurinenko N., Batyanovskiy E.

ABSTRACT

The material of the article contains the results of studies of the influence on the hydration processes, hardening and properties of the cement stone of the developed complex polyfunctional additive combining the plasticizing effect with the effects of accelerating hardening and compacting the structure of cement concrete. It includes chemical substances – plasticizer, additives to accelerate and compact the structure of concrete, as well as a mineral additive - amorphous ultrafine micro silica.

With the use of standardized and common methods, as well as with the use of modern research methods and equipment (laser dispersity analyzer, derivatographic and X-ray phase analysis, pH-metry, etc.), the regularities of the influence of the developed polyfunctional additive on structural and morphological changes and properties of cement stone, predetermining properties of cement concrete. In particular, the influence on the growth kinetics and strength level, heat release during hardening, the change in the alkalinity (pH) level as the basis for the safety of steel reinforcement in reinforced concrete, the degree of hydration (by the amount of water bound by cement) as a base for growth of impermeability of concrete.

The effectiveness of a multifunctional additive has been experimentally confirmed in comparison with known analogs, including multicomponent additives containing traditional micro silica. It was shown that it is possible to replace the 10 % additive from the mass of cement of traditional micro silica with a 1.0 % dosage of ultrafine micro silica, which is part of the polyfunctional additive. The transition to the use of ultrafine silica significantly simplifies the technology of concrete preparation, as there is no need to equip concrete mixing plants with additional equipment for the introduction of micro silica.

Keywords: cement, micro silica, micro silica ultra dispersible, hardening, cement stone, structure, strength, properties, concrete.

For citation: Gurinenko N., Batyanovskiy E. Polyfunctional Additive with Ultradispersed Microsilica for Cement Concrete. Contemporary Issues of Concrete and Reinforced Concrete: Collected Research Papers. Minsk. Institute BelNIIS. Vol. 10. 2018. Pp. 135–154. https://doi.org/10.23746/2018-10-09 (in Russian)

Full text in Russian:



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