Influence of the CaO-containing modifiers on the properties of alkaline alyumosilicate binders

Authors

DOI:

https://doi.org/10.15587/1729-4061.2019.161758

Keywords:

alkaline aluminosilicate, CaO-containing modifier, artificial stone, phase composition, structure formation

Abstract

The basis for ensuring the resistance of artificial stone based on alkaline aluminosilicate binders to variable environmental conditions is the formation of zeolite- and mica-like hydrate neo-formations.

It is possible to control the structure forming processes and, as a result, the operational properties of alkaline hydro aluminum silicates using the variation of the ratio of basic oxides of the binder, dispersiveness of particles and hardening conditions. It was noted that in order to obtain high operational characteristics of a stone based on alkali aluminosilicate binders, there is a need for elevated temperature of their hardening.

The research shows that it is possible to ensure water resistance of artificial stone at hardening under normal conditions at the expense of the modification of the binder by Ca-containing additives.

The influence of CaO-containing modifiers of different phase composition on physical and mechanical properties of artificial stone based on alkali aluminosilicate binders was explored. Ensuring water resistance of artificial stone at its hardening under conditions of normal temperatures was proved by experimental research and its phase composition was studied. The kind and the optimal amount of CaO-containing modifiers to provide for operational properties of artificial stone were determined. The use of CaO-containing modifiers of alkaline aluminosilicate binders ensures the acceleration of their structure formation and contributes to an increase in water resistance and strength under normal conditions.

The influence of CaO-containing modifiers of various morphological type on physical and mechanical properties of artificial stone based on alkaline aluminosilicate binders was studied. It was established that on day 28of hardening at ambient temperature of 20±2 °С regardless of the type of introduction of Ca-containing modifiers, artificial stone is characterized by strength at compression from 14.2 to 42.8 MPa with a coefficient of water resistance from 0.81 to 1.05 due to the formation in combustion products of the mixture of high- and low-base calcium hydro silicates and zeolite-like neo-formations of the hybrid type – calcium-sodium hydroaluminosilicates with an insignificant content of Na- and K-heulandite. It was shown that water resistance of artificial stone in the early periods of hardening at ambient temperature of 20±2 °С is ensured due to the formation in hydration products of the binder of high- and low-base calcium hydro silicates, formed due to hydration of Portland cement, ground slag and slaked lime. It is possible to accelerate the kinetics of strength gaining with ensuring the water resistance of artificial stone using liquid glass with silicate module of 2.0–2.6 and lime content in the amount of 2.0–3.0 % percent of the weight of alkaline aluminosilicate binder as an alkaline component. It was noted that hydraulic activity of Ca-containing modifiers decreases in the series Slag>Са(ОН)2>СаСО3>Portland cement>Alumina cement

Author Biographies

Volodymyr Kyrychok, Kyiv National University of Construction and Architecture Povitroflotsky ave., 31, Kyiv, Ukraine, 03037

PhD

V. D. Glukhovsky Scientific Research Institute for Binders and Materials

Pavlo Kryvenko, Kyiv National University of Construction and Architecture Povitroflotsky ave., 31, Kyiv, Ukraine, 03037

Doctor of Technical Sciences, Professor

V. D. Glukhovsky Scientific Research Institute for Binders and Materials

Sergii Guzii, Kyiv National University of Construction and Architecture Povitroflotsky ave., 31, Kyiv, Ukraine, 03037

PhD, Senior Researcher

V. D. Glukhovsky Scientific Research Institute for Binders and Materials

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Published

2019-04-02

How to Cite

Kyrychok, V., Kryvenko, P., & Guzii, S. (2019). Influence of the CaO-containing modifiers on the properties of alkaline alyumosilicate binders. Eastern-European Journal of Enterprise Technologies, 2(6 (98), 36–42. https://doi.org/10.15587/1729-4061.2019.161758

Issue

Vol. 2 No. 6 (98) (2019): Technology organic and inorganic substances

Section

Technology organic and inorganic substances

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Copyright (c) 2019 Sergii Guzii, Volodymyr Kyrychok, Pavlo Kryvenko

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