Study on mechanical properties of alkali-activated material before and after mechanical activation

Michal Marcin, Martin Sisol, Ivan Brezáni, Dominika Behunová

Study on mechanical properties of alkali-activated material before and after mechanical activation

Číslo: 1/2018
Periodikum: Acta Montanistica Slovaca

Klíčová slova: slag, mechanical properties, geopolymers, strength, water absorption, mechanical activation

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Anotace: Slag is one of the by-products of energy industry which is suitable for secondary industrial processing. Although slag has been

successfully used in industrial production for several decades, its use does not achieve the level of its potential. Slag can be used as alkaliactivated materials and utilised in the synthesis of geopolymers. Geopolymers are inorganic polymeric materials with three-dimensional
SiOAl frameworks synthesised from aluminosilicates which dissolved in the alkaline medium. This work describes the improvement of
mechanical properties of alkali-activated binders – geopolymers made of slag. The effect of mechanical activation on mechanical properties
of geopolymers was examined. Mechanical activation was made with a ball mill and different time of milling. Synthesis of geopolymers was
carried out in drier at 80°C. Samples were made before and after mechanical activation. The differences in strengths of samples were
examined. Mechanical properties such as compressive and flexural strength that was measured were the most significant attributes. Samples
were tested after 7, 28 and 90 days. Results show that the mechanical activation is an important factor in the synthesis of slag based
geopolymers, which has better properties after mechanical activation.