Recycling of Coal Combustion Waste through Production of Foamed Geopolymers with Improved Strength

Elena Alfredovna Yatsenko, Boris Mikhailovich Goltsman, Yuri Vladimirovich Novikov (), Sergey Vyacheslavovich Trofimov, Anna Vladimirovna Ryabova, Victoria Alexandrovna Smoliy and Lyudmila Vasilievna Klimova
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Elena Alfredovna Yatsenko: The Department “General Chemistry and Technology of Silicates”, Technological Faculty, Platov South-Russian State Polytechnic University (NPI), Prosveshcheniya Street 132, Rostov Region, 346428 Novocherkassk, Russia
Boris Mikhailovich Goltsman: The Department “General Chemistry and Technology of Silicates”, Technological Faculty, Platov South-Russian State Polytechnic University (NPI), Prosveshcheniya Street 132, Rostov Region, 346428 Novocherkassk, Russia
Yuri Vladimirovich Novikov: The Department “General Chemistry and Technology of Silicates”, Technological Faculty, Platov South-Russian State Polytechnic University (NPI), Prosveshcheniya Street 132, Rostov Region, 346428 Novocherkassk, Russia
Sergey Vyacheslavovich Trofimov: The Department “General Chemistry and Technology of Silicates”, Technological Faculty, Platov South-Russian State Polytechnic University (NPI), Prosveshcheniya Street 132, Rostov Region, 346428 Novocherkassk, Russia
Anna Vladimirovna Ryabova: The Department “General Chemistry and Technology of Silicates”, Technological Faculty, Platov South-Russian State Polytechnic University (NPI), Prosveshcheniya Street 132, Rostov Region, 346428 Novocherkassk, Russia
Victoria Alexandrovna Smoliy: The Department “General Chemistry and Technology of Silicates”, Technological Faculty, Platov South-Russian State Polytechnic University (NPI), Prosveshcheniya Street 132, Rostov Region, 346428 Novocherkassk, Russia
Lyudmila Vasilievna Klimova: The Department “General Chemistry and Technology of Silicates”, Technological Faculty, Platov South-Russian State Polytechnic University (NPI), Prosveshcheniya Street 132, Rostov Region, 346428 Novocherkassk, Russia

Sustainability, 2023, vol. 15, issue 23, 1-17

Abstract: Recycling of industrial waste into useful materials is a crucial aim for achieving sustainable development in materials science. The use of production waste in the manufacture of construction materials contributes to improving the environmental situation and reducing the cost of the final product. This article examines the utilization of coal combustion waste recycled into foamed geopolymers and ways of enhancing their strength properties through the introduction of strengthening additives. Eight compositions of foamed geopolymers containing different strengthening additives were synthesized. Inorganic substances (CaO, MgO, ZnO, TiO 2 , Al 2 O 3 , SiC, and ZrO 2 ) were chosen as strengthening additives that were introduced in an amount of 3% (over 100%). The physical and mechanical properties (density, compressive strength, porosity, and pore size distribution) of the obtained samples were studied and compared. Magnesium oxide MgO and aluminum oxide Al 2 O 3 were chosen as the best strengthening additives. Magnesium oxide allows geopolymer materials with the lowest density to be obtained. Aluminum oxide can significantly increase the strength of geopolymers. The phase composition of the samples contains new crystalline phases in the form of α-alumina and periclase. The porous structure is homogeneous and meets the requirements for foamed thermal insulation materials. The strengthening effect of the chosen additives was verified using geopolymers based on different waste from Novocherkassk SDPP.

Keywords: coal combustion waste; foamed geopolymer; strengthening additives; foaming agent; Arctic zone; road construction (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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