INCREASING REACTIVITY OF ASH AND SLAG WASTE FOR THEIR UTILIZATION IN ROAD CONSTRUCTION
Keywords:
ash and slag waste, fly ash, mechanical activation, production waste disposal, road construction materialsAbstract
This paper shows the effectiveness of using the mechanical activation method to increase the reactivity of fly ash, which will ensure its effective utilization in road soil concrete compositions. It has been established that mechanical activation makes it possible to increase the specific surface area of ash and the amount of carbonate phases. This will help improve the strength characteristics of soil concrete. Mechanical activation of fly ash was carried out using a vibrating bowl grinder in air for 60 s, sample loading into the grinding jar was 50 g. The ratio of the mass of steel grinding bodies (roller and ring) to the mass of the sample was 32:1, the dose of mechanical energy supplied was 0.72 kJ/g. It was revealed that as a result of mechanical activation in the ash, the processes of dehydration and carbonization occur. It is shown that the mechanical activation of fly ash leads to a decrease in the true density from 1587 to 1469 kg/m3 and an increase of its specific surface from 3130 to 6110 m2/kg, which indicates of the possibility of more efficient filling of microvoids and pores with ash particles during the formation of the soil concrete structure.
References
Власова В.В., Власов А.И. Особенности процесса механоактивации золошлаковых отходов теплоэлектростанций // Горный информационно-аналитический бюллетень. – 2009. – № S15. – С. 351-355.
Ломовский О.И., Болдырев В.В. Механохимия в решении экологических задач // Эко-логия. Серия аналитических обзоров мировой литературы. – 2006. – № 79. – С. 1-221.
Калинкин А.М., Гуревич Б.И., Калинкина Е.В., Залкинд О.А. О гидратации механоактивированной низкокальциевой золы ТЭС // Химия в интересах устойчивого развития. – 2018. – Т. 26. – № 4. – С. 395-402.
Калинкин А.М., Гуревич Б.И., Калинкина Е.В., Семушин В.В., Залкинд О.А. Синтез геополимеров на основе золы уноса с применением механоактивации // Труды Ферсманов-ской научной сессии ГИ КНЦ РАН. – 2020. – № 17. – С. 241-245.
Кожухова Н.И., Жерновский И.В., Фомина Е.В. Фазообразование в геополимерных системах на основе золы-уноса Апатитской ТЭЦ // Строительные материалы. – 2015. – № 12. – С. 85-88.
Endzhievskaya I.G., Vasilovskaya N.G., Dubrovskaya O.G., Baranova G.P., Chudaeva A.A. The effect of mechanical activation on the stabilization of ash properties of Krasnoyarsk CHP // Journal of Siberian Federal University. Engineering & Technologies. – 2018. – № 11 (7). – pp. 842-855.
