Modification of fly ash physicochemical properties for using in dispersionhardened bitumen-based pavement

One of the ways is substantiated to solve the most important environmental problems currently arising in the development and functioning of the heat and power complex. The first is the elimination of fly ash dumps formed during coal combustion. The second is utilization of fibrous sorbents exhausted during the elimination of emergency oil spills, products, shale tars, coal fuses. It is shown that fine ash and asphalt-concrete compositions reinforced with chemical fibers obtained from end-of-life fibrous sorbents, can be used in the pavement construction. The number of properties of hydraulic fly ash and neutralization of sesquioxides contained in them are improved. The latter are catalysts for oil bitumen aging. It is shown that the proposed solutions lead to a decrease in the bitumen content in the fly ash, increase in average density, decrease in porosity and true density. This provides its use in construction of reinforced pavements without increasing the oil bitumen consumption. Highly active components contained in petroleum products neutralize the ability of sesquioxides to accelerate the aging process of petroleum bitumen, which is confirmed by IR spectroscopy.

waste disposal, fly ash, ash dump, dispersed reinforcement, fibrous sorbents, pavement, porosity, average density, bitumen content, organic binder aging, sesquioxides

1. Rossiiskaya Federatsiya. Prezident. Osnovy gosudarstvennoi politiki v oblasti ekologicheskogo razvitiya RF na period do 2030 goda: utverzhden 30.04.2012 Prezidentom Rossiiskoi Federatsii [Russian Federation. Fundamentals of the state policy in the field of environmental development of the Russian Federation for the period up to 2030. Approved on 30.04.2012 by the President of the Russian Federation]. Moscow, 2019. Available: http://government.ru/docs/7280/ (accessed October 28, 2022). (rus)

2. Rossiiskaya Federatsiya. Pravitel'stvo. Energeticheskaya strategiya Rossii na period do 2030 goda: utverzhdena rasporyazheniem Pravitel'stva Rossiiskoi Federatsii ot 13 noyabrya 2009 g. N 1715-r [Russian Federation. Energy Strategy of Russia for the period up to 2030. Approved by the Russian Federation Government Order No. 1715-r, November 13, 2009.]. Available: https://minenergo.gov.ru/node/15357 (accessed October 30, 2022). (rus)

3. Putilov V.Ya., Putilova I.V. Konditsionirovanie zoloshlakov energetiki v Rossii [Conditioning of ash and slag from power plant generation in Russia]. In: Zoloshlaki energetiki: materialy XVII Mezhdunarodnoi konferentsii (Proc. 17th Int. Conf. ‘Ash and Slag from Power Generation’). Varshava, 2010. Pp. 27−42. (rus)

4. Utilization direction of industrial raw products built-up in power station ash dumps. MATEC Web of Conferences. 2017. V. 92. Article number 01074. Pp. 1−5.

5. Zoloshlakovye otkhody [Ash and slag wastes]. Pt. 1. Na poroge ekologicheskogo kollapsa. Available: http://ect-center.com/blog/zoloshlakovie-othody (accessed October 30, 2022). (rus)

6. Putilin E.I., Tsvetkov B.C. Primenenie zol-unosa i zoloshlakovykh smesei pri stroitel'stve avtomobil'nykh dorog [Application of fly ash and ash-and-slag mixtures in road construction. Overview of Russian and foreign experience in the use of waste from solid fuel combustion at thermal power plants]. Moscow, 2003. 40 p. Available: www.complexdoc.ru/ntdtext/545081/6 (accessed October 30, 2022). (rus)

7. Gorunovich S.B. Ispol'zovanie zoloshlakov v stroitel'stve v kontekste prodleniya srokov ekspluatatsii zolootvalov TETs [Ash and slag use in construction in terms of extending the service life of TPP ash dumps]. Novosti teplosnabzheniya. 2016. No. 7 (190). Available: www.rosteplo.ru/Tech_stat/stat_shablon.php?id=3227 (accessed October 30, 2022). (rus)

8. Putilov V., Putilova I. Properties of coal ash in Russia. In: Proc. 2nd EuroCoalAsh Conference. Copenhagen, Denmark, 2010. Pp. 71−76.

9. Lukashevich V.N., Lukashevich O.D., Prokof'eva G.I., Vaks I.V. Primenenie slantsevykh fusov v sostave asfal'tobetonnykh smesei [The use of shaly sludge in bitumen-concrete mixes]. Vestnik of Tomsk State University of Architecture and Building. 2016. No. 6. Pp. 218–225. (rus)

10. Lukashevich V.N., Efanov I.N. Issledovanie vliyaniya tekhnologii prigotovleniya asfal'tobetonnykh smesei na protsessy stareniya asfal'tovogo vyazhushchego pri ispol'zovanii voloknistykh sorbentov v kachestve dispersnoi armatury [Effect of bitumen-concrete mix preparation on asphalt binder aging processes when using fibrous sorbents as disperse reinforcement]. Vestnik of Tomsk State University of Architecture and Building. 2012. No. 2. Pp. 193−198. (rus)

11. Shutov F. Recycling of fly ash for production of plastic lumber. The Journal of Solid Waste Technology and Management. In: Proc. Int. Conf. on Solid Waste. Philadelphia. USA, 2007.

12. Shamrai E.I., Taskin A.V., Ivannikov S.I., Yudakov A.A. Issledovanie vozmozhnostei kompleksnoi pererabotki otkhodov predpriyatii energetiki Primorskogo kraya [Possibilities of integrated recycling of waste from power enterprises in Primorsky Krai]. Sovremennye naukoemkie tekhnologii. 2017. No. 3. Pp. 68−75. Available: www.top-technologies.ru/article/view?id=36618 (accessed October 15, 2022). (rus)

13. Lekarevich S.S., Lunev A.A. Obosnovanie vozmozhnosti krupnotonnazhnogo ispol'zovaniya ZShM na ob"ektakh dorozhnogo stroitel'stva g. Omska [Possibility of large-tonnage use of ash-and-slag mixtures on road construction sites in Omsk]. Assotsiatsiya sodeistviya razvitiyu promyshlennogo klastera po ispol'zovaniyu i pererabotke zoloshlakovykh materialov. Omsk, 2017. Available: http://cluster55.ru/nauchnye-razrabotki/ (accessed October 15, 2022). (rus)

14. Otmakhov V.I., Filonenko D.A., Volokitin G.G., Skripnikova N.K., Avkhimovich A.V. Tekhnologicheskaya liniya po proizvodstvu polimernogo voloknistogo sorbenta dlya ochistki vodnykh ob"ektov ot nefti i nefteproduktov [Production line of polymeric fibrous sorbent for water body purification from oil and petroleum products]. Ekologiya promyshlennogo proizvodstva. 2007. No. 2. Pp. 74–77. (rus)

15. Vertyachikh I.M., Zhukalov V.I. Polimernye voloknistye Melt Blowing materialy dlya likvidatsii avarii s razlivami nefti i nefteproduktov [Polymeric fibrous melt blowing materials for oil and petroleum product spill response]. Chrezvychainye situatsii: obrazovanie i nauka. 2011. V. 6. No. 1. Pp. 53–58. (rus)

16. Kravtsov A.G., Marchenko S.A., Zotov S.V. Polimernye voloknistye fil'try dlya preodoleniya ekologicheskikh posledstvii chrezvychainykh situatsii [Polymeric fiber filters for overcoming environmental consequences of emergencies]. Gomel, 2008. 280 p. (rus)

17. Lukashevich V.N., Lukashevich O.D., Mokshin R.I. Vliyanie tekhnologii proizvodstva na asfal'tenogenez v dispersno-aromirovannykh bitumomineral'nykh kompozitsiyakh [Manufacture-affected asphaltene genesis in dispersion hardened bitumen-mineral compositions]. Vestnik Tomskogo gosudarstvennogo arkhitekturno-stroitel'nogo universiteta – Journal of Construction and Architecture. 2022. V. 24. No. 5. Pp. 178−188. DOI: 10.31675/1607-1859-202224-5-178-188 (rus)