Efficiency evaluation of the milling process based on the granulometric analysis of crushed stone-mastic asphalt concrete granulate

Introduction. The working process of milling asphalt concrete pavements. The working process of asphalt concrete milling is considered as a set of destruction processes of the stone fraction, bitumen bonds and other phenomena unrelated to the formation of new surfaces. The conducted analysis is based on the assessment of the ratio of energy spent on milling in general and the energy needed for the formation of new surfaces made from separate fractions of asphalt concrete granulate and crushed stone aggregate.

Materials and methods. The work is based on carried out experimental studies of the granulometric composition of asphalt concrete granulate obtained by milling crushed stone-mastic asphalt concrete pavement, and, separately, the stone fraction of asphalt concrete got by burning out a bitumen matrix. A standard method was also used to determine the specific energy of destruction of bitumen bonds when determining the fracture disruption resistance of a sample in tension while splitting.

Results. As a result of sieving, granulometric curves of the composition of asphalt concrete granulate and stone fraction were obtained. Calculation methods have determined the components of energy consumption for the formation of new surfaces made from asphalt concrete granulate and new surfaces from stone fraction.

Discussion and conclusion. At the end of the study, quantitative ratios of various fractions of asphalt concrete granulate of stone-mastic asphalt concrete formed during milling, as well as the crushing grade of stone fractions, were obtained. The specific energy consumption during the milling of asphalt concrete has been determined. It was found that the largest part of the energy during milling (64.7% for this study) is needed for the destruction of bitumen bonds. The vast majority of this energy is used for the formation of the fine granulate fraction. An insignificant part of the energy is spent on the destruction of the stone fraction. In general, the share of energy consumption aimed at the formation of new surfaces accounts for this study 66.14% of the total energy costs. The research development prospects of granulometric analysis for evaluating the effectiveness of the asphalt concrete milling process have been noted.

1. Sivachenko L.A., Sivachenko T.L. Technological mechanical engineering – the innovative reserve of the world economy: monograph. Mogilev: Belarusian. Russian University, 2017: 254. (Russ.)

2. Vlasenko D.A., Levchenko E.P. Mathematical modeling and increasing the efficiency of impact rotary crushers with combined suspension of hammers: monograph. Alchevsk: State Educational Institution of the LPR “DonGTU”, 2020: 143. (Russ.)

3. Shevchenko A.F. Ways to intensify the cement grinding process. Voprosy Khimii i Khimicheskoi Tekhnologii. 2008; 5: 129–137. (Russ.)

4. Sivachenko L.A. Modern technological engineering: reserves of development. Mechanical engineer. 2011; 1: 11–21. (Russ.)

5. Sakhapov R.L., Makhmutov M.M. Influence of the studied factors on milling power. Izvestia of Samara Scientific Center of the Russian Academy of Sciences. 2015; Volume 17, No. 2(4): 896–899. (Russ.)

6. Karoshkin A.A., Krasnoludsky A.B. Determination of the energy intensity of the milling process with a milling cutter with a complex tooth movement. Izvestiya Tula State University (Izvestiya TulGU) Lifting and transport machinery and equipment. Tula. 2003; Issue 4: 167–173. (Russ.)

7. Cundall P.A. A computer model for simulating progressive largescale movements in blocky rock systems. In: Proceedings of the Symposium of International Society of Rock Mechanics, v.1, Nancy: France; 1971. Paper No. II–8

8. Liqun Zhou, Yi Liu, Zhennan Wang et al. Numerical analysis of asphalt concrete milling process based on multicomponent modeling, 09 July 2020, PREPRINT (Version 1) available at Research Square. DOI: https://doi.org/10.21203/rs.3.rs-39326/v1.

9. Petrescu MG, Dumitru T, Laudacescu E, Tănase M. Experimental Investigation and Numerical Analysis Regarding the Influence of Cutting Parameters on the Asphalt Milling Process. Materials (Basel). 2024 Jul 13; 17(14): 3475. doi: 10.3390/ma17143475. PMID: 39063767; PMCID: PMC11278129.

10. Dumitru, T.; Petrescu, M.G.; Tănase, M.; Ilincă, C.N. Multi-Response Optimization Analysis of the Milling Process of Asphalt Layer Based on the Numerical Evaluation of Cutting Regime Parameters. Processes 2023, 11, 2401. https://doi.org/10.3390/pr11082401.

11. Wu, J., Zhang, B., Wu, C., Shu, Z., Li, S. et al. (2021). Discrete element simulation of asphalt pavement milling process to improve the utilization of milled old mixture. Journal of Renewable Materials, 9(5), 993–1011. https://doi.org/10.32604/jrm.2021.014304

12. Griffith A. A. The theory of rupture. Proc. Ict. Int. Congr. Appl. Mech. Delft. 1924: 55–63.

13. Orowan E. Fracture and strength of solids. Repts. Progn. Phis., 1948; 49, № 12: 185–232.

14. Irwin G.R. Analysis of stresses and straines near the end of crack travers-ing a plate. Mech. 1957; Vol. 24. No 3: 361–364.

15. Romaniuk V.N. Exergy of Asphalt Concrete Mix. ENERGETIKA. Proceedings of CIS higher education institutions and power engineering associations. 2003; (4): 69–76. (In Russ.) https://doi.org/10.21122/1029-7448-2003-0-4-69-76

16. Simonov P.S. Single-impact rock crushing experiment. MIAB. Mining Inf. Anal. Bull. 2020; (1): 71-79. ([In Russ). DOI: 10.25018/0236-1493-2020-1-0-71-79.

17. Golik V.I.et al. Research of the properties of rocks during fragmenting and crushing in mechanical mills. News of the Ural State Mining University. 2021; Issue 2(62): 81–87 (in Russ.) DOI 10.21440/2307-2091-2021-2-81-87

18. Vinnikov V. A., Pavlov I. A. Change in fracture toughness of rocks under moderate thermal effect. MIAB. Mining Inf. Anal. Bull. 2024; (3): 5–16. [In Russ]. DOI: 10.25018/0236-1493-2024-3-0-5

19. Furmanov D.V., Chizhov V.S., Lysakov N.E. Experimental determination of cutting resistance forces during destruction of asphalt concrete by a single cutting element. The Russian Automobile and Highway Industry Journal. 2020; 17(2): 196–207. (In Russ.) https://doi.org/10.26518/2071-7296-2020-17-2-196-207

20. Furmanov D.V., Lysakov N.E., Shamakhov L.M. Experimental and analytical justification of the asphalt concrete cutting process by road milling machines working equipment. The Russian Automobile and Highway Industry Journal. 2022; 19(2): 170–182. (In Russ.) https://doi.org/10.26518/2071-7296-2022-19-2-170-182