Modification of conditions and properties of dispersed reinforcing fiber during construction and operation of asphalt concrete pavements

Purpose: Identification of deformation presence or absence, fiber destruction in manufacturing asphalt concrete mixes contain ning polymer fiber.

Methodology: Initial dispersed reinforcing fiber made of thermoplastic fiber-forming polymer and mineral thread, fiber extracted from asphalt concrete, and fiber exposed to weather conditions are investigated using a weatherometer IP-1-3. Аn MIM-10 metallographic microscope is used for the metallographic analysis. The infrared spectrophotometer SPECORD M-80 is used for the material identification. Physicochemical tests of fiber are carried out in a certified laboratory "Khimvolokno".

Research findings: Dispersed reinforcing fiber made of thermoplastic fiber-forming polymers show deformation in compacting the asphalt-concrete mix at impact points of mineral material grains. At the same time, mineral fiber used as a dispersed reinforcement is not subjected to such deformation. The fiber properties are not affected by natural and climatic factors. It is found that natural and climatic factors do not cause the fiber destruction in dispersed reinforcement. The properties of reinforcing fiber slightly change, which allows them to perform a reinforcing function throughout the established service life of asphalt concrete pavements. Indentation of mineral material grains into fiber made of thermoplastic polymers leads to fiber jamming by grains, that prevents them from being pulled out, that, in turn, increases strength and rheological properties of asphalt concrete.

Value: The analysis of chemical fiber characteristics is requireв to satisfy the growing interest in dispersed reinforcement of asphalt concrete. The quality of polymer fiber used for reinforcement can be changed under the influence of external factors and affect the quality of road pavements.

1. Gezentsvei L.B. (Ed.), Gorelyshev N.V., Boguslavskii A.M., Korolev I.V. Asphalt concrete. 2nd ed., Moscow: Transport, 1985. 350 p. (In Russian)

2. Sevil K., Perviz A., Baurzhan K. Performance evaluation of bitumen modified by various types of waste plastics. Construction and Building Materials. 2014; (73): 592–602.

3. Süreyya T., Halit Ö., Atakan A. Investigation of rutting performance of asphalt mixtures containing polymer modifiers. Construction and Building Materials. 2007; (21): 328–337.

4. Lukashevich V.N., Efanov I.N. Application of percolation theory in studying structure formation of dispersion-reinforced asphalt concrete. Tekhnika i tekhnologiya dorozhnogo khozyaistva. 2014; 2 (28): 29–39. (In Russian)

5. Chernov S.A., Kaklyugin A.V., Nikitina A.N., Golyubin K.D. Influence of polymer dispersionreinforcing additive on asphalt concrete performance. Vestnik MGSU. 2017; 6 (105): 654–660. DOI: 10.22227/1997-0935.2017.6.654-660 (In Russian)

6. Korolev I.V. Model of bitumen film structure on mineral grains in asphalt concrete. Izvestiya vuzov. Stroitel'stvo i arkhitektura. 1981; 8: 63–67. (In Russian)

7. Korolev I.V., Ageeva E.N. Golovko V.A., Fomenko G.R. Warm asphalt concrete, 2nd ed. Kiev: Vishcha shk, 1984. 200 p. (In Russian)

8. Korolev I.V. Bituminous film thickness in asphalt concrete. Soyuzdornii. 1970; 46: 20–26. (In Russian)

9. Zazulina Z.A., Druzhinina T.V., Konkin A.A. Fundamentals of chemical fiber technology, 2nd ed., Moscow: Khimiya, 1985. 304 p. (In Russian)

10. Rogovin Z.A. Fundamentals of chemistry and chemical fiber technology. Saint-Petersburg, 2001. 148 p. (In Russian)

11. Bellamy L.J. The infra-red spectra of complex molecules. Moscow: Mir, 1971. 319 p. (Russian translation)

12. Nakanisi K. Infrared spectra and structure of organic compounds. Moscow: Mir, 1965. 216 p. (Russian translation)

13. Lebedev A.T. Mass spectrometry in organic chemistry. Moscow: BINOM. Laboratoriya znanii, 2003. 493 p. (In Russian)

14. Ivanova L.V., Safieva R.Z., Koshelev V.N. IR spectrometry in the analysis of oil and petroleum products. Vestnik bashkirskogo un-ta. 2008; 13 (4): 869–874. (In Russian)

15. Niyazi U.K., Sevil K. Aggressive environmental effect on polypropylene fibre reinforced hot mix asphalt. Procedia Engineering. 2016; 161: 963–969. DOI: 10.1016/j.proeng.2016.08.834