Article 4 # 4’2018

Nagaychuk, V. M., Candidate of Technical Sciences (Ph.D.), Senior Research Officer; Illiash, S. I., Chief of Department; Tereshchenko, T. A., Candidate of Chemical Sciences (Ph.D.), Senior Research Officer (SE «M. P. Shulhin State Road Research Institute»)
PARTICULARITIES OF HOT-IN-PLACE RECYCLING WITH CHANGING THE ASPHALT CONCRETE MIXTURE AGGREGATE GRADATION. DOI: 10.33868/0365-8392-2018-4-256-20-27

Abstract. The hot in-place recycling (HIR) belongs to the successful strategies of asphalt concrete pavements rehabilitation that provides effective elimination of such surface defects as cracking, rutting, stripping, raveling, and bleeding including defects caused by the non-conformity of asphalt concrete to the standard specifications. The HIR technologies are divided into four methods: «Reshape», «Repave», «Remix», and «Remix Plus». Among those methods, «Remix» and «Remix Plus» are more complicated technologically and are connected with changing the composition of existed (old) asphalt concrete. The composition of existed asphalt concrete should be corrected through the addition some of new components (aggregates, asphalt binder, rejuvenating agent, or new hot-mixed asphalt concrete mixture) to the hot-milled old asphalt layer.
This article is dedicated to the methods of calculation of new and recycled aggregate mixture gradation regarding to the Ukrainian standards. The proposed methods of calculation consider such main peculiarities of HIR-recycled materials and layer design as: 1) old asphalt concrete, particularly its aggregate parts, can used in a non-fractioned form only; 2) HIR-recycled asphalt concrete layer should be designed with or without the maximal layer thickness restriction. The proposed methods also give the possibility to correct the technological process if the calculated amount of new material necessitated to the correction of old asphalt concrete aggregate grading does not allow to maintain the projected layer thickness.
The implementation of the proposed technique of calculation of aggregate grading with and without restriction of the maximal thickness of recycled asphalt concrete layer allows enhance quality of recycled materials and promotes the entire adaptation of HIR technologies to the Ukrainian standards.
Keywords: hot in-place recycling of asphalt concrete, «Remix», «Remix Plus», recycled asphalt concrete mixture, correction of aggregate gradation.

REFERENCES
1. V., Zhdanyuk, D., Sy`bil`sky`j (ed) (2006) Vsesvitnya dorozhnya asociaciya. Texnichny`j komitet S7/8 «Dorozhni pokry`ttya». Recy`klyuvannya dorozhnix odyagiv [World Road Association. Technical Committee С7 / 8 “Road cover”. Recycling of road clothes]. Kharkiv: KHNADU, 52 p.
2. Tereshhenko, T. A. (2017) Aspekty` uspishnogo vprovadzhennya promy`slovogo resajklingu dorozhn`ogo asfal`tobetonu [Aspects of the successful implementation of industrial road reclamation road asphalt concrete]. «Roads and Bridges» Digest, vol. 17, pp. 5–13.
3. Naukova rada Ukravtodoru (2014) Rekomendaciyi z vidnovlennya znosheny`x shariv asfal`tobetonnogo pokry`ttya za texnologiyeyu garyachogo resajklingu na dorozi. Р В.3.2-03450778-837:2014 [Recommendations for the restoration of worn-out layers of asphalt concrete coating on the technology of hot recaikeling on the road. Р В.3.2-03450778-837:2014]. Oficijny`j dokument derzhavnogo agentstva avtomobil`ny`x dorig Ukrayiny` [Official document of the State Agency of Motor Roads of Ukraine], no. 2, 28 p.
4. Naukova rada Ukravtodoru (2014) Ty`pova texnologichna karta na vy`konannya robit z vidnovlennya znosheny`x shariv asfal`tobetonnogo pokry`ttya za texnologiyeyu garyachogo resajklingu na dorozi metodom «Remiks». ТТК 37641918/03450778-174:2014 [A typical technological map for the implementation of works on the restoration of worn-out layers of asphalt concrete coatings on the technology of hot recaikeling on the road by the method of «Remix». ТТК 37641918/03450778-174:2014]. Oficijny`j dokument derzhavnogo agentstva avtomobil`ny`x dorig Ukrayiny` [Official document of the State Agency of Motor Roads of Ukraine], no. 2.
5. Stroup-Gardiner, M. Transportation Research Board (TRB) (2011) A Synthesis of Highway Practice: Recycling and Reclamation of Asphalt Pavements Using In-Place Methods National Cooperative Highway Research Program (NCHRP) Synthesis 421. Washington, D.C., 70 p. Available at: http://www.trb.org. DOI: https://doi.org/10.17226/14568
6. Imran, Hafeez, Hasan, Ozer, and Imad, L. Al-Qadi (2014) Performance Characterization of Hot In-Place Recycled Asphalt Mixtures. Journ. of Transportation Engineering, vol. 140, no. 8, 9 p. DOI: https://doi.org/10.1061/(ASCE)TE.1943-5436.0000679
7. Ben C., Cox, Isaac L., Howard, and Alex, Middleton (2016) Case Study of High-Traffic In-Place Recycling on U.S. Highway 49: Multiyear Performance Assessment. Journ. of Transportation Engineering, vol. 142, no. 12, 12 p. DOI: https://doi.org/10.1061/(ASCE)TE.1943-5436.0000900
8. Naukova rada Ukravtodoru (2017) Rekomendaciyi z pidboru skladu ta zastosuvannya bitumomineral`ny`x sumishej z vy`kory`stannyam asfal`tobetonnoyi kry`xty`. Р В.2.7-37641918-887:2017 [Recommendations on the selection and application of bituminous mixtures using asphalt concrete crumb. Р В.2.7-37641918-887:2017]. Oficijny`j dokument derzhavnogo agentstva avtomobil`ny`x dorig Ukrayiny`[Official document of the State Agency of Motor Roads of Ukraine], no. 1, 40 p.
9. P., Kandhal, R., Mallick (1997) Pavement Recycling Guidelines for State and Local Governments. Chapter 10: Hot In-Place Recycling (Materials and Mix Design). US Department of Transportation, Federal Highway Administration; Research, Development, and Technology. Available at: http://www.fhwa.dot.gov
10. Ministry of Regional Development, Construction and Housing and Communal Services of Ukraine (2012) Sumishi asfal`tobetonni ta asfal`tobeton dorozhnij ta aerodromny`j. Texnichni umovy` : DSTU B V.2.7-119:2011. Nacional`ny`j standart Ukrayiny` [Mixtures of asphaltic concrete and asphalt concrete road and airfield. Specifications: DSTU B V.2.7-119: 2011. National standard of Ukraine]. Kyiv, Ministry of Regional Development, Construction and Housing and Communal Services of Ukraine, 45 p. DOI: https://doi.org/10.32402/dovkil2019.01.061
11. Naukova rada Ukravtodoru (2011) Rekomendaciyi shhodo vy`znachennya tovshhy`ny` konstrukty`vny`x shariv isnuyuchogo dorozhn`ogo odyagu. Р В 2.3-218-02071168-781:2011 [Recommendations for determining the thickness of the constructive layers of existing road clothing. Р В 2.3-218-02071168-781:2011]. Oficijny`j dokument derzhavnogo agentstva avtomobil`ny`x dorig Ukrayiny` [Official document of the State Agency of Motor Roads of Ukraine].