Research of Influence of Sand-Gravel Mix Components on Strengthening of Forest Roads by Crude Oil

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UDС

625.814.3

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Abstract

Nowadays the construction of the forest roads has considerable influence on the industrial development of frontier areas of the Arkhangelsk region. They organically fit into the general transport network, despite their limited application. For the purpose of the improvement of the operational characteristics in structures of the forest roads they apply the stone materials strengthened by various substances, such as bitumen, oil, portland сement, lime, etc. Studying the influence of the compound components of road-building materials at their strengthening is the important direction in the forest transport branch of the scientific knowledge. This paper presents the research results of the granulometric composition of oiled gravel mixture (hereinafter OGM) and sand-gravel mixture (hereinafter SGM), which are usually used at the forest road surfaces. At the experiments the convergence of curves of grain composition OGM and SGM no. 2 was determined. The graphical method of analysis revealed the discrepancies of the samples SGM taken directly from the road surface and career to the statutory requirements for mixtures. In addition, the study of the component composition OGM by the burning method the number of binders was determined, with the content of 4,3 % of the stone material. Using the electron microscopy techniques the surface structures of binding materials such as oil and bitumen, which are often used to increase the carrying capacity of forest roads coatings, were investigated. And the significant structural differences between these materials were revealed. The structural and group analysis of oil and bitumen were conducted to determine the amount of asphaltene, oleoresin and paraffin. The experiments established that the bitumen content in these hydrocarbon groups exceeds 10, 2 and 1,5 times than that of oil, respectively. The share of these substances in the bitumen was taken into account almost completely, unlike oil, 61.89 % of which is not defined. Therefore, it is appropriate to use jointly crude oil and bitumen in response the existence of amount of asphaltene and paraffin in the road bitumen and the existence of hydrocarbonic families of the light and superlight fractions in oil. In order to reduce the interfacial bitumen transition from one state of aggregation to another it was decided to use the bitumen in the form of finely-divided material - bituminous powder. The images of the structure of the bitumen powder was obtained with the help of the optical microscopy.

Authors

F.A. Pavlov1, Candidate of Engineering, Professor, M.A. Melnitsky1, Postgraduate Student L.N. Golitsin2, General Director

Affiliation

1Northern (Arctic) Federal University named after M.V. Lomonosov2Dorinzhservis ltd ::: 1 Naberezhnaya Severnoy Dviny, 17, Arkhangelsk, 163002, Russia; e-mail: promtrans@agtu.ru 2, P.Usova str., 10, Arkhangelsk, 163002, Russia; tel. +7-911-56-20-425

Keywords

forest roads, grain structure, sand-gravel mix, bituminous powder, oil, structure.

References

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