Low Temperature Resistance Increase for Bitumen by Compounding with Tar

Bagdat Teltayev,Yerik Amirbayev,Sakhypzhamal Begaliyeva,Cesare Oliviero Rossi,Tulegen Seilkhanov

doi:10.3390/app11188579

Bagdat Teltayev, Yerik Amirbayev + Show 3 more

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https://doi.org/10.3390/app11188579

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Abstract

In this paper, a conventional road bitumen with penetration grade 100–130 is compounded with tar in order to obtain bitumen with improved low temperature resistance. The low temperature (at −24 °C, −30 °C and −36 °C) resistance of the virgin bitumen and the compounded one is evaluated by testing on a bending beam rheometer. It was found that the optimum compounding (20% of tar by weight) decreases the stiffness essentially (from 18% to 34%), i.e., it increases the low temperature resistance of the bitumen. The stiffness decreases in the compounded bitumen can be explained by quantitative variations in its group chemical composition and molecular fragments. Group chemical composition has been determined by the method of absorption chromatography, and the fragments of molecules are identified by NMR-spectroscopy.

Highlights

IntroductionIt is known that the operational characteristics of road asphalt concretes are mostly determined by the properties of bitumen [1,2,3,4,5].More strict requirements are specified relative to the properties of the bitumen used in sharp continental climatic conditions [6,7]
Optimal compounding of the bitumen with the tar (20% by weight) changes significantly its group chemical composition: asphaltenes and resins decreased by 23%
The results of investigations performed in the paper have shown practical possibility for obtaining bitumen of less viscous consistency (P25 = 170 0.1 mm) by compounding bitumen with penetration grade 100–130 (P25 = 116 0.1 mm) with tar in the amount of 20% by weight

Summary

Introduction

It is known that the operational characteristics of road asphalt concretes are mostly determined by the properties of bitumen [1,2,3,4,5].More strict requirements are specified relative to the properties of the bitumen used in sharp continental climatic conditions [6,7]. In such climatic conditions, the asphalt concrete with bitumen should have sufficient resistance to the rutting under numerous repeated impact of heavy trucks in a hot summer season and to low temperature cracking at sharp, continuous and cyclic cooling in a cold winter season

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