Search

This paper considers the effect of aging processes on viscoelastic characteristics of vacuum residue oxidation products modified with crumb rubber. Viscoelastic properties were compared to original bitumen raw material-vacuum residue and vacuum residue oxidation products during short-term and long-term aging. The complex shear modulus of the vacuum residue and its oxidation products decreased with an increase in temperature. Short-term aging resulted in increased shear modulus for all samples.The vacuum residue oxidation product modified with crumb rubber had the maximum values of the rutting parameter and fatigue parameter. There was an expansion of the temperature range of plasticity: for the vacuum residue oxidation product with crumb rubber, its value was 67.2 °C. The curves of the black diagram of the modified vacuum residue oxidation product are shifted towards smaller phase angles with the increase in the shear modulus, which indicates the increase in the stiffness and elasticity of the rubber bitumen binders. The vacuum residue oxidation product modified with crumb rubber corresponded to the rubber bitumen binder of the grade RBB 60/90, according to its physical and mechanical indicators. [ABSTRACT FROM AUTHOR]

In the paper, obtaining carbon materials from crumb rubber are presented. The process were carried out at 300-400°C by thermal processing (carbonization) method under the inert gas. During carbonization, the percentage of weight loss of samples and their surface area were determined. During the carbonization of rubber crumbs at a temperature of 300 °C from the first 14.82 g of carbon material was obtained and the weight change was 25.9 %. According to increase temperature, the products were decreased. As well as at the temprature 390 °C, the product mass droped to 9.84g and mass changing increased to 51.8%. The result of the electron microscopic analysis of rubber crumb from worn automobile tires, shows that it has heteros tructures with only very small pores. It is established that the spectrum of carbon materials obtained by carbonization with IR spectroscopy has functional groups according to activated carbon's functional groups. The specific surfacearea of the carbon material obtained by carbonization at 300 °C was 2.096 m2/g. At a temperature of 350 °C reaches a maximum value (5,409 m2/g). It shows that the effective carbonization temperature of rubber crumbs is 350 °C. [ABSTRACT FROM AUTHOR]