Environmental approaches in the asphalt industry have focused on utilizing waste materials as modifiers. Lignin is a high-potential bitumen modifier due to its characteristics; however, blending process with critical. This study investigates chemo-thermal characteristics of lignin-modified under two different protocols, including mechanical and high-shear mixer evaluate performance modifier. Ac...

The objective of this research was to develop prediction models for complex shear modulus (G*) and phase angle (δ) bitumens modified with crumb rubber, styrene-butadiene styrene, polyphosphoric acid at low moderate temperatures. experiments consisted three different dosages each modifier added the original bitumen followed by measurement G* δ using dynamic rheometer (DSR) test in frequency swee...

1190 www.thelancet.com/oncology Vol 12 December 2011 In October, 2011, 16 experts from nine countries met at the International Agency for Research on Cancer (IARC) in Lyon, France, to reassess the carcinogenicity of bitumens and their emissions, and of some N-heterocyclic and S-heterocyclic polycyclic aromatic hydrocarbons (PAHs). These assessments will be published as Volume 103 of the IARC Mo...

We apply a cubic-plus-association equation of state to study the asphaltene precipitation from n-alkane diluted model solutions (asphalteneþtoluene), and heavy oils and bitumens. Heavy oils and bitumens are characterized in terms of saturates, aromatics/resins, and asphaltenes; n-alkanes are treated independently. The asphaltene precipitation is modeled as liquid-liquid phase equilibrium. The s...

As a very important coating material in different applications, bitumen is a complex mixture of different chemicals. It is generally accepted that the principle of time-temperature superposition (TTS) holds for this material. In this study rheological measurements were carried out on four different bitumens. Different representations of the experimental data were examined to check failure or ho...

© Appl. Rheol. 20 (2010) 63293 DOI: 10.3933/ApplRheol-20-63293 Abstract: Bitumen is undoubtedly the most important material in the construction and rehabilitation of flexible road pavements. By increasing the temperature, bitumen changes from brittle solid, to viscoelastic solid and finally to Newtonian fluid. The rheological characteristics of bitumen also vary greatly due to aging, which is a...

Abstract Lignin is one of major by-product from wood and paper industry. As natural biopolymer, it could be a valid alternative as bitumen replacement and/or modifier to enhance the relevant performance asphalt mixtures, promoting concurrently environmental benefits. In this context, study focused on effects two different binders containing 30% lignin (by weight) mechanical properties bio-aspha...

the neat bitumen, an oil refining by-product, has its own inherent weakness under long-time loading at low and high temperatures. these performance limitations of neat bitumen have led researchers to modify its physical andmechanical properties. according to several studies, polymers can be used to modify the properties of bitumen. due to much lower production costs and aiming to reduce environ...