No abstract

This article presents an investigation about the polymer-modified bitumens (PMBs) containing styrene-butadiene-styrene (SBS) block copolymers with different structures, linear (SBS-L) and radial (SBS-R), semicrystalline copolymer ethylene-vinyl acetate (EVA), and terpolymer ethylene-butyl acrylate-glycidyl methacrylate, Elvaloy AM and Elvaloy 4170. The aim of the study was to establish the influence of the polymer type and content on the properties of PMBs for engineering applications and to evaluate the effectiveness of polymer modifiers. The results indicated that the polymer modification improved the rheological properties of bitumen, increased critical temperature, that is better resistance to permanent deformation was achieved as well as a wider temperature range in service. The degree of improvement generally increased with the polymer content but varied with the polymer type.

No abstract

The influence of the age of onset of CH is intriguing for further studies and could possibly extend the knowledge about CH pathophysiology. From a clinical point of view, the differences in CH presentation are insufficient to preclude a correct diagnosis and treatment because the same criteria could be applied regardless of patient age.

Polymers are commonly used to improve the properties of bitumen (BIT) as a binder for asphalt. Polymers improve the temperature susceptibility of BIT by increasing its stiffness at high service temperatures and by reducing its stiffness at low service temperatures. The addition of polymers as BIT modifiers contributes to the BIT viscoelasticity. The aim of this article was to study the effect of the addition of ethylene vinyl acetate (EVA) copolymer on the morphology, rheological, and physical properties before and after aging. The influence of EVA contents on rheological and physical properties which are included in conventional tests before and after aging was investigated. The results indicated that the rheological and physical properties as well as the morphology of polymer‐modified bitumen (PMB) depended on the polymer content. The rheological properties of road BIT were improved by means of EVA polymer modification as proven by conventional tests, the rheological parameters G*, η*, δ, and resistance to permanent deformation, that is, rutting. POLYM. ENG. SCI., 53:2276–2283, 2013. © 2013 Society of Plastics Engineers