The ageing of the bitumen during storage, mixing, transport and laying on the road, as well as in service life, are the most important problems presented by the use of bitumen in pavements. This paper investigates the possibility of using waste cooking oil (WCO), which is a waste material that pollutes landfills and rivers, as an alternative natural rejuvenating agent for aged bitumen to a cond...

In this study, halloysite and sepiolite nanoclays were used to reinforce SBS modified bitumens. The are different from the materials in literature have properties such as easy find, economical available local sources. mixing parameters determined before production process. polymer additive was added into base bitumen at 3% 5%, nanoclay additives 2% 4% ratios. morphological structures investigat...

in this article, the crystallization of polyethylene is investigated by the modified weighted density approximation. also, a direct correlation function of polyethylene based on the rism theory is used. the free energy of a polyethylene is calculated using the density functional theory. the crystallization and also the solid and liquid densities of polyethylene are calculated and compared with ...

bituminous emulsion insulators are types of bituminous emulsions groups composed of different grades of bitumen emulsified in water by bentonite and emulsifiers at 80-90oc. these emulsions are water resistant after drying andtheir physical and mechanical properties are superior in comparison to bitumen properties. iranian climate, because of variety and extreme variations in temperature imposes...

Stone matrix asphalt (SMA) mixtures are one of the most resistant types known to date that bulk load is borne by aggregate skeleton. In this research, effect crumb rubber powder (CRP), Vestenamer polymer, and warm additives, including Sasobit, ZycoTherm, a porous mix (PAWMA), was investigated on moisture resistance SMA mixtures. A segregation test performed determine tendency polymer separate f...

In recent decades, porous asphalt has been extended for surface drainage in various regions throughout the world. The permeability of porous asphalt has an important role in the performance of asphalt pavements in the rainy weather. The most remarkable problem related to the porous asphalt is its short service time. Considerable efforts have been made to enhance the mechanical properties of por...

Conventional hot mix plants operate to support large paving projects, making production more economic with high volume output. When repairs and maintenance are needed, it can be challenging maintain small quantities of bituminous mixtures at a sufficient temperature, especially in the case winter maintenance. Consequently, repair materials cannot compacted desired level on some occasions. This ...

The article provides information on the physical and mechanical properties of polymer-bitumen compositions obtained by modifying road bitumen BND 50/70 with elastomers SKEPT-60 SKN-26 determination composites. composite samples various concentrations (2.5, 3.0, 5.0%, 6.5 7.0%) were determined: needle depth, softening, brittleness flash point, stretching adhesion. It was determined that characte...