OBJECTIVES The study investigated the utility of unmetabolised naphthalene (Nap) and phenanthrene (Phe) in urine as surrogates for exposures to mixtures of polycyclic aromatic hydrocarbons (PAHs). METHODS The report included workers exposed to diesel exhausts (low PAH exposure level, n = 39) as well as those exposed to emissions from asphalt (medium PAH exposure level, n = 26) and coke ovens ...

This paper attempts to analyze the effect of mineral powder on adhesion aggregates and asphalt. First, it employs gravimetric method quantitatively peeling rate asphalt mortar from surface basalt, andesite, limestone aggregates. Then, takes microscopic pictures adhered observe distribution in mixtures, uses profiles status At last, this analyzes particles surface/interface asphalt, results indi...

The primary objective of this research is to evaluate the feasibility of several WMA mixtures as potential asphalt paving mixtures for Nebraska pavements. To that end, three well-known WMA additives (i.e., Sasobit, Evotherm, and Advera synthetic zeolite) were evaluated. For a more realistic evaluation of the WMA approaches, trial pavement sections of the WMA mixtures and their HMA counterparts ...

This review paper shows several sections of bitumen, asphalt mixtures, polymers, and waste plastic in pavement engineering. The reviews evaluates the influence using polymer improving rheological engineering properties modified binder mixtures. Evaluation design stone mastic mixtures are reviewed. Reports studies had investigated advantages importance bitumen modification; however, they yet sho...

Issues like limitation of natural resources aggregates, global warming, need for eco-friendly, cost-effective, and high performance durable asphalt mixture, have made the Reclaimed Asphalt Pavements Warm Mix (RAP-WMA) Steel Slag (SS-WMA) interesting substitutions conventional Hot mixtures. Furthermore, presence moisture initiates accelerates deterioration both these In this way, response RAP-WM...

This paper aims to determine the Marshall properties of Asphalt Concrete-Wearing Course (AC-WC) and Hot Rolled Sheet-Wearing (HRS-WC) with utilization concrete waste also percentage added into AC-WC HRS-WC as substitute for coarse aggregates. During manufacture asphalt mixtures, aggregates, fine aggregates are required in large quantities. To reduce fresh mixtures road pavement, has become an a...

Research on waste tire pyrolysis carbon black (PCB) in bitumen mixtures indicates that it has excellent high-temperature rutting resistance; however, the degradation of low-temperature crack resistance and water stability PCB-modified asphalt limits its wide application. Therefore, hot-mix (HMA) were enhanced by addition chicken feather (WCF). Based response surface methodology (RSM), a varianc...

In recent years, the use of crumb rubber as modifier or additive within asphalt concretes has allowed obtaining mixtures able to bind high performances to recovery and reuse of discarded tires. To date, the common technologies that permit the reuse of rubber powder are the wet and dry ones. In this paper, a dry-hybrid technology for the production of Stone Mastic Asphalt mixtures is proposed. I...

For the concerns of investigating viscoelastic properties recycled asphalt mixtures incorporating high content reclaimed styrene-butadiene-styrene (SBS) modified pavement (RAP-SBS), mixture performance tester (AMPT) was applied to analyze dynamic modulus and phase angle by influence RAP-SBS content, temperature, loading frequency, long-term aging (LOTA), incorporation a rejuvenating agent. Mast...