BACKGROUND Controversy exists as to the potential of asphalt fumes to induce respiratory symptoms and lung functional impairments. OBJECTIVE To examine the respiratory effects, if any, of occupational inhalation exposure to asphalt fumes. METHODS In this cross-sectional study, 74 asphalt workers and 110 unexposed employees were investigated. The prevalence of respiratory symptoms among subj...

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...

Porous asphalt (PA) mixtures are more environmentally friendly but have lower durability than dense-graded mixtures. Additives can be incorporated into PA to enhance their mechanical strength; however, they may compromise the hydraulic characteristics, increase total cost of pavement, and negatively affect environment. In this paper, were produced with 5 different types additives including 4 fi...

The photodegradation behavior of a straight asphalt was investigated using a new method “photodegradation test of asphalt binder using pressed thin film samples”. Although the photodegradation caused by outdoor exposure is limited to the near surface, the results confirmed that the degree of degradation during 1 to 2 months is more severe than that by the pressure aging vessel (PAV) test, which...

The Asphalt Pavement Technology Program is an integrated, national effort to improve the long‐term performance and cost effectiveness of asphalt pavements. Managed by the Federal Highway Administration through partnerships with State highway agencies, Industry and academia the program’s primary goals are to reduce congestion, improve safety, and foster technology innovation. The program was est...

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...

This study aimed to determine how various concentrations of warm mix asphalt (WMA) additives can affect the rheological and physical characteristics cement. Bitumen was modified by chemical additive PAWMA® with an addition ratio (0.2, 0.4, 0.6), while organic additives, Sasobit® Kaowax®, were added at (2, 4, 6%) weight bitumen. hardness, softness, temperature susceptibility, viscosity, elastic ...

Preliminary particle size specifications have been developed on Cationic Slow Set (CSS) and Medium (CMS) emulsions. Therefore, there is a need for standard specification asphalt emulsions that encompass Rapid (CRS) with additives such as solid polymer latex polymer. This research links metrics to quality-control tests performance test CRS-2, CRS-2P, CRS-2L The moderate correlation between stora...

Environment conservation and diminishing natural resources caused an increase in popularity of the application of renewable bio-origin resources for the construction of road pavement. Currently, there are known additions of bio-origin materials for bitumen modification. Such material is also used as a flux additive for bitumen or as a rejuvenator once working with reclaimed asphalt pavement (RA...

Significant public procurement changes are forcing road construction companies to professionalise planning and control of asphalt paving projects. In an effort to outperform competitors, companies seek better control over the paving process, over the planning and scheduling of resources and work, and over performance. For the asphalt paving companies to be able to improve product and process pe...