This study reports the simulation of a photocatalytic system process and the photocatalytic property of self-cleaning asphalt concrete (SCAC) with four typical asphalt mixtures. A photocatalytic system was simulated based on the pollutant concentration data, which were collected on three types of city roads. Two photocatalytic indexes were proposed to evaluate the photocatalytic property of sel...

This project documents the impact of a porous asphalt overlay on the quality of highway stormwater runoff. A porous asphalt overlay, also known as a permeable friction course (PFC) or open graded friction course (OGFC), is a layer of porous asphalt approximately 50 mm thick which is often applied on top of conventional asphalt highways to enhance safety and reduce noise. The quality of stormwat...

The public, industry, and governments have become increasingly interested in green design and sustainable development. Construction activities affect the environment significantly, so environmental issues should be considered seriously. Thousands of miles of roads are paved every year with asphalt and steel-reinforced concrete. What are the environmental effects of the two materials? If asphalt...

Limited studies in recent years have shown that asphalt pavement subject to seawater in coastal regions or deicing salt in cold regions may be seriously damaged after being soaked in saline water for a long time. However, there is limited research into the influence of salt on rheological properties of asphalt after long-term aging. In this study, rheological properties of unmodified and polyme...

In order to produce high-viscosity and high-toughness asphalt for ultra-thin overlays, the conventional cement was modified with high-content SBS micro carbon fiber (MCF). The performances of were studied by tests penetration, softening point, ductility, kinematic viscosity, multiple stress creep recovery (MSCR), dynamic shear rheometer (DSR) bending beam (BBR). Mixture properties rutting, low-...

Ultraviolet radiation is the main cause of degradation in asphalt pavement. To improve performance pavement used strong ultraviolet (UV) region western plateau, China, this study explores effects adding nano-montmorillonite and carbon black to SBS-modified asphalt. Through conventional index detection, dynamic shear rheological tests, low-temperature bending creep UV aging high- performance, fa...

Asphalt aging is one of the main causes asphalt pavement cracking, loosening and other issues. On a macro level, hardens becomes more brittle, while on micro chemical composition molecular weight distribution change. This very complicated physicochemical process. Gel permeation chromatography (GPC) powerful technical tool for understanding mechanism expressing GPC can be used to measure content...

Biomass heavy oil is employed to partially substitute the petroleum-based asphalt due its renewability, environmentally friendly, and cost-effective advantages. However, usage weakens high-temperature performance of petroleum asphalt. Therefore, nano-ZnO was as a modifier make composite-modified improve in this paper. It prepared two steps: first, bio-asphalt by adding biomass based on certain ...

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 sub...

Cohesion properties of the binder matrix within asphalt mixes and adhesion characteristics of the asphalt binder and aggregate particles are the two major mechanisms resisting against cracking in asphalt mixes. This study is focused on estimating crack resistance of asphalt mixes at intermediate temperatures through evaluation of cohesion and adhesion properties of binder-aggregate systems usin...