To investigate the effect of pre-shredding as a replacement for high-speed shearing in preparation process SBS-modified asphalt, particle size and mixing time pre-shredded SBS modifier were studied. Laser confocal microscopy was used to observe morphological changes dispersion state during process, parameters determined through rheological performance tests. FTIR tests conducted on original asp...

Through a simple performance dynamic modulus test (SPT), standard rutting test, Hamburg French and asphalt pavement analyzer the resistance of mixtures in middle lower courses three semi-rigid base Beijing full-scale track road China was evaluated. The results show that can be greatly improved by using low-grade asphalt, especially 30# asphalt. SBS modified is also better. SPT indirectly charac...

Permeability of an asphalt pavement is one of the most important parameters that have a direct influence on its design life. It is an intrinsic property that relates the average fluid velocity to a constant pressure gradient; however, the external pressures on a saturated pavement pore structure are often dynamic due to the repeated tire loading in the field. A dynamic permeability constant, th...

This study explores the effects of polyphosphoric acid (PPA) on rheological performance styrene butadiene (SBS) and crumb rubber (CR) modified asphalt binders at high temperatures. Four PPA concentrations were selected: 0.4%, 0.8%, 1.2%, 1.6% by weight virgin asphalt, one SBS binder with 5% was used as a reference binder. Laboratory tests performed to simulate short-term long-term aging. Temper...

With the rapid growth of traffic demands, use liquid chemical material instead traditional modifier to prepare high-performance modified asphalt demonstrates dual values in environmental protection and performance improvement pavement. The objective this study is assess efficiency reveal modification mechanism using a developed polyurethane precursor–based reactive (PRM) preparation precursor–m...

this paper is a state-of-the-art in sulphur-asphalt (sa) design technology based on a comprehensive analysis of current practice and technical literature, in order to investigate the possible use of sa pavements in iran. in this paper, the major aspects(material, technology, properties, production, placement, quality assurance, design, and field varification) of sa pavements are considered. fer...

An optimal scheme of road paving maintenance was investigated by examining the environmental loading and cost considerations of pavement operations over a 30-year life cycle. Results indicated that the application of recycled materials in pavement construction and repair reduced the effects of environmental loading over the life cycle by approximately 40%. Furthermore, it was observed that envi...

This chapter describes the methodology used in EPA’s Waste Reduction Model (WARM) to estimate streamlined life‐cycle greenhouse gas (GHG) emission factors for asphalt shingles beginning at the waste generation reference point. The WARM GHG emission factors are used to compare the net emissions associated with asphalt shingles in the following four waste management alternatives: source reduction...

Semi-flexible pavement has been widely used in China's road construction due to its excellent rutting resistance. Due the large difference volume stability between matrix asphalt mixture and cement mortar, internal stress of semi-flexible material is concentrated cracking likely occur. To explore influence different Influencing factors on resistance materials. This paper orthogonal design metho...