this paper identifies eleven types of asphalt pavement distress types, commonly occuring in tehran metropolitan area. of these, five distresses namely: corrugation; utility cut depression ;pot holes; alligator cracking; and loss of bridge deck surfacing are rather common. however, others namely: shear failure; shrinkage cracks; lane joint cracks; bleeding; and shoulder distress are less prevail...

Using nano-technology materials in the asphalt pavement industry is new compared with Portland cement concrete. The main objective of this study is to investigate the effects of nano-silica modification on some properties of a penetration grade asphalt cement and a typical asphalt concrete. 60/70 penetration grade bitumen was modified with different percentages of nano-silica (i.e. 1, 3 and 5%,...

This article is dedicated to the development of a joint filler for cracks in asphalt concrete pavement, as well expansion joints cement pavement. The presents choice unified units and unit being developed pavement Some methods calculating main parameters created are presented. In addition, suitable prototype filler, were selected from several types.

creep compliance is one of the fundamental tests of mechanistic- empirical flexible pavement design procedure in the aashto 2002 design guide. in this research, a new artificial neural network model for estimating the hma creep compliance with the generalization ability of r=0.949 has been developed successfully using feed forward multi layer perceptron artificial neural networks (anns) with le...

Asphalt fiber synchronous surface dressing has good stress absorption and dispersion ability. It a network winding structure, which can effectively absorb, diffuse redistribute the local concentrated in pavement reduce structure. reduces generation of cracks structure layer, prevents suppresses occurrence reflection cracks. For three consecutive years, Qingyang highway development center Gansu ...

The application of asphalt hot mix recycling is one challenge in sustainable road pavement research. In addition to the vast amount research on performance recycled asphalt–concrete, frictional resistance still limited. effects aged and aggregates skid were investigated this carefully extracted from field-reclaimed pavement, engineering mechanical properties virgin measured. degradation was sim...

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...

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 ...

Assessment of pavement distresses is one of the important parts of pavement management systems to adopt the most effective road maintenance strategy. In the last decade, extensive studies have been done to develop automated systems for pavement distress processing based on machine vision techniques. One of the most important structural components of computer vision is the feature extraction met...

Many rural highways in Atlantic Canada are in poor condition due to limited maintenance funding available. The typical maintenance strategy has been to place an overlay on the damaged asphalt concrete layer to provide a new wearing surface, but this approach does not repair the damage embedded within the pavement structure. After a certain period of time, the original cracks reflect through the...