Asphalt pavement rut influences the durability of as well traffic safety. The influence a flexible and semi-rigid base on asphalt has not been researched in detail. Using theoretical experimental research rut, objective this project is to determine differences for different types pavement's performance. details include an analysis conditions using ABAQUS FEA software, indoor test, actual engineering data. For surface base(Surface means total deformation layer base.), less than pavement, but...

The anti-aging performance/durability of an asphalt mixture is important technical performance indicator pavement. Although hybrid-modified mixtures have better high- and low-temperature performances than other mixtures, the durability has received little attention. Therefore, influencing factors affecting are investigated in this study changes mechanical aged as a result determined. results show that highest for 4% styrene butadiene (SBS)/15% rubber powder followed by SBS/3% (SBR) SBR/15%...

A grading curve is an important measure for illustrating the grain size distribution of granular materials. In general, there exists a statistical fractal relationship between cumulative number particles and materials in nature. The objective this paper to calculate dimensions different types curves common are classified into four categories: concave, convex, combinational, gapped. formulas concave convex derived from same relation. can then be obtained known by linear fitting approach. For...

In order to improve the structural condition assessment standards of asphalt pavement and concrete beam bridges, a new road bridge composite evaluation index (RBCEI) parameter was proposed evaluate pavements girder bridges. The correlations between strength indexes conditions are established in this research. results indicate that evaluating lower than those conditions. Through comprehensive analysis RBCEI conditions, technical departments highway operations maintenance divisions should pay...

The determination of traffic volume in asphalt pavement design has not considered the effects seasonal variability on vehicle axle loads China. By analyzing variation loads, formulas for conversion modified load to have been derived and presented, accordance with specifications This study includes following: derivation converting volume, classification 3 different seasons, distribution influencing coefficients, application formulas, among others. comparison results between unmodified applied...

Purpose In order to determine the range of medium temperature zone road asphalt, it is hoped that evolution viscoelastic characteristics asphalt under state can be deeply explored. Design/methodology/approach this paper, needle penetration test and scanning were designed for 90# 70# bitumen as materials, boundary was accurately determined by data analysis method. A mathematical model established based on principal component analysis, a comprehensive evaluation index proposed evaluate means...

Traditional penetration indices cannot accurately evaluate the performance of asphalt binders at high and low temperatures. A study was therefore undertaken to determine temperature conversion formulae for designing pavements using US Strategic Highway Research Program's Superpave grading (PG) method. The research involved observation climate pavement temperatures in north-east China, determination classification climatic zones PG standards. results this showed that proposed are more...

The pavement engineering properties of typical weathered granite material and cement stabilized in coastal areas Shandong Province was analyzed through indoor test. results show that has favorable grain composition compaction property. compacted granited meets the strength requirements subgrade for heavy traffic highway. According to geological distribution granites Weihai City could be divided into Proterozoic era partition Mesozoic partition. addition coarse aggregate have a significantly...

Porous asphalt pavements are subjected to a combination of traffic loads and environmental factors during the service phase, internal structure mixture changes. The influence evolution porous mixes on heat transfer function is not known. purpose this study analyze from meso-level. In study, image processing software was used cross-section Marshall specimens. coarse aggregates, voids mortar inside were distinguished establish finite element model mixture. change law conduction mix before...

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