Asphalt modification/reinforcement has received considerable attention as viable solutions to enhance flexible pavement performance. This is mainly prompted by the unsatisfactory performance of traditional road materials exposed to dramatic increases and changes in traffic patterns. This paper presents the evaluation of fatigue behaviour of nano reinforced Stone Mastic Asphalt mixtures. Fatigue...

There is a need to develop simple and quick non-destructive tests to measure the complex dynamic modulus of asphalt over a wide frequency and temperature range, i.e. mastercurve. In this study results from free-free resonant frequency measurements on cylindrical disk shaped asphalt samples are presented. The resulting mastercurve, obtained by resonant frequency testing at different temperatures...

High-modulus asphalt mixes are effective means to solve rutting problems, but they perform poorly at low temperatures. This study aims enhance the modulus and low-temperature properties of mixes. Firstly, composite-modified asphalts were prepared by incorporating rubber powder rock asphalt. Secondly, their mechanical viscoelastic investigated determine appropriate mass ratios in be 20% 6%, resp...

In order to study the micro-aging mechanism of lignin-modified asphalt, different asphalt samples were prepared with lignin content 0% and 12% by mass. The conventional index test high-temperature dynamic shear rheological used analyze samples. change law performance modified thermal oxygen aging time. results show that adding appropriate amount each will increase penetration ductility base red...

Rubblization is one of the surface preparation techniques before placing a Hot Mix Asphalt (HMA) overlay that involves breaking the Portland Cement Concrete (PCC) pavement into pieces. This paper describes the structural assessment related to the long term performance of rubblized concrete pavements in Iowa. The structural performance of seven representative in-service rubblized concrete paveme...

In order to study the effect of UV aging on asphalt performance, four-component test, dynamic shear rheology and flexural creep stiffness test were combined with molecular dynamics simulation matrix rubber powder/styrene-butadiene rubber/polymerization. The properties phosphoric acid/epoxy resin modified before after analyzed, mechanism was discussed. Research shows that has better high low tem...

This doctoral thesis consists of a literature review, presented in two papers, and another six papers describing experimental studies of the influence of different kinds of wax and polyphosporic acid on bitumen and asphalt concrete mixture properties. The literature review should give an extensive description of the field of knowledge concerning wax in bitumen. Effects of wax in crude oil, bitu...