In the last few years asphalt grids and nets have been used in enormous amount in hungarian road construction, without any overall laboratory researches. In this article, we want to clarify conceptual confusions about grids and nets, define the repairing and -in some cases-damaging effect of grid usage. The biggest question in fortification of pavement, is the possibility of mixure of grid and net with the apshalt layer below. To observe these attributes we used the methode used at bridge lining: slide methode. Small and large wheel observations have been made to research track appearances in fortified construction. The lifetime of the construction have been observed by a fatigue methode: the standard four point bending methode. The computer limited number modell have been used to prove fatigue results, and with the adequate material modell developement used at different type of ashpalts showed how gross aspalt can be replaced by the nets and grids usage.
The master curve is an appropriate tool to describe the behavior of the different asphalt mixtures. We can analyze the attitude of the asphalt at very special time and frequency range using master curve method and in this extreme condition we could not solve without it. Different shift coefficients calculation's methods were showed in this study. According to a Dutch (Sigmoid) method, the slope of the master curve determines the fatigue characteristic of the asphalt mixture. In this article we analyze and compare the master curves of the grid strengthened and non grid asphalt structures.
The rubber modified bitumen 45/80-55 (RMB 45/80-55) product has been used in
Hungary as bituminous binder for asphalt mix production since 2013. It is a
new kind of rubber bitumen manufactured using patented technology. Over the
past 8 years, it has been used to construct or renovate more than 100
asphalt road sections. Originally RMB 45/80-55 was used to replace paving
grade bitumen 50/70 in some road construction projects. However, asphalt
laboratory results and road construction experience showed that its quality
can also achieve or in terms of some parameters exceed that of asphalt
mixtures manufactured with polymer modified bitumen 25/55-65 (PMB 25/55-65).
Primarily, its excellent resistance to low temperatures and fatigue are
outstanding, in this respect; it surpasses the results of asphalts made with
polymer modified bitumen. Its favourable fatigue resistance compensates for
its lower stiffness; therefore, favourable results were obtained in the case
of track structure design too in comparison with PMB. Considering the road
construction benefits of this new type of rubber bitumen, as well as the
support of the environmentally friendly recovery of waste tyres and fitting
into a circular economy, a wider spread of the RMB product is realistically
expected in the future.
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