No abstract
Construction of modern and durable bituminous pavements requires high quality bituminous binder, aggregates and additives. The main objective of this paper was to analyse and compare viscoelastic properties of unmodified and polymer modified bitumens produced in Poland, Europe, in order to assess their quality. In this paper there are presented results of bituminous binder European classification tests (penetration, softening point and Fraass breaking point) as well as rheological test results conducted over a wide range of temperatures. In addition, image analysis of the microstructure of selected polymer modified bitumens is also presented. Based on the analysis it was concluded that although bituminous binders complies with European specification requirements, they are significantly different in terms of their rheological properties. It was found that regardless of binder producer, bituminous binder within the same hardness group exhibit different low and high temperature properties.
Bitumen fluxes of vegetable origin Summary-Methods of preparation of bitumen fluxes from rapeseed and linseed oil methyl esters were developed. The methods consist in the catalytic oxidation of vegetable oil methyl esters in the absence or presence of peroxides as the accelerators. The products obtained can be used as environmentally friendly bitumen fluxes. The rapeseed oil methyl ester has to be oxidized at elevated temperature in the presence of a catalyst. Linseed oil methyl ester does not need pre-oxidation before mixing with bitumen, but mixing with the catalyst is necessary. Contrary to conventional bitumen solvents, the fluxes are not volatile and have an ignition point of approximately 200 o C, so they do not raise safety problems. The hardening of the fluxed bituminous binder is going not by evaporation of the flux but by oxidative polymerization in the presence of a catalyst. The use of the fluxes let considerably reduce the mixing or spreading temperature of the binder, as well as the compacting temperature of the binder-aggregate mix.
Paper presents innovative technological solution applied in bridge pavement. New asphalt mixture, called SMA-MA, uses benefits of both mastic asphalt (MA) widely used as a bridge waterproofing layer and stone mastic asphalt (SMA) and provides more durable mixture. According to the wide research plan, several mixtures were tested for their resistance to permanent deformation, water susceptibility, fatigue and aging resistance. Conducted research proved that such mixture can be successfully used as waterproofing and protective layer as well as traffic carrying layer. In comparison to the typically used asphalt mixtures (SMA, MA or asphalt concrete), SMA-MA presents: mixture resistant to permanent deformation with very low air voids content (about of 0.5%) reachable with typical asphalt mixture compaction temperature of 180°C. The temperature of application SMA-MA mixture is about 30°C less than temperature of mastic asphalt, but the ability of sealing is comparable. SMA-MA mixture is a fast application technology using conventional equipment. In climatic conditions of middle Europe showing high number of freezingthawing cycles, it is recommended to use such innovative technological solution on bridge decks.
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