|Abstract Title:||Bituminous impregnating compositions: a solution to the problem of protection of asphalt-concrete coatings|
|Session Choice:||Environmental Regulation for the Petroleum, Petrochemical and Chemical industries|
|Presenter Name:||Ms Elena Chigorina|
|Co-authors:||Mr Anatoly Razinov|
Dr Yulia Ubaskina
Mr Ivan Kovtun
Prof Victoria Ryabenko
|Company/Organisation:||FSUE «IREA» NRC «Kurchatov Institute»|
Abstract Information :
Now growth and development of transport infra structure is followed by emergence not only obvious benefits, such as increase in the gross internal income of the country, efficiency of work of all services, timely delivery of health care, providing with food products, etc., but also the negative moments. Primarily, this is due to the construction and the maintenance of the roadway. As a rule, even the asphalt concrete road, which was made in accordance with the standards, is exposed to the destructive influence of climatic and anthropogenic factors.
The destruction of the roadway is the reason of a soil pollution of respective territories, air, superficial water, groundwater and the waters, which are adjacented to the roads.
Impregnating compositions based on a modified bituminous binder were proposed to solve the problem of protection of asphalt-concrete coatings from the negative impact of natural and artificial character and to increase the protection life-time. The compositions have an affinity to the main component of the road surface, bitumen, and also improve the properties of asphalt concrete pavements.
?he use of polymerized petroleum resins (PPR) as modifiers allows to obtain new bituminous materials with improved properties and to recycle ethylene and propylene pyrolysis byproducts as well.
To obtain the modified bitumen which are useful for protective impregnating compositions, we chose the petroleum polymer "Sibplast". The latter is the product of thermal polymerization of C9 fraction (softening point range is 80-130°C) and bitumen BND 60/90.
The bituminous binder was modified in a continuous-cycle steel reactor by injecting the petroleum polymer (5 to 15 wt.%) into the heated bitumen, followed by maintenance at the temperature not exceeding 180°C. The maintenance time was in the range from 30 to 90 minutes.
The resulting modified binders were found to be homogeneous resin colored from dark brown to black, having a penetration depth ranging from 35 to 60 at 25°C, 0.1 mm. According to the "ring and ball" method, the softening temperature was ranged from 40 to 60°C and ductility was more than 70 cm at 25°C.
To make a protective impregnating composition, the resulting modified bitumens were combined with petroleum ethers ("NefRas"). The test data of the asphalt-concrete coating having the impregnated layer were compared with those of control samples (without application). It was confirmed that water saturation, which is the main operational property of asphalt concrete pavement, has a decreased value.
Upon treatment the surface of a road asphalt concrete with an impregnating composition, the treated surface reveals no cracking and remains unchanged, and no incoming pollutants were found.