Estimated Valuation of the Cost of Road Construction with the Use of Composite Cationic Bituminous Structures

Annotation. The need for formation of prices for road construction works producing, by using composite of cationic bituminous structures, is dictated by absence of this type of work in estimate-normative base, due to the fact that this type of materials had never been used before. Estimated specifications could be used either for determination of work cost or for substantiation of efficiency of using new type of materials. This paper provides basic concepts, related to formation of estimate-normative base for determination of construction and installation works cost, particularly road construction works, also it shows formation of coating installation prices by using composite of cationic bituminous emulsions.


Introduction
Modern system of estimated specification is the foundation of definition of construction and installation works cost, particularly road construction works cost.Current system can't cover the whole spectrum of modern constructive materials, particularly new materials that had never been used before in constructing or in other definite type of works.
The development of estimated specification for road constructing work production with using composite cationic bituminous structures is determined by advantages of this material over traditional technologies of hot and cold road asphalt paving: 1.There is no need in adherence to temperature conditions, due to the fact that this method can be used either in worm or in cold weather conditions.The repairing of road cover can be produced in high humidity conditions at positive ambient temperatures [1,9].
2. You can exploit roads 2 hours after finishing repairing works, which is especially actual on increased workload roads [2,6,11].
3. The value of bitumen using is highly reduced compared to hot and cold asphaltconcrete mixtures structure [1,9].
4. The use of previously recorded cover becomes possible, which significantly reduces prime cost and increases ecological effect, reduces the measure of road repairing construction's waste [2,6,11].
5. It eliminates the need for additional installation of coatings of hot and cold asphaltconcrete mixtures similar to existing technology of road installation with recycling using [3,6,9].
6.The coating is more durable than hot and cold asphalt paving (alternative covers are usually used for 5 years, though hot and cold asphalt paving's life time is only 3 years, which highly increases the economic effect of using offered technology) [3,6,9].
7. Covers with composite structures based on cationic bituminous emulsions in all types of repairing works gives more durable result compared with traditional technologies due to the fact of better grip [4,6].
This paper shows the process of formation of prices for road construction works with using composite cationic bituminous structures, and also gives a comparison of work costs for road covering installations with using new materials and traditional methods of hot and cold asphalt-concrete mixtures.Estimated specifications are developed for every several measurer of construction-installation and road repairing works.In the reviewing case we will use 1000 m2 unit of measurement, which suggests work's execution in value of 70 m3 with thickness of the covering of 7 сm and extension of the road about 167 m with middle width of the road of 6 m.While forming the prices, we use current normative base, corrected to the current price level and represented in dollar equivalent, which was motivated by the possibility of applying this technology not only in Russian Federation but also abroad.The forming of estimated specifications for new types of work (recycling and coverings with using composite structures had first priority, due to the fact that hot and cold coverings already have their prices.
The consumption and price of materials needed to perform road work in different ways are shown in Table 1.
We offer Germany's company's WIRTGEN productions as main equipment for work producing.It was rather efficient while used on road constructing machine market.This equipment allows to solve wide range of tasks, such as strengthen the soil and road covers installations.You can get high-class building material, instead of low quality soil, with the help of this machines.Additives and binders are cement, lime and water.Working as a cold recycler, WR series machines transform worn out layers of asphalt-concrete into high-class layers with a large bearing capacity, regardless of their size and layers thickness.The most suitable for our needs is WR 200 machine.We calculated the cost of machine-hours is $ 169.45, and the estimated rate -1.67 machine-hours for 1000 m2 of pavement.Following estimated specifications have been developed on the base of presented data and pre-existing estimated standards: 1. Disassembly of asphalt-concrete covers and foundations with later processing of removed layerrecycling, 1000m3 (Table 2).
2. Design of covers with use of composite cationic bituminous structures (Table 3).

Discussion
Estimated calculations for producing works were built on the basis of prices represented in Table 4, there are three compared methods.Following results for the unit cost of 1 m2 of pavement were obtained on the basis of the estimated calculations: -hot asphalt concrete mixtures -- -composite cationic bituminous structures --1,46 $, including materials -0,88 $.Economical effect of composite cationic bituminous structures installing makes up comparing: -to use of hot coverings -1,87$, including materials -1,28$; -to use of cold coverings -3,09$, including materials -2,54$.Using suggested technology of producing road covering attracts economy in value 11200-18500 $ per 1 km of repaired roads, consequently [2,8,12].

Conclusion
Applying this new method based on using composite of cationic bituminous emulsions and recycling technology can help to reduce time limits for producing repairing works of road covering and their prompt commissioning.It can help to produce repairing works regardless of the climatic conditions, to provide economic and ecologic effect.

Table 1 .
Volume and price of materials used

Table 3 .
Design of covers with use of composite cationic bituminous structures, 1000 m2 Estimated prices for new and pre-existing types of work are listed in Table4.