TECHNICAL-ECONOMIC EFFICIENCY OF THE USE OF NANOMODIFIED FILLER FOR ASPHALT-CONCRETE

Subject: technical and economic efficiency of the use of nanomodified porous mineral powder in the composition of asphalt-concrete mixture. The system of quality indicators of crushed stone-mastic asphalt-concretes obtained using nanomodified porous filler is presented. A general criterion for the quality of asphaltic concrete and a method for assessing the technical and economic efficiency of the use of nanomodified filler to control the properties of asphalt-concrete have been developed. Using the methods of system analysis, decomposition of the asphalt-concrete quality system was carried out and the basic quality indicators and dependencies for calculation of particular quality criteria were identified. The efficiency of using a filler based on a porous mineral material whose surface is modified with an additive based on iron hydroxide sol and silicic acid is shown. Research objectives: substantiation of effectiveness of the use of nanomodified porous mineral powder in the composition of asphalt-concrete mixture, taking into account the efficiency and cost criteria. Materials and methods: oil road bitumen BND 60/90, gabbro-diabase crushed stone of 5-20 mm fraction, granite crushing and screening products, stabilizing additive Viatop-66 and nanomodified diatomite were used. Samples of crushed stone-mastic asphalt-concrete were tested in accordance with the standard methods, and resistance to varying weather and climatic conditions and also rutting resistance were studied. Results: the proposed criteria allow one to estimate the effectiveness of the use of nanomodified mineral powder in asphalt-concrete, taking into account both the technical characteristics of the asphalt-concrete, obtained by using the powder, and the economic costs necessary to achieve improvement in quality indices. Concrete SMA-20, in which 100 % of the traditional filler is replaced by a powder based on diatomite, modified with iron (III) hydroxide sol and silicic acid, has a 28 % higher technical and economic efficiency compared to traditional crushed stone-mastic asphalt-concrete. This is achieved by significantly improving the quality of the material compared to the necessary ones. Conclusions: the use of the powder based on diatomite, modified with the iron (III) hydroxide sol, and silicic acid as a filler in the composition of asphalt-concrete mixture makes it possible to increase the asphalt-concrete efficiency index by 35 %. The increase in technical and economic efficiency by 28 % justifies application of the modified filler.