The effectiveness of using complex mineral binders to strengthen asphalt granulate

Introduction. The use of cold regeneration technology with stabilization of asphalt granulate by various binders in the repair of roads with nonrigid pavement allows to increase the time between repairs considerably, to reduce the material consumption for road structures, and operating costs.

At the same time, the replacement of cement used to strengthen asphalt granulate with complex slow-hardening mineral binders with an increased content of dicalcium silicate (belite) will save significant volume of cement, improve the technological parameters of asphalt granulate concrete mixtures and enhance the durability of road structures due to the long-term preservation of a large reserve of non-hydrated binder in asphalt granulate concrete. Therefore, the development of scientifically based optimal compositions of complex mineral binders for strengthen ing asphalt granulate is a highly relevant scientific and practical task.

Materials and methods. Laboratory studies included the determination of the physical and physical-mechanical properties of the initial material used to produce asphalt granulated concrete: nepheline sludge, Portland cement, and asphalt granulate, according to standard methods described in industry road methodological documents and Interstate standard: ODM 218.3.043-2015, GOST 31108-2020, and ODM 218.6.1.005-2021, respectively. The measurements of grinding fineness, time of initial setting and compressive strength of the developed mineral binders after 56 days have also been fulfilled.

The manufacture and testing of asphalt granulated concrete samples has been carried out in accordance with the requirements of industry road methodological document: ODM 218.6.1.005-2021. In addition to the standard check ing periods for samples aged 7 and 28 days, tests have been performed at the age of 270 days.

Results. A theoretical justification is given for the use of nepheline sludge as a component of complex mineral bind ers to strengthen asphalt granulate. Optimal compositions of complex mineral binders to 5.0 class from nepheline sludge, 5-15% activated Portland cement have been developed. Optimal dosages of 5-15% of complex binders have been recommended for strengthening asphalt granulate during the construction of foundations and coatings. The use of these binders will enable to obtain high-tech asphalt granule concrete mixtures and asphalt granule concrete with increased service life and minimal cement consumption, which will help to extend the time between repairs and improve the environmental conditions.

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