Ways to increase the inter-maitenance period of roads

Introduction. Currently, more than 96% of the roads in our country are built with non-rigid pavements with bases made of dispersed materials of crushed stone, sand-gravel mixtures, sand, etc. Significant disadvantages of such road structures are high material consumption and significant operating costs, including those associated with low service life between repairs. According to expert estimates, Russia’s losses due to the poor quality of the highway network amount to 3% of gross domestic product. In 2017, the government decided to increase service life between repairs of federal highways, for example, for major repairs from 12 to 24 years. To solve the problem of increasing the time between repairs, it is necessary to ensure a significant increase in the total modulus of elasticity on newly constructed or repaired roads. One of the effective ways to increase the strength characteristics of non-rigid road pavements is the wider use of monolithic bases made from soils or asphalt granulate treated with mineral binders, as well as industrial wastes with own binding properties. Replacing bases made of dispersed materials with monolithic ones makes it possible to reduce the material consumption of road pavement by 20-50%, the cost of construction work by up to 45% and increase the service life of roads by 35-40%. Materials and methods. In order to study the influence of the type of filler on the processes of structure formation of sludge crushed stone material, research on the strengthening of granite crushed stone of the 0-15 mm fraction and crushed stone from low-active blast furnace slag, 15% nepheline sludge was carried out. Samples with a diameter and height of 7 cm from mixtures of optimal humidity by pressing under a load of 15 MPa were formed. The samples under normal conditions and tested at the ages of 1, 3, 6 and 9 months to determine the compressive and tensile strength in bending were stored. In order to determine the optimal dosages of sludge for strengthening slag crushed stone, samples with a sludge content of 5, 10, 20, 30% were formed using a similar method and tested for compression and splitting immediately after production and then after 1, 3, 6, 9 and 12 months hardening. When examining experimental sections of transitional type coatings at the first stage of construction of oil field roads, the total elastic moduli were determined using a MADI-TsNIL deflectometer and a loaded MAZ-500A vehicle. To study the hardening kinetics of sludge-g