Optimal selection of a plasticizer for asphalt-concrete coating

Purpose. To investigate the optimal selection of plasticizer for asphalt concrete coatings. The fragility of asphalt concrete, which occurs as a result of aging, exposure to sunlight, temperature variations, does not always allow it to be reused without plasticizers, which can affect the intensity of intermolecular interaction and, accordingly, the properties of asphalt concrete, create a system of elasticity. The option of plasticizers in the course of laboratory studies was carried out in accordance with the natural qualities of bitumen and plasticizers. Methods. Comparison of the brittleness and strength dependences on the deformation rate. Results. The dependence of the temperature of brittleness and strength on the deformation rate is established. In the course of experiments, on a millimeter paper, a load diagram was written − a deflection using an inductive sensor connected to the test drive CD-10 through an amplifier, which allows to increase the actual deflection by 1000 times. Scientific novelty. The study of asphalt concrete for bending over a wide range of temperatures and deformation rates allowed to determine the temperature of brittleness of asphalt concrete after thermal aging. Practical relevance. Thus, the proposed method for reducing the monolithicity of asphalt concrete in the coating by introducing the optimal amount of plasticizer (lubricant). The dependence of the temperature of brittleness of stressed asphalt concrete on the rate of deformation in the range of 15…544 mm/min is established. At temperatures from +50 to −20 °C it is possible to calculate their Tbr at any rate of bending according to the data obtained experimentally at two values of the bending rate. The difference in the value of Tbr of individual asphalt concrete in the specified range of bending rates reaches 30 °C.