Т. 59. Бр. 3.
Рез. на англ. ез.
DOI: 10.71167/uaceg.2026.590311
Анотация
" A durable and well-performing interlayer bond is essential to ensuring the long-term service life of asphalt pavements. To evaluate the shear stiffness at the interface between asphalt layers, a new Cyclic Testing of Interlayer Bond apparatus (CTIB) has been used to test double-layer asphalt specimens. An extensive testing methodology was designed to investigate the combined effects of repeated traffic loading, acceleration, braking actions, and temperature, while considering all relevant factors that influence interlayer bonding. Experimental tests were conducted under sinusoidal cyclic shear loading at various frequencies, temperatures, and normal stress levels to investigate the combined effects of these conditions. The gradients of the average interlayer shear stiffness were calculated for a C60BP1-S bitumen emulsion applied at rates of 200 g/m?, 300 g/m? and 400 g/m? on clean surfaces of both asphalt layers. A sigmoidal master function was used to determine the optimal amount of bitumen emulsion. A comparison of the shear stiffness of finely polished coarse surfaces at three bitumen emulsion rates was conducted. For the conventionally produced interlayer bond, shear stiffness values were significantly higher at all three tack coat application rates than at finely polished interfaces. Complete loss of adhesion and frictional resistance was observed for both conventionally prepared interfaces and polished surface specimens at +50 °C under the lowest loading frequency and in the absence of normal stress, indicating severe deterioration and inadequate interlayer bonding under these conditions."
