چكيده به لاتين
Researchers have made extensive efforts to illustrate future applications of nanotechnology in asphalt remediation to demonstrate the modification mechanism. The use of nanomaterials is expanding due to its good effect on the performance of asphalt mixtures at different conditions and temperatures. One of the most important issues in asphalt mixtures is the prevention of crack growth at low temperatures and intermediate temperatures. The use of fracture mechanics to analyze crack growth in asphalt mixtures has been observed by researchers at different temperatures in pure tensile modes. However, asphalt mixtures are subjected to different tensile, shear and a combination of tensile and shear loads during their service life.
Since little research has been done so far on the effect of nanomaterials on the fracture behavior of asphalt mixtures, the purpose of the present study was to investigate the effect of nano calcium carbonate on the fracture behavior of asphalt mixtures at low and intermediate temperatures. Tensile, shear and tensile-shear. For this purpose, cracked semicircular (SCB) specimens have investigated the crack propagation in asphalt mixtures under monotonic loading conditions under pure tensile, pure shear and tensile-shear composite loading. Therefore, unmodified asphalt samples were first manufactured and since the main purpose of the study was to investigate the effect of nanomaterials on the fracture behavior of the mixtures, the modified bitumen was prepared in four different weight percentages (1%, 3%, 5% and 7%). %) And their fracture toughness were compared with unmodified mixtures. Finally, the critical load of each mixture (modified and unmodified) was determined and calculated using the relationships in the fracture toughness of the fracture toughness specimens. Asphalts, and the influence of each of the variables mentioned on the fracture life of asphalt mixtures can vary depending on the loading mode.
