Research on thermal stress fracture performance of low-temperature asphalt concrete in castel high altitude area

The temperature in the southwest Castel highland area is relatively low, and asphalt concrete on road surface a low-temperature state all year round. Strong ultraviolet radiation will interfere with material cause it to fracture damage. This paper uses bending test thermal stress constrained specimen (TSRST) performance of mixtures different gradation types under (UV) aging conditions. Existing studies are mainly based aging, which cannot take into account interactions between binder aggregate phases during aging. analyzes correlation indexes after UV mixture parameters, as well impact mixtures, mechanical strength prediction model was established. results indicate that when time less than 2 months, degradation rate first accelerates then gradually slows down. degree influence graded descending order: stone concrete, AC 16 AC-13 concrete. relationship parameters strong. It suggested appropriate equivalent outdoor months At point there no condition, worth acquired by prescribed consider attenuation coefficient, matrix can allude 0.84; modified has value 0.9. article great significance for guiding research high-altitude areas.