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通过对4种超热老化温度下(190、210、230、250℃)浇注式改性沥青常规力学性能(软化点、针入度、延度)和流变力学性能的变化规律进行研究,研究结果表明:随着超热温度的提高,浇注式改性沥青低温和疲劳性能衰变明显,250℃时的低温延度只有190℃时的50%。若以劲度模量300 MPa时的开裂温度作为临界温度,250℃时的临界开裂温度比190℃时约高4℃。而随着超热温度的提高,改性沥青的高温性能则明显提高,车辙因子成倍数提高,因此改变超热温度对浇注式改性沥青力学性能影响显著。
Through the study of regular mechanical properties (softening point, penetration, ductility) and rheological mechanical properties of pouring modified asphalt under four kinds of superheat aging temperature (190, 210, 230 and 250 ℃) The results show that with the increase of superheating temperature, the low temperature and fatigue properties of pouring modified asphalt decay obviously, and the low temperature ductility at 250 ℃ is only 50% at 190 ℃. If the flexural modulus at 300 MPa MPa is taken as the critical temperature, the critical cracking temperature at 250 ° C is about 4 ° C higher than at 190 ° C. With the increase of the superheat temperature, the high temperature performance of the modified asphalt is obviously improved and the rutting factor is increased by a multiple. Therefore, changing the superheating temperature has a significant impact on the mechanical properties of the pouring modified asphalt.