PR-Module改性沥青混合料力学性能

Mechanical properties of PR-Module modified asphalt mixture

为了确定PR-Module改性沥青混合料的力学性能和制备工艺参数,以SK-70#为基质沥青,选用PR-Module外掺剂制备改性沥青混合料,通过马歇尔试验、劈裂试验、静态抗压回弹模量试验和动态模量试验,研究PR-Module改性沥青混合料的制备工艺参数和力学性能。研究结果表明：掺入PR-Module改性剂后,PR-Module改性沥青混合料的制备工艺参数比未掺PR-Module的普通沥青混合料有较大变化;随着PR-Module掺量的增大,沥青混合料的劈裂强度先增大后减小;PR-Module外掺剂能明显提高沥青混合料的疲劳寿命和静态抗压回弹模量;在相同试验条件下,PR-Module改性沥青混合料比未掺PR-Module的普通沥青混合料的动态模量大、相位角小;依据Sigmoidal函数方程,建立了参考温度为20℃时PR-Module改性沥青混合料的动态模量主曲线,并与静态抗压回弹模量进行了对比分析,得出在相同温度下,静态抗压回弹模量与动态模量相对应的加载频率较小,大约为0.03~0.07Hz。

The modified asphalt mixture was made by taking SK-70~ as the matrix asphalt and PR-Module as the additive, and the preparation process parameters and mechanical properties of PR-Module modified asphalt mixture were studied based on the Marshall test, the splitting test, the static modulus test and the dynamic modulus test. The results show that with the in- corporation of PR-module modifier, the preparation process parameters of PR-Module modified asphalt mixture are clearly different from undoped PR-Module common asphalt mixture lWith the increase of PR-Module content, splitting strength of the asphalt mixture increases first and then decreases; PR-Module additive can obviously improve fatigue life and the static compressive resilient modulus of asphalt mixture l under the same experimental condition, there will be higher dynamic modulus and smaller phase angle using PR-Module modified asphalt mixture than using undoped PR-Module common asphalt mixture. According to the Sigmoidal equation,the dynamic modulus master curve for PR-Module modified asphalt mixture is established under 20 ~C of the reference temperature, and compared with the static/modulus. Under the same temperature, static compressive resilient modulus corresponding to dynamic modulus is obtained at low frequencies, ranging from 0.03 Hz to 0.07 Hz. 8 tabs, 9 figs, 15 refs.