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研究了不同沥青含量(A/C)的水泥-沥青复合胶凝材料7d龄期的动态黏弹性力学行为。选择3种温度环境(?25℃、25℃和75℃),采用动态黏弹谱仪测试了3种不同A/C的水泥-沥青胶凝材料(简称为CAB)在频率范围0.1Hz~100Hz的动态力学性能,获得了不同温度下储存模量、损耗模量及损耗角随加载频率变化的基本规律。基于频-温等效原理建立了常温下CAB的储存模量随频率变化的主曲线,并利用Burgers本构关系对其动态力学行为进行了模拟。结果表明:随A/C和温度的升高,CAB的储存模量减少,黏弹性显著增强;低A/C的CAB,或低温下高A/C的CAB,其储存模量随频率的对数线性增加;随A/C和温度的升高,逐渐出现非线性递增规律;随A/C的升高,主曲线频幅变窄,表明模量对频率的敏感性增大;Burgers黏弹性力学模型可用于表征不同A/C的CAB动态模量与频率的关系,与实验数据吻合较好。
The dynamic viscoelastic behavior of cement-asphalt composite binder with different bitumen content (A / C) at 7d stage was studied. Three different A / C cement-asphalt cementitious materials (abbreviated as CAB) were tested by dynamic viscoelastic spectroscopy in three temperature environments (-25 ℃, 25 ℃ and 75 ℃) in the frequency range of 0.1Hz ~ 100Hz The dynamic regularity of the storage modulus, loss modulus and loss angle with loading frequency under different temperatures was obtained. Based on the frequency-temperature equivalence principle, the main curve of the storage modulus of CAB at room temperature with frequency was established and its dynamic behavior was simulated by Burgers’s constitutive equation. The results show that with the increase of A / C and temperature, the storage modulus of CAB decreases and the viscoelasticity increases significantly. The CAB with low A / C or CAB with high A / C at low temperature has the same effect on the storage modulus with frequency With the increase of A / C and temperature, the law of nonlinear increase gradually appears. With the increase of A / C, the amplitude of the main curve becomes narrower, which indicates that the sensitivity of modulus to frequency increases. Burgers viscoelasticity The mechanical model can be used to characterize the relationship between CAB dynamic modulus and frequency of different A / C, which is in good agreement with the experimental data.