Modeling Asphalt Mastic Modulus Considering Substrate–Mastic Interaction and Adhesion
Modeling Asphalt Mastic Modulus Considering Substrate–Mastic Interaction and Adhesion
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DOI：
10.1016/j.conbuildmat.2018.01.140
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发表时间：
2018-03
影响因子：
7.4
通讯作者：
Zejiao Dong;Zhiyang Liu;Peng Wang;Tao Zhou
中科院分区：
文献类型：
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作者：
Zejiao Dong;Zhiyang Liu;Peng Wang;Tao Zhou
集料与沥青胶浆之间的微观相互作用和粘附作用导致集料表面沥青胶浆宏观模量的不均匀性。这种非均匀性在混合物的多尺度模型中被忽略，并导致预测误差。本研究的目的是建立一个宏观力学模型，考虑微观集料-砂胶相互作用和粘附来表征砂胶模量与集料基材接触。通过扫频试验测量了不同厚度的砂胶的模量，并将所测砂胶简化为粘弹性单元系列的力学模型。通过引入厚度的分段函数，推导出了包含影响层和体相贡献的模量表达式。四个模型参数分别描述了细观相互作用、粘结力、影响范围和模量。将该模型应用于不同基底的胶砂模量，结果有效地证明了该模型的适用性。界面模量和体积模量具有温度、频率依赖性和时间-温度叠加性，表明该模型能够较好地表征胶粘剂的粘弹性。此外，评价基板上的测量模量和真实的模量之间的差距表明考虑相互作用和粘附的必要性。
Microscopic aggregate–mastic interaction and adhesion lead to macroscopic modulus nonuniformity of asphalt mastic on aggregate surface. This nonuniformity is ignored in multiscale models of mixture and causes prediction errors. This study aimed to establish a macromechanical model considering microscopic aggregate–mastic interaction and adhesion to characterize the mastic modulus in contact with aggregate substrates. Frequency sweep tests were conducted to measure the modulus of mastic with different thicknesses, and the measured mastic was simplified as a mechanical model comprising viscoelastic elements series. By introducing a piecewise function of thickness, the measured modulus was deduced as an expression containing the contribution of the affected layer and bulk phase. Four model parameters described the microscopic interaction, adhesion, affected range, and modulus of bulk mastic, respectively. The model was applied to the mastic modulus on different substrates, and results effectively demonstrated the applicability. The temperature and frequency dependence and time–temperature superposition of interface mastic modulus and bulk mastic modulus were observed, and it demonstrated the model’s ability to characterize mastic viscoelasticity. Moreover, evaluation of the gap between the measured and real moduli on a substrate showed the necessity of considering interaction and adhesion.