Cheng Peifeng, Zhang Zhanming, Yang Zonghao, Xu Jin, Li Yiming
Civil Engineering Department, Northeast Forestry University, Harbin 150040, China.
Key Laboratory of Road Structure and Green Ecological Technology in Heilongjiang Province, Northeast Forestry University, Harbin 150040, China.
Materials (Basel). 2021 Mar 16;14(6):1433. doi: 10.3390/ma14061433.
In this research, the feasibility of using nano-montmorillonite (MMT) in asphalt binders was investigated in terms of rheological properties, thermomechanical properties, and chemical structure composition. Different doses of MMT were added to the base asphalt and styrene-butadiene-styrene (SBS) asphalt as test subjects. The effect of nanomaterials on the high-temperature resistance of asphalt binders to permanent deformation was analyzed from dynamic mechanical rheology using the multiple stress creep recovery (MSCR) test. The sessile drop method test based on surface free energy (SFE) theory was employed and thermodynamic parameters such as surface free energy, cohesive work, and adhesion work were calculated to analysis the change in energy of the asphalt binder. In addition, changes in the chemical structure and composition of the asphalt binder were examined by Fourier transform infrared (FTIR) and gel permeation chromatography (GPC) tests. The results showed that MMT can effectively enhance the high-temperature elastic recovery and plastic deformation resistance of the asphalt binder. The intercalation structure produced in the asphalt binder enhanced the overall cohesive power and adhesion to the aggregate. The anchoring effect of the intercalation structure resulted in an increase in the macromolecular weight of the binder was demonstrated, indicating that MMT enhanced the overall intermolecular forces of the binder. In addition, the molecular crystal structure was characterized by characteristic functional groups in the infrared spectra, while demonstrating that no chemical reaction occurs during the modification of the binder by the nanomaterials.
本研究从流变性能、热机械性能和化学结构组成方面，对纳米蒙脱土（MMT）在沥青结合料中的应用可行性进行了研究。将不同剂量的MMT添加到基质沥青和苯乙烯-丁二烯-苯乙烯（SBS）沥青中作为试验对象。采用多应力蠕变恢复（MSCR）试验，通过动态力学流变学分析了纳米材料对沥青结合料抗高温永久变形性能的影响。采用基于表面自由能（SFE）理论的 sessile drop 法试验，计算了表面自由能、内聚功和粘附功等热力学参数，以分析沥青结合料的能量变化。此外，通过傅里叶变换红外光谱（FTIR）和凝胶渗透色谱（GPC）试验，研究了沥青结合料化学结构和组成的变化。结果表明，MMT 能有效提高沥青结合料的高温弹性恢复和抗塑性变形能力。沥青结合料中形成的插层结构增强了整体内聚力和与集料的粘附力。插层结构的锚固作用导致结合料的大分子质量增加，表明 MMT 增强了结合料的整体分子间作用力。此外，红外光谱中的特征官能团表征了分子晶体结构，同时表明纳米材料对结合料改性过程中未发生化学反应。
