Experimental study on aging properties and modification mechanism of Trinidad lake asphalt modified bitumen
Experimental study on aging properties and modification mechanism of Trinidad lake asphalt modified bitumen
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特立尼达湖沥青改性沥青老化性能及改性机理试验研究
DOI：
10.1016/j.conbuildmat.2015.10.155
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发表时间：
2015-12-30
影响因子：
7.4
通讯作者：
Pei, Jianzhong
中科院分区：
文献类型：
--
作者：
Li, Rui;Wang, Pengzhi;Pei, Jianzhong
制备了特立尼达湖沥青(TLA)改性沥青，研究了TLA对沥青老化性能的影响，探讨了TLA改性沥青的改性机理。分别采用薄膜烘箱法(TFOT)、压力老化容器法(PAV)和紫外线(UV)法制备老化共混物。用红外光谱(IR)和原子力显微镜(AFM)研究了改性沥青的形态特征。老化模拟后，体系的滞留针入度(Rp)增加，粘度老化指数(VAI)和软化点增量(45)降低。结果表明，TLA的加入能有效提高胶料的耐热氧老化性能和抗紫外线老化性能。软化点比的敏感程度高于AS，但低于RP。从红外光谱来看，TLA的加入没有增加新的吸收峰，修饰主要是物理修饰。AFM研究表明，TLA的加入改变了沥青质与其他沥青组分之间的交叉效应，形成了更稳定的体系。此外，分散相的缔合作用提高了体系的刚性、软化点和粘度。(C)2015爱思唯尔有限公司。保留所有权利。
Trinidad lake asphalt (TLA) modified bitumen was prepared to study effect on aging properties and study modification mechanism. The aged blend was prepared by thin film oven test (TFOT), pressure aging vessel (PAV) and ultraviolet (UV) radiation, respectively. Morphology characteristics of modified bitumen were investigated by infrared spectra (IR) and atomic force microscope (AFM). The retained penetration (RP) can be increased while viscosity aged index (VAI) and softening point increment (45) get decreased after aging simulation. It indicated the addition of TLA can effectively ameliorate aging resistance of thermal-oxidative and UV-aging. The susceptible degree of softening point ratio was higher than AS but lower than RP. From IR spectra, there are no new absorption peaks added for TLA addition and the modification was mainly physical. Investigation of AFM showed that addition of TLA change the intersection effect between asphaltene and other bitumen components to form the more stable system. Besides, the association effect of the dispersed phase improved system rigidity, softening point and viscosity. (C) 2015 Elsevier Ltd. All rights reserved.