Rheological and structural evolution of SBS modified asphalts under natural weathering
Rheological and structural evolution of SBS modified asphalts under natural weathering
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自然风化下SBS改性沥青的流变和结构演化
DOI：
10.1016/j.fuel.2016.07.018
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发表时间：
2016-11-15
期刊：
影响因子：
7.4
通讯作者：
Yao, Hongru
中科院分区：
文献类型：
--
作者：
Zhao, Xinyu;Wang, Shifeng;Yao, Hongru
丁苯共聚物(SBS)改性沥青已被广泛应用于延长路面使用寿命。了解SBS改性沥青(SBSMA)的自然老化机理，对于延长SBSMA路面的使用寿命和再生SBSMA路面具有重要意义。通过对不同老化程度沥青的流变性和结构演化的表征，追踪了基质沥青和SBSMA的自然风化过程。将滚压薄膜烘箱试验(RTFOT)和紫外线老化等人工老化与老化过程进行了比较。利用红外光谱、凝胶渗透色谱和动态剪切流变仪对这一过程进行了分析。结果表明，SBSMA在自然风化过程中，其化学结构和流变性能发生了显著变化。SBSMA在流变性和化学演化方面表现出与BA相同的老化趋势。在比较流变性能的老化比时，SBSMA的老化比BA严重，而在比较羰基指数的比率时，BA的老化更严重。此外，BA的老化以分子缩合为主，而SBSMA则以分子缩合为主。比较了SBSMA的人工老化和自然老化，指出RTFOT和UV老化不能完全模拟SBSMA的自然老化行为。(C)2016爱思唯尔有限公司。保留所有权利。
Styrene-butadiene-styrene copolymers (SBS) modified asphalt has been widely used for extending the service life of pavement. Understanding the natural weathering mechanism of SBS modified asphalt (SBSMA) is useful for both the extension of service life and recycling SBSMA pavement. The natural weathering process of base asphalt (BA) and SBSMA is traced by characterizing the rheological and structural evolution of different aged asphalts. Artificial aging such as rolling thin film oven test (RTFOT) and UV aging is compared with the weathering process. Infrared spectroscopic, gel permeation chromatography and dynamic shear rheometer are used to analyze this evolution. The results illustrate that significant changes occur in the chemical structures and rheological properties of SBSMA during natural weathering process. SBSMA shows the same aging trend as BA in terms of rheological and chemical evolution. The SBSMA aging is more serious than BA when comparing the aged ratio of rheological properties, whereas BA is more serious when comparing the ratio of carbonyl index. Furthermore, the molecular condensation is dominant in aging of BA than that of SBSMA. Comparing artificial aging and natural weathering of SBSMA, it is noted that RTFOT and UV aging could not completely simulate the natural weathering behavior of SBSMA. (C) 2016 Elsevier Ltd. All rights reserved.