Viscosity-Temperature Characteristics and Modification Mechanism of Straw Modified Asphalt Mortar

doi:10.3969/j.issn.1674-0696.2023.12.06

Abstract

Abstract: To explore the viscosity-temperature characteristics and modification mechanism of the straw modified asphalt, the Brookfield rotation viscosity test on the straw modified asphalt mortar was firstly carried out to analyze the influence of straw content and type on the viscosity of the modified asphalt mortar, and the temperature sensitivity index was also calculated. Secondly, the infrared spectral characteristics of three kinds of straw modified asphalt mortar were discussed and the relationship between functional group index and viscosity-temperature characteristics of straw modified asphalt was explored. Finally, combined with the microstructure characteristics of the straw modified asphalt, the influence mechanism of straw on base asphalt was revealed. The research shows that the addition of straw fiber increases the viscosity of asphalt. Among them, the viscosity increasing effect of rice straw is better than that of corn straw and wheat straw, and the viscosity decreases with the increase of temperature. No new functional groups are generated in the infrared spectra of the three types of straw modified asphalt mortar, and the addition of straw mainly relies on its physical bonding with asphalt to exert its effect. The amount of straw content affects the distribution of straw inside the asphalt. When the content of straw is 5%, the straw fibers overlap each other to form a network strengthening structure, and at this time, the straw fibers have the best “reinforcement” effect on asphalt. The research results can provide relevant reference basis for the research and development of modified asphalt pavement materials.

Key words: highway engineering; straw modified asphalt; infrared spectrum; scanning electron microscope (SEM); viscosity-temperature characteristics; microscopic mechanism

摘要： 为探讨秸秆改性沥青胶浆的黏温特性及改性机理，首先，开展秸秆改性沥青胶浆的布氏旋转黏度试验，分析秸秆掺量、种类对改性沥青胶浆黏度的影响，并计算温度敏感性指数；其次，分析3种秸秆改性沥青胶浆的红外光谱特性，探讨官能团指数和秸秆改性沥青胶浆黏温特性的关系；最后，结合秸秆改性沥青胶浆的微观形貌特征，揭示秸秆对基质沥青的影响机理。研究表明：秸秆纤维的掺加提高了沥青的黏度，其中水稻秸秆的增黏效果优于玉米秸秆和小麦秸秆，且黏度随着温度的升高而减小；3种秸秆改性沥青胶浆的红外光谱图中均未产生新的官能团，秸秆的加入主要依靠其与沥青的物理黏结发挥作用；秸秆的掺量影响其在沥青内部的分布，当秸秆掺量为5%时，秸秆纤维相互搭接形成网络加强结构，此时秸秆纤维对沥青的“加筋”效果最佳。研究成果可为改性沥青路面材料的研发提供相关的参考依据。

关键词: 道路工程；秸秆改性沥青；红外光谱；SEM；黏温特性；微观机理

CLC Number:

U416.217

DONG Juan1, SI Youxiang2, XIE Wei3, ZHANG Ke2,3, ZHANG Yi3. Viscosity-Temperature Characteristics and Modification Mechanism of Straw Modified Asphalt Mortar[J]. Journal of Chongqing Jiaotong University(Natural Science), 2023, 42(12): 37-44.

董娟1，司有翔2，谢巍3，张苛2,3，张毅3. 秸秆改性沥青胶浆的黏温特性及改性机理研究[J]. 重庆交通大学学报（自然科学版）, 2023, 42(12): 37-44.

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