| 引用本文: | 贾晓东,梁乃兴,彭义雯.无机微粉填料对沥青胶浆疲劳性能影响规律分析[J].哈尔滨工业大学学报,2022,54(3):148.DOI:10.11918/202008041 |
| JIA Xiaodong,LIANG Naixing,PENG Yiwen.Analysis on fatigue performance of asphalt mortar with inorganic micro-powder filler[J].Journal of Harbin Institute of Technology,2022,54(3):148.DOI:10.11918/202008041 |
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| 摘要: |
| 为了探究无机微粉填料在沥青胶浆中的疲劳性能影响规律,以3类9种常用无机微粉颗粒作为添加矿料,从无机微粉填料颗粒形貌特征、填料类型和颗粒粒径出发,通过扫描电镜（SEM）对微粉颗粒的形貌特征进行表征,再通过动态剪切流变仪（DSR）时间扫描试验分析不同种类微粉填料对沥青胶浆的疲劳性能的影响规律,然后采用Nf50和NDER两种指标对沥青胶浆疲劳寿命进行比对分析。 结果表明:扫描电镜下消石灰微粉颗粒表现出较多的表面孔隙和复杂表面纹理,动态剪切流变试验下随着无机微粉颗粒粒径的减小,沥青胶浆的疲劳性能有较大改善；同一颗粒粒径下,由于形貌特征和化学组成的差异使消石灰和水泥表现出优于石灰岩的疲劳性能；NDER与Nf50相比,疲劳寿命意义清晰、数值易确定,且所获得疲劳寿命加载次数均较小,用于沥青路面结构设计和材料选择安全性高,推荐采用NDER对胶浆疲劳寿命进行分析。 |
| 关键词: 无机微粉 颗粒粒径 沥青胶浆 疲劳性能 SEM |
| DOI：10.11918/202008041 |
| 分类号:U416.217 |
| 文献标识码:A |
| 基金项目:重庆市自然科学基金面上项目(cstc2020jcyj-msxmX0320)； 重庆市教委科学技术重点项目(KJZD-K201904001)； 重庆工商职业学院科研项目(NDZD2020-01) |
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| Analysis on fatigue performance of asphalt mortar with inorganic micro-powder filler |
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JIA Xiaodong1,2,LIANG Naixing1,PENG Yiwen3
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(1. School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China; 2. School of Urban Construction Engineering, Chongqing Technology and Business Institute, Chongqing 400085, China; 3. School of Economics and Management, Chongqing Jiaotong University, Chongqing 400074, China)
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| Abstract: |
| In order to explore the influence of inorganic micro-powder fillers on the fatigue performance of asphalt mortar, nine kinds of commonly used inorganic micro-powder particles in three types were used as additive mineral materials, and the morphology characteristics, filler types, and particle sizes of the micro-powder particles were investigated. The morphology characteristics of the micro-powder particles were characterized by SEM, the influence of different kinds of micro-powder fillers on the fatigue properties of asphalt mortar was studied by dynamic shear rheometer (DSR), and the fatigue life of asphalt mortar was compared and analyzed by indexes Nf50 and NDER. Results show that under SEM, the hydrated lime particles had more surface pores and complex surface texture, and the fatigue performance of the asphalt mortar was greatly improved with the decrease in the particle size of the inorganic micro-powder filler under dynamic shear rheological test. With the same particle size, due to the special morphology characteristics and chemical compositions, the fatigue performances of hydrated lime and cement were better than that of limestone. Compared with Nf50, the fatigue life meaning of NDER was clearer, the numerical value was easier to determine, and the obtained fatigue life loading times were smaller. The use of NDER in asphalt pavement structure design and material selection is safer, so it is recommended to adopt NDER for the analysis of the fatigue life of mortar. |
| Key words: inorganic micro-powder particle size asphalt mortar fatigue performance SEM |
