玻璃纤维粉高黏超薄沥青磨耗层技术研究

Research on Glass Fiber Powder High-viscosity Ultra-thin Asphalt Wear Layer Technology

摘要:

以广东省江罗高速公路养护改造为背景，研究设计特定配合比的高黏超薄沥青磨耗层。为了改善超薄磨耗层的结合料粘结集料的能力，使磨耗层结构更稳定，集料不易脱落，延长路面使用寿命，选择掺量为4%的SBS改性剂及掺量为3%、4%、5%的玻璃纤维粉，进行研究分析及路用性能试验。试验结果显示玻璃纤维粉的掺入有效提升了超薄沥青磨耗层的黏度及路用性能，当玻璃纤维粉掺量为5%时，超薄沥青磨耗层60 ℃动力黏度比掺量为3%时提升了75.1%，而且路用性能试验结果均满足现行规范要求。综上所述，当SBS改性剂掺量为4%时，玻璃纤维粉最佳掺量为5%。为养护改造工程提供一些相关的建议及试验数据作为参考。

Abstract:

Taking the maintenance and reconstruction of the Jiangluo Expressway in Guangdong Province as the background, a high-viscosity ultra-thin asphalt wear layer with a specific mix ratio is studied and designed. To improve the ability of the ultra-thin wear layer binder to bond the aggregate, to make the structure of the wear layer more stable, the aggregate not easy to fall off， and the service life of the pavement extended， the SBS modifier with a dosage of 4% and the glass fiber powder with dosages of 3%, 4% and 5% are selected for the research analysis and pavement performance testing. The testing results show that the addition of glass fiber powder effectively improves the viscosity and pavement performance of the ultra-thin asphalt wear layer. When the glass fiber powder content is 5%, the dynamic viscosity of the ultra-thin asphalt wear layer at 60 ℃ is increased by 75.1% compared to when the content is 3%. Moreover, the pavement performance test results all meet the current standard requirements. In summary, when the SBS modifier dosage is 4%, the optimal dosage of glass fiber powder is 5%. Some correlative suggestions and experimental data are provided as the reference for the maintenance and reconstruction projects.