改性沥青磨耗层性能及施工研究

Research on Performance and Construction of Modified Asphalt Wear Layer

摘要:

依托福建省尤溪县洋中镇洋桂线（X731）路面品质提升工程，针对当地环境气候和旅游景区快速开放交通的需求，开展了改性沥青超薄磨耗层性能及施工工艺的研究。首先，通过马歇尔试验确定了玄武岩纤维最佳掺量为沥青混合料质量的0.20%；然后，将废轮胎橡胶粉分别以5%、7%、9%、11%的掺量掺入混合料并进行路用性能试验。试验结果显示：混合料高温稳定性随着橡胶粉掺量的增加而增强，但当掺量大于9%后，混合料低温抗裂性和水稳定性呈现下降趋势；玄武岩纤维与橡胶粉的协同作用可提升混合料性能。在性能试验的基础上，采用SBS改性非乳化不粘轮粘层油施工工艺进行试验段的铺筑，检测结果显示，试验段各项指标均符合规范要求，说明该施工工艺能有效控制层间温度，保证结构层结合质量，提升道路整体性。

Abstract:

Based on the pavement quality improvement project of Yanggui Line (X731) in Yangzhong Town, Youxi County, Fujian Province, the performance and construction technology of modified asphalt ultra-thin wear layer are studied in response to the local environmental climate and the demand for rapid traffic opening in tourist attractions. Firstly, the Marshall test is carried out to determine that the optimal dosage of basalt fiber is 0.20% of the mass of asphalt mixture, and then, the waste tire rubber powder is added into the mixture at dosages of 5%, 7%, 9% and 11% respectively, and the pavement performance tests are conducted. The experimental results show that the high-temperature stability of the mixture increases with the increase of rubber powder content, but when the content exceeds 9%, the low-temperature crack resistance and water stability of the mixture show a decreasing trend. And the synergistic effect of basalt fiber and rubber powder can enhance the performance of the mixture. On the basis of performance testing, the independently developed SBS modified non-emulsified non-stick wheel adhesive layer oil construction process is used for the paving of the test section. The test results show that all indicators of the test section meet the specification requirements, indicating that the construction process can effectively control the interlayer temperature, ensure the bonding quality of structural layer, and improve the road integrity.