市政桥梁热拌环氧沥青铺装材料与施工质量控制参数研究

Study on Hot-Mixed Epoxy Asphalt Paving Materials and Construction Quality Control Parameters for Municipal Bridges

摘要:

针对市政桥梁铺装耐久性不足、服役寿命低的核心瓶颈问题，开发了“热拌环氧沥青混合料EA10+热拌环氧沥青间断级配混合料EPSMA10”铺装体系。研究围绕关键材料性能、施工质控参数等方面进行。结果表明：环氧沥青结合料、环氧树脂黏结剂等核心材料技术性能均达标，EA10和EPSMA10路用性能优良；明确钢板喷砂除锈清洁度Sa3.0级、粗糙度80~150 μm，以及黏结剂搅拌时间120 s、养生时间24~36 h等施工参数；确定摊铺松铺系数1.2，温度阈值160 ℃；构建了碾压“温度—风速—铺面状态”三因素协同调控方法，以风速4.5 m/s为阈值提出了差异化碾压方案；明确EA10养生4 d可开展后续工序，EPSMA10养生10 d可开放交通。研究成果为提升铺装施工质量提供关键技术支撑。

Abstract:

To address the core bottleneck of insufficient durability and short service life of municipal bridge pavements, a paving system comprising hot-mixed epoxy asphalt mixture EA10 and hot-mixed epoxy asphalt gap-graded mixture EPSMA10 has been developed. The research focuses on the key material properties, construction quality control parameters and other relevant aspects. The results indicate that the technical performances of core materials such as epoxy asphalt binder and epoxy resin adhesive all meet the standards, and both EA10 and EPSMA10 exhibit the excellent pavement performances. The construction parameters are clarified that the cleanliness of steel plates after sandblasting and derusting is Sa3.0 grade, a roughness is 80~150 μm, the adhesive mixing time is 120 s and the curing time is 24~36 h. It is determined that the loose paving coefficient for paving is 1.2, and a temperature threshold is 160°C. A three-factor collaborative control method for compaction is established, which three factors are temperature, wind speed and pavement condition. A differentiated compaction scheme is proposed with a wind speed threshold of 4.5 m/s. It is clear that subsequent construction procedures can be carried out after EA10 is cured for 4 d, and that the traffic can be open after EPSMA10 is cured for 10 d. The research results provide the key technical support for improving the paving construction quality.