高速公路面层病害快速修补型半柔性材料研究

Study on Rapid-repair Semi-flexible Materials for Pavement Diseases of Expressways

摘要:

为解决传统半柔性材料在高速公路面层病害修复中施工效率低、早期强度不足、高温稳定性差的问题，实现病害快速耐久修复，开展快速修补型半柔性材料的组分设计、性能优化及施工工艺简化研究。采用 4.75~9.5 mm单粒径石灰岩集料制备冷补料，选用掺量均为水泥质量5%的聚氨酯与河沙复合改性快凝水泥灌浆料，通过动稳定度试验、马歇尔试验等验证材料性能，同步简化施工流程。优化后材料动稳定度达13 000 次/mm，较规范要求提升225%；马歇尔稳定度为29 kN，较规范要求提高93.3%；灌浆料养生30 min抗压强度达设计强度80%，满足半小时开放交通需求。简化后的施工工艺无需大型设备，1.5 h内可完成修复作业，为高速公路面层病害快速耐久修复提供技术支撑。

Abstract:

To address the issues of low construction efficiency, insufficient early strength and poor high-temperature stability of traditional semi-flexible materials in the repair of expressway pavement distresses, and realize the rapid and durable repair of diseases, the research is conducted on the component design, performance optimization and construction process simplification of rapid-repair semi-flexible materials. The single-particle size limestone aggregates of 4.75~9.5 mm is used to prepare the cold patching materials. The polyurethane and river sand composite modified fast-setting cement grouting material with a dosage of 5% of the cement mass is selected. The material performance is verified through dynamic stability tests, Marshall tests and other methods, and the construction process is simplified simultaneously. The dynamic stability of the optimized material reaches 13 000 times/mm, being 225 % higher than the specification requirements. The Marshall stability reaches 29 kN, being 93.3% higher than the standard requirements. The compressive strength of the grouting material after 30 minutes of curing reaches 80% of the designed strength, meeting the requirement of opening traffic for half an hour. The simplified construction process does not require large-scale equipment, enabling the completion of repair work within 1.5h, providing the technical support for the rapid and durable repair of expressway pavement distresses.