多维度无损检测技术在SMA路面施工质量控制的应用

Application of Multi-dimensional Non-destructive Testing Technology in Quality Control of SMA Pavement Construction

摘要:

为解决SMA混合料施工过程中的质量波动问题，引入了红外热成像探测系统、三维探地雷达系统、无核密度仪等多维度无损检测技术，以黄茅海通道项目为例，分别从SMA-13生产过程、摊铺、碾压及工后检测环节开展质量控制要点的应用研究。结果表明：基于拌和楼物料数据统计分析方法评估拌和楼计量系统的精准度，使用红外热成像系统监控沥青混合料出厂、运输、摊铺等环节的温度离析，可以有效保障SMA混合料生产过程的稳定性；根据无核密度仪研究的碾压环节混合料压实度变化规律，推荐了SMA-13的有效碾压工艺组合，该组合可使路面压实质量提升超过15%；使用三维探地雷达开展混合料初始压实度变化对厚度合格率的影响研究，发现当SMA混合料初始压实度为90%以上时，混合料预压密实，碾压沉降量一致，可以实现沥青层厚度合格率99%以上。

Abstract:

To solve the quality fluctuation problem during the construction process of SMA mixture, the multi-dimensional non-destructive testing technologies such as infrared thermal imaging detection system, three-dimensional ground-penetrating radar system and nuclear-free density meter are introduced. Taking the Huangmaohai Channel Project as an example, the application research on key points of quality control is carried out respectively from the production process, paving, rolling compaction and post-construction inspection links of SMA-13. The results show that evaluating the accuracy of the measurement system of the mixing plant based on the statistical analysis method of material data of the mixing plant and using the infrared thermal imaging system to monitor the temperature segregation in the links of asphalt mixture leaving the factory, transportation and paving can effectively guarantee the stability of the SMA mixture production process. The variation law of the compaction degree of the mixture in the rolling compaction process is studied by using a nuclear-free density meter. The effective rolling compaction process combination of SMA-13 is recommended. This combination can make the compaction quality of the pavement improved by more than 15%. The influence of the initial compaction degree change of the mixture on the qualified rate of thickness is studied by using three-dimensional ground-penetrating radar. It is found that when the initial compaction degree of SMA mixture is above 90%, the pre-compacted mixture is dense and the rolling compaction settlement is consistent, which can achieve an asphalt layer thickness qualification rate of over 99%.