Improving Field Moisture Monitoring of Recycled and Virgin Aggregates
Improving Field Moisture Monitoring of Recycled and Virgin Aggregates
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DOI：
10.1177/03611981231165758
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发表时间：
2023-05
影响因子：
1.7
通讯作者：
Ceren Aydin;R. Velasquez;B. Izevbekhai;B. Cetin
中科院分区：
文献类型：
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作者：
Ceren Aydin;R. Velasquez;B. Izevbekhai;B. Cetin
路面地基的结构承载力会因湿度条件而改变。在整个路面使用寿命期间对岩土材料进行可靠的水分监测对于运输机构的资产管理至关重要。改进的湿度传感使运输官员和从业人员能够更好地了解复杂回收材料在频繁的极端降雨事件下的性能。尽管地质材料的湿度传感已经有了显著的改进，但在可能含有未水合水泥、老化沥青或两者的回收材料中使用传感器时仍然存在挑战。挑战包括开发校准功能，说明回收材料的存在和可靠的安装程序，因为技术主要是为农业实践开发的。在这项研究中，进行了一系列的实验，以建议改进安装技术和数据解释的土壤水分和水势传感器。建议的安装指南最大限度地减少土壤传感器接口处的冲刷和侵蚀可能性。实验结果表明，再生材料的介电常数和水含量之间的强双线性关系，与相对较小的变化区域由空气的介电常数和水的介电常数控制的快速变化的区域。此外，据发现，介电常数是不显着影响骨料内部结构的介电为特定的水分含量为不同的压实度是相对相似的。此外，土壤水分特征曲线得到使用水势传感器和改进的安装技术比较合理，以及与传统设备得到的实验室结果。水分和水势传感器的可靠性提高了建议的准则。
The structural capacity of pavement foundation is altered by moisture conditions. Reliable moisture monitoring of geomaterials throughout pavement service life is critical for asset management by transportation agencies. Improved moisture sensing enables transportation officials and practitioners to better understand performance of complex recycled materials under frequent extreme rain events. Although moisture sensing for geomaterials has improved significantly, there are still challenges when using sensors in recycled materials that may contain unhydrated cement, aged asphalt, or both. Challenges include the development of calibration functions that account for the presence of recycled materials and robust installation procedures, as technology was developed mostly for agricultural practices. In this study, a series of experiments were conducted to suggest improvements for installation techniques and data interpretation of soil moisture and water potential sensors. Suggested installation guidelines minimize wash-out and erosion potential at the soil–sensor interface. Experimental results indicate a strong bilinear relation between dielectric of recycled materials and water content, with a region of relatively small change governed by dielectric permittivity of air and a region of rapid change controlled by dielectric permittivity of water. Moreover, it was found that dielectric permittivity is not significantly affected by aggregate internal structure as dielectric for a specific moisture content for different compaction degrees is relatively similar. Furthermore, soil water characteristic curves obtained using the water potential sensor and improved installation technique compare reasonably well with laboratory results obtained with traditional equipment. Reliability of both moisture and water potential sensors was improved with the suggested guidelines.