SBIR PHASE II: An In Situ Process Control Device for Asphalt Pavements

* 9800895皮尔逊 这个小型企业创新研究第二阶段项目将开发和测试基于核磁共振（nmr）的沥青骨料混合料过程控制设备。 第一阶段的研究展示了硬件的改进，包括Halbach偶极磁体的匀场系统，使实验室和在线仪器成为可能。 该实验室将能够测量沥青的物理性能在纯沥青混合料在很大的温度范围。 在线装置将导致沥青过程控制在热拌厂和铺路现场。 将设计一个现场装置，并在现场路面上进行测试。 该公司之前的工作证明了沥青与骨料混合时物理性质如何变化，以及如何用核磁共振测量这些变化，以确定混合物中的“游离沥青”。 这种游离沥青可能对路面物理和使用性能产生重要影响。 这可能最终导致仪器的发展，可以测量路面沥青的数量和物理性能，而无需从路面上取下样品。 这项技术的商业应用存在于沥青实验室，热拌厂和现场路面。 在食品加工中也有应用。 ***

*** 9800895 Pearson This Small Business Innovation Research Phase II project will develop and test nuclear magnetic resonance (nmr) based process control devices for asphalt-aggregate mixes. The Phase I research demonstrated how hardware improvements, including a shim system for a Halbach dipole magnet, makes laboratory and on-line instrumentation possible. The laboratory unit will be able to measure asphalt physical properties in neat asphalt in mixes over a wide range of temperatures. The on-line unit will lead to asphalt process control in a hot mix plant and at paving sites. An in situ device will be designed and tested on in-place pavement. Previous work by the firm demonstrated how asphalt physical properties change when mixed with aggregate and how these changes can be measured with nmr to determine what is defined as "free asphalt" in a mix. This free asphalt probably has an important impact on pavement physical and use properties. This could eventually lead to the development of instrumentation that can measure the amount and physical properties of asphalt in pavements without removing a sample from the pavement. Commercial applications for this technology exist in asphalt laboratories, hot mix plants and in-place pavements. Applications also exist in food processing. ***