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

这个小企业创新研究二期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改进，包括哈尔巴赫偶极磁铁的垫片系统，如何使实验室和在线仪器成为可能。该实验室单元将能够在广泛的温度范围内测量纯沥青混合料中的沥青物理特性。在线单元将导致沥青过程控制在热混合厂和铺装现场。现场装置将在现场路面上设计和测试。该公司之前的工作展示了沥青与骨料混合时物理性质的变化，以及如何用核磁共振测量这些变化，以确定混合物中什么被定义为“自由沥青”。这种游离沥青可能对路面的物理和使用性能有重要影响。这可能最终导致仪器的发展，可以测量沥青在路面的数量和物理性质，而不需要从路面上取下样本。这项技术的商业应用存在于沥青实验室、热混合厂和就地路面。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. ***