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原文传递 Minnesota Taconite as a Microwave-Absorbing Road Aggregate Material for Deicing and Pothole Patching Applications. Final rept.

题名：	Minnesota Taconite as a Microwave-Absorbing Road Aggregate Material for Deicing and Pothole Patching Applications. Final rept.
作者：	HOPSTOCK, D. M.; ZANKO, L. M.
关键词：	Pavements-; Maintenance-; *Aggregrates-.;Asphalts-; Composites-; Microwave-equipment; Temperature-profiles; Roads-; Deicing-; Potholes-; Heat-capacity; Thermal-conductivity; Hot-mix-paving-mixtures; Repair-; Minnesota-.
摘要：	This report presents modeling of temperature profiles for application of microwaves to pothole patching and roadway deicing. Values of key parameters are estimated and presented for asphalt-aggregate composites containing varying magnetite content (compacted and with voids), ice, and water. The key parameters are: microwave absorption coefficient at 2.45 GHz, density, heat capacity, and thermal conductivity. This reports summarizes the work we were able to complete, including a large number of equations characterizing key parameters and an extensive list of references. The natural magnetite in taconite is an outstanding microwave absorber. Consequently, when a truck-mounted microwave generator is driven over an ice-covered roadway constructed with crushed taconite as the aggregate, the microwaves should pass through the ice and be absorbed as heat at the road-ice interface, allowing the ice to be easily detached and scraped away. This energy-efficient process is the only non-chemical method of deicing practical for many miles of roadway. Adoption of this deicing method could lead to a significant demand for taconite aggregate. The same microwave equipment used for deicing could be used year-round for pothole patching applications, with the microwave energy used to generate just the required amount of hot mix on-site for permanent repairs.
报告类型：	科技报告