摘要: |
The aggregate industry has a number of concerns with regard to the use of aggregates, including those synthesized from mineral or other sources, in the construction of transportation facilities. The issues of concern include aggregate properties, mineralogy, physical and chemical characteristics, degradation, testing for quality control, quality assurance, sources of current and future supply, production, distribution, environmental and safety consequences of production and distribution operations, and subsequent uses of the land after depletion of aggregate resources. These issues are salient for both the current state of the practice and future directions of the aggregate industry. |