Aggregates to be utilized in hot mix asphalt (HMA) must be both tough and durable. Aggregates must withstand the effects of HMA production, transportation, and construction. Additionally, once placed on the roadway, aggregates must also resist the effects ...

The United States Department of Health, Education, and Welfare's National Institute for Occupational Safety and Health (NIOSH) is responsible for conducting research and developing educational and training materials in the field of occupational safety and ...