It represents all five transportation modes: air, highways, public transportation, rail, and water. The American Association of State Highway Officials (AASHTO) is a nonprofit, nonpartisan association representing highway and transportation departments in the 50 states, the District of Columbia, and Puerto Rico. The organization’s purpose is the development of voluntary consensus standards for materials, products, systems, and services. 2 Today it is recognized as a worldwide nonprofit organization whose membership is composed of representative users, producers, and general interest groups. The American Society for Testing and Materials (ASTM) was established in 1898 by chemists and engineers of the Pennsylvania Railroad. American Association of State Highway Officials (AASHTO).American Society for Testing and Materials (ASTM).Most agencies follow the standard test procedures for aggregate established by: 6 California Department of Transportation. ![]() Several agencies have established standards for aggregate used in construction. ![]() Every potential production site must be tested to ensure that the materials meet specifications for a particular application and to determine processing requirements. All aggregate used for construction purposes must be tested, physically and chemically, to verify its suitability for these uses. Aggregate is the main ingredient in Portland Cement Concrete and Asphalt Concrete.
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