Which requirements must concrete meet in highway construction?

Concrete used in highway construction must meet ASTM (American Society for Testing and Materials) requirements because these standards provide a comprehensive set of protocols and specifications for the quality, performance, and testing of materials used in construction. ASTM standards are widely accepted in the United States and are crucial in ensuring that concrete achieves the necessary strength, durability, and workability to withstand the demands of highway infrastructure.

Adhering to ASTM standards helps ensure that the concrete mix design is appropriate for specific environmental and load conditions, ultimately leading to safer and more durable roads. This focus on standardization in testing and material performance allows for consistent quality across projects and can be critical during inspections and certifications in highway construction.

While other options may represent important guidelines or requirements in various contexts, ASTM standards are specifically tailored to address the characteristics and testing of construction materials, including concrete, making them the most relevant choice in this scenario.