What type of tests are conducted to ensure aggregates meet environmental specifications?

Leaching analysis and resilience testing are crucial tests conducted to ensure aggregates meet environmental specifications. Leaching analysis helps to assess the potential leaching of harmful substances from aggregates into the environment, ensuring that materials used in construction do not pose ecological risks. This is especially important for materials that may interact with groundwater or soil. Resilience testing, on the other hand, evaluates the ability of aggregates to withstand environmental stressors, such as freeze-thaw cycles, which can affect durability and long-term performance.

The other options, while they include important testing aspects, do not specifically focus on environmental specifications as directly as leaching analysis and resilience testing. Physical strength tests and color analysis primarily address the structural properties and visual characteristics of aggregates rather than their environmental impact. Visual inspections and density tests mostly pertain to quality control and aggregate characteristics, while moisture retention tests and temperature checks are more about performance conditions rather than environmental compliance. Therefore, the most relevant option concerning environmental specifications is the combination of leaching analysis and resilience testing.