What test must be conducted for aggregate soundness, according to the Quality Control Program?

The Magnesium Sulfate Soundness test is essential for assessing the durability and long-term performance of aggregates. This test measures the ability of aggregates to withstand the effects of weathering, particularly the forces that may cause them to disintegrate. During the test, aggregates are subjected to cycles of soaking in a magnesium sulfate solution followed by drying, simulating the conditions that lead to soundness deterioration in real-world applications.

By evaluating the degradation of aggregates under these conditions, the Magnesium Sulfate Soundness test helps ensure that the materials used in construction projects can withstand environmental challenges. This performance characteristic is crucial in selecting aggregates for applications like pavement, where durability is paramount to long-term functionality and safety. Other tests mentioned, such as LA Abrasion Resistance, Gradation Test, or Plasticity Index Test, focus on different aspects of aggregate performance and do not specifically quantify the soundness or durability against environmental degradation like the Magnesium Sulfate test does.