Which type of water is suitable for producing concrete according to ASTM standards?

The suitable type of water for producing concrete according to ASTM standards is potable water. Potable water is defined as water that is safe for human consumption and typically meets stringent quality standards. This is crucial for concrete production because the quality of water used can significantly impact the strength and durability of the final concrete mix.

Using potable water ensures that there are no harmful substances or contaminants that could interfere with the hydration process of the cement or adversely affect the concrete's properties. ASTM C94, which governs ready-mixed concrete, specifies that water used in making the concrete should be clean and free from harmful chemicals or impurities.

While other types of water, such as recycled water or tap water, may also be suitable under certain conditions, potable water is the most universally accepted standard that guarantees the necessary quality for concrete. This helps ensure that the concrete adheres to the required performance specifications and is durable over its intended lifespan.