ASTM C1105 is a technical test method for measuring the length change of concrete due to alkali-carbonate rock reaction. It is used to assess a potential expansion-related durability concern in concrete containing certain carbonate aggregates. By providing a standardized way to evaluate length change, this ASTM standard helps support more consistent testing, comparison of results, and informed material selection for concrete applications where reactive aggregate behavior may matter.

What is ASTM C1105?

ASTM C1105, titled Standard Test Method for Length Change of Concrete Due to Alkali-Carbonate Rock Reaction, defines a laboratory approach for observing dimensional change in concrete associated with this reaction. The standard is focused on a specific durability mechanism rather than general concrete performance. In practice, it gives users a common technical basis for measuring expansion behavior and comparing results in a controlled, repeatable way. ASTM C1105 is therefore useful when evaluating concrete made with aggregate sources that may warrant closer review.

Where is ASTM C1105 used?

This standard is commonly used in concrete testing and materials evaluation workflows, especially when aggregate sources are being reviewed for possible alkali-carbonate rock reaction behavior. It may be applied in laboratories supporting project specifications, supplier qualification, or quality control programs where concrete durability is a concern. ASTM C1105 is also relevant when engineers, producers, or owners need a standardized test method to help assess whether a concrete mixture could experience undesirable length change over time.

Why is ASTM C1105 important?

ASTM C1105 matters because it helps create a consistent basis for evaluating a specific durability risk in concrete. Standardized length-change testing supports better comparison of materials, more reliable documentation, and clearer decision-making during procurement and engineering review. It can also help reduce uncertainty when assessing aggregate suitability and potential expansion behavior. For organizations working on compliance, quality control, or product evaluation, ASTM C1105 provides a focused technical reference for a well-defined test method.

• Length change measurement
• Alkali-carbonate rock reaction
• Concrete durability evaluation
• Aggregate-related testing
• Quality control support