ASTM C1293
Full Name
ASTM C1293 – Standard Test Method for Determination of Length Change of Concrete Due to Alkali-Silica Reaction
Scope
ASTM C1293 is a standard test method used to determine the susceptibility of an aggregate or combination of aggregates with pozzolan or slag to alkali-silica reaction (ASR) in concrete. ASR is a chemical reaction that can cause deleterious expansion and cracking in concrete structures.
The scope of ASTM C1293 includes:
- Determining susceptibility: the test method assesses the potential of an aggregate or aggregate combination to participate in expansive alkali-silica reaction. This is done by measuring the length change of concrete prisms over time.
- Concrete with alkali content: the test method is intended for evaluating the behavior of concrete with an alkali content of 4.5 lb/yd3 (2.7 kg/m3) or greater, calculated as the equivalent Na2O content of the cement.
- Concrete prisms: it involves the preparation and testing of concrete prisms made with the aggregate under investigation. The prisms are stored in a solution of 1 M sodium hydroxide (NaOH) at 80°C to accelerate the alkali-silica reaction.
- Monitoring length change: the length change of the concrete prisms is carefully monitored over a specified period, typically 1 year. Excessive expansion indicates a potential for harmful ASR.
- Evaluation criteria: the standard provides criteria for evaluating the potential alkali reactivity of the aggregate based on the measured length change.
In summary, ASTM C1293 provides a standardized method for assessing the potential of aggregates and aggregate combinations to contribute to alkali-silica reaction (ASR) in concrete. This information is crucial for selecting suitable aggregates and designing durable concrete structures that can resist the damaging effects of ASR.
ASTM C1293 Accredited Laboratory
Applied Testing & Geosciences, LLC is accredited for performing tests using the ASTM C1293 standard.
Contact us for more information.
Resources
Keywords
alkali-silica reaction; concrete prisms; length change; expansion; aggregates; sodium hydroxide solution; deleterious expansion; alkali reactivity; potential reactivity