ASTM C1012
Full Name
ASTM C1012 – Standard Test Method for Length Change of Hydraulic-Cement Mortars Exposed to a Sulfate Solution
Scope
ASTM C1012 is a standard test method used to determine the length change of mortar bars when immersed in a sulfate solution. The test aims to assess the sulfate resistance of mortars made using:
- Portland cement
- Blends of portland cement with pozzolans or slags
- Blended hydraulic cements
Key aspects covered by ASTM C1012:
- Specimen preparation: mortar bars are prepared according to specific proportions and cured under controlled conditions before being immersed in the sulfate solution.
- Sulfate solution: the standard specifies the use of a sodium sulfate solution with a specific concentration and pH range.
- Exposure and measurement: mortar bars are immersed in the sulfate solution for a designated period, and their length changes are measured at specific intervals.
- Significance: this test method helps evaluate the potential for sulfate attack, a chemical reaction that can cause expansion and cracking in concrete structures exposed to sulfate-rich environments. The results provide valuable information for selecting suitable cement types and mix designs for sulfate-resistant concrete.
Limitations:
- The test method does not simulate all real-world exposure conditions, and the results may not perfectly predict long-term performance in the field.
- Other factors, such as temperature, humidity, and the presence of other aggressive chemicals, can also influence the sulfate resistance of concrete.
ASTM C1012 Accredited Laboratory
Applied Testing & Geosciences, LLC is accredited for performing tests using the ASTM C1012 standard.
Contact us today to learn more about our testing capabilities and how we can support your business.
Resources
Keywords
sulfate resistance; length change; mortar bars; sulfate solution; portland cement; blended hydraulic cement; pozzolan; slag; expansion; sodium sulfate; comparator; curing