ASTM C426
Full Name
ASTM C426 – Standard Test Method for Linear Drying Shrinkage of Concrete Masonry Units
Scope
ASTM C426 covers a standardized procedure for determining the linear drying shrinkage of concrete masonry units and related concrete units. This test measures the change in linear dimension of a specimen due to drying from a saturated condition to an equilibrium weight and length under specified accelerated drying conditions.
The scope of ASTM C426 includes:
- Test method: the standard outlines the detailed procedure for conducting the drying shrinkage test, including specimen preparation, measurement techniques, and environmental conditions.
- Units: it is applicable to various concrete masonry units and related concrete units, such as concrete bricks and blocks.
- Accelerated drying: the test method employs accelerated drying conditions to expedite the shrinkage process and obtain results within a reasonable timeframe.
- Significance and use: the results of this test are used to evaluate the drying shrinkage characteristics of a given unit. This information is essential for predicting the potential for cracking in concrete masonry constructions and designing appropriate crack control measures.
Limitations: the standard acknowledges that the test method only measures shrinkage due to drying and does not account for other factors that can influence shrinkage, such as carbonation and temperature changes.
In essence, ASTM C426 provides a standardized approach for assessing the drying shrinkage potential of concrete masonry units, enabling engineers and designers to make informed decisions regarding material selection and construction practices to minimize the risk of cracking.
ASTM C426 Accredited Laboratory
Applied Testing & Geosciences, LLC is accredited for performing tests using the ASTM C426 standard.
Let us help you assess the drying shrinkage characteristics of your concrete masonry units. Contact us today to learn more about our testing capabilities and how we can support your quality control efforts.
Resources
Keywords
drying shrinkage; concrete masonry units; length change; accelerated drying; comparator; strain gage