ASTM C1506
Full Name
ASTM C1506 – Standard Test Method for Water Retention of Hydraulic Cement-Based Mortars and Plasters
Scope
ASTM C1506 outlines a test method for determining the water retention of hydraulic cement-based mortars and plasters. Water retention is the ability of a mortar or plaster to hold water under suction, which is crucial for proper hydration and bonding to the substrate.
The scope of ASTM C1506 includes:
- Test Method: the standard provides a detailed procedure for measuring the water retention of mortars and plasters. The test involves determining the flow of the mortar/plaster before and after subjecting it to a controlled vacuum suction. The water retention is calculated as the ratio of the final flow to the initial flow, expressed as a percentage.
- Materials: the test method is applicable to hydraulic cement-based mortars and plasters, including those containing portland cement, blended cement, masonry cement, or mortar cement.
- Significance and use: the water retention value obtained from this test method provides insights into the following aspects:
- Workability: mortars and plasters with higher water retention are generally easier to work with and less prone to drying out too quickly.
- Bond strength: adequate water retention is important for developing good bond strength between the mortar/plaster and the substrate.
- Shrinkage: mortars and plasters with poor water retention may experience excessive shrinkage, leading to cracking and other defects.
- Compliance with specifications: the test results can be used to verify if the mortar or plaster meets the water retention requirements specified in project specifications.
In essence, ASTM C1506 provides a standardized method for evaluating the water retention of hydraulic cement-based mortars and plasters. This information is valuable for selecting suitable materials, optimizing mix designs, and ensuring the long-term performance and durability of masonry and plastering work.
ASTM C1506 Accredited Laboratory
Applied Testing & Geosciences, LLC is accredited for performing tests using the ASTM C1506 standard.
Contact us today to learn more about our testing capabilities and how we can support your business.
Resources
Keywords
water retention; hydraulic cement; mortars; plasters; flow; vacuum suction; workability; bond strength; shrinkage