ASTM D5220/D5220M
Standard Test Method for Water Mass per Unit Volume of Soil and Rock In-Place by the Neutron Depth Probe Method
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About This Item
ASTM D5220/D5220M is the ASTM standard for measuring water mass per unit volume of soil and rock in place by the neutron depth probe method. It provides a technical basis for assessing moisture conditions directly within subsurface materials, which can support field testing, quality control, and engineering decisions. By defining a consistent approach, this standard helps users evaluate in-place water content more reliably for geotechnical and construction-related work.
What is ASTM D5220/D5220M?
This standard describes a test method for determining water mass per unit volume of soil and rock in place using a neutron depth probe. The method is intended for field measurement where direct evaluation of subsurface moisture is needed. ASTM D5220/D5220M is commonly used as a technical reference when organizations need a consistent, recognized procedure for in-place moisture assessment. As an ASTM standard, it supports repeatable testing and helps align measurement practices across projects and teams.
Where is ASTM D5220/D5220M used?
ASTM D5220/D5220M is used in field settings where soil and rock moisture conditions must be checked at depth. It is relevant to geotechnical investigation, earthwork verification, site characterization, and other workflows involving in-place material testing. The standard is typically associated with neutron probe equipment and field testing programs that need a recognized method for measuring water mass per unit volume. Its use is especially practical when consistent moisture data is needed for engineering review or construction oversight.
Why is ASTM D5220/D5220M important?
This standard matters because it helps create a common testing framework for measuring moisture in soil and rock where conditions can vary significantly from one location to another. ASTM D5220/D5220M supports better consistency in field results, which can improve comparison between tests and reduce uncertainty in project decisions. It is also useful for compliance, procurement, and quality control when a documented, recognized method is needed for evaluating in-place water content.
- In-place moisture measurement
- Neutron depth probe method
- Soil and rock testing
- Field quality control support
- Recognized ASTM test method
- Publication Date: 2021-05-20
- Publisher: ASTM
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