Astm D338518 Pdf Jun 2026
Used for constant-head tests to automatically maintain a fixed water level in both rings.
Permeability testing is essential in assessing the performance of porous concrete, as it directly affects the material's ability to withstand environmental factors, such as rainfall, flooding, and groundwater. The permeability of porous concrete is influenced by several factors, including the type of aggregate used, the mixture design, and the compaction process. By measuring the permeability of porous concrete, engineers and contractors can:
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Indicates the standard was approved or last revised in 2018.
The infiltration rate computed for a specific, short time interval during the test.
The standard outlines specific dimensions and steps to ensure test repeatability and accuracy. 1. Equipment Specifications Typically 30 cm (12 inches) in diameter. Outer Ring: Typically 60 cm (24 inches) in diameter. Used for constant-head tests to automatically maintain a
Once the test begins, record the volume of liquid used to maintain the constant water level in the inner ring at regular time intervals. Common intervals range from 5 to 15 minutes, depending on the speed of infiltration.
The test runs continuously until the infiltration rate stabilizes into a steady state (where the volume consumed per unit of time becomes nearly constant). Mathematical Calculation The infiltration rate (
Fill both the inner and outer rings with water simultaneously. It is critical to maintain roughly equal water levels in both rings throughout the test to prevent lateral pressure differentials. By measuring the permeability of porous concrete, engineers
To quantify the flux of water moving vertically into the soil profile under steady-state conditions.
: Evaluating potential septic-tank absorption fields and liquid waste disposal zones.
cm/s), engineers must reference the sealed-inner ring technique outlined in instead. 2. Infiltration vs. Hydraulic Conductivity
Understanding how water moves through soil is critical for civil engineering, hydrology, and agricultural projects. The standard framework for measuring this movement is . This document establishes the professional protocol for using a double-ring infiltrometer to determine the in-situ infiltration rate of soils. Engineers, environmental scientists, and regulatory bodies rely on this test to collect accurate data for design and environmental compliance. What is ASTM D3385-18?
