By understanding the principles and procedures outlined in ASTM D3385-18, professionals in the construction industry can ensure that porous concrete is used effectively and efficiently in a wide range of applications.
Evaluating the suitability of sites for liquid waste or septic systems.
Acts as a buffer zone. It promotes purely vertical water flow beneath the inner ring by saturating the surrounding soil profile.
Why are two rings necessary instead of one? The answer lies in soil physics. astm d338518 pdf
Record the water level or volume consumed at regular, frequent time intervals (e.g., every 5, 10, 15, or 30 minutes).
Thermometers (to record water temperature, as temperature heavily influences fluid viscosity) Step-by-Step Testing Procedure
The is an essential document for geotechnical engineers, environmental consultants, and construction quality control personnel. It provides a standardized, repeatable, and defensible method for measuring soil infiltration rate in the field. By understanding the principles and procedures outlined in
A crucial distinction clarified in the standard is that this test method cannot be used directly to determine the hydraulic conductivity (coefficient of permeability) of the soil. Although the units of infiltration rate and hydraulic conductivity are similar, they represent distinct quantities and cannot be directly related unless the hydraulic boundary conditions—such as hydraulic gradient and the extent of lateral flow of water—are known or can be reliably estimated.
The test continues until the infiltration rate becomes constant. Initially, dry soil will absorb water rapidly due to matric suction. As the soil becomes saturated, the rate decreases and levels off, approaching the saturated hydraulic conductivity ( Ksatcap K sub s a t end-sub ) of the soil. Calculations and Data Interpretation The infiltration rate (
. The primary feature of this method is its use of two concentric rings to isolate vertical flow, providing a more accurate measurement of soil drainage and water management capacity. SCIRP Open Access Core Technical Features One-Dimensional Flow Promotion It promotes purely vertical water flow beneath the
The 2018 revision (D3385-18) clarified procedures for different soil types, added guidance on test duration, and emphasized the importance of maintaining constant head (water depth) during the test. It also addressed common errors: ring-driving disturbance, evaporation, and temperature effects.
Two large reservoirs or carboys capable of maintaining a constant water level (head) inside both rings.
The definitive standard for measuring this property in the field is : Standard Test Method for Infiltration Rate of Soils in Field Using Double-Ring Infiltrometer .