Measure the drop in water level over specific time intervals.
Serves as the actual measurement zone. Because lateral flow is restricted by the outer ring's buffer, the water drop in the inner ring reflects true, one-dimensional vertical infiltration. Technical Specifications and Apparatus
Polybutadiene rubber (BR) is a synthetic rubber used in various applications, including tire manufacturing, industrial products, and consumer goods. The ASTM D3385 standard provides a framework for evaluating the properties of BR to ensure its quality and performance.
Geotextiles are used in a wide array of applications, from road construction and coastal protection to landfill engineering and hydraulic structures. Their primary function is to improve the stability and performance of soil structures by providing filtration, separation, reinforcement, and protection. Given their critical role, it's essential to understand and accurately predict their behavior under various conditions, including hydraulic flow and soil interaction.
When water infiltrates the ground, it tends to spread out laterally due to capillary forces and soil suction, not just downward via gravity. If you were to use a single ring, this lateral "edge effect" would lead to artificially high infiltration rate readings. By using two concentric rings: astm d338518 pdf
: The volume of liquid added to the inner ring to maintain a constant water level over time.
To achieve a steady-state infiltration rate, the soil often needs to be pre-wetted. Water is added to both the inner and outer rings simultaneously, maintaining an equal fluid level in both. 4. Taking Measurements (Constant Head vs. Falling Head)
Why do engineers and scientists go through the rigorous process of performing this field test? The data yielded by ASTM D3385-18 serves multiple critical functions across various disciplines:
Understanding ASTM D3385-18: The Standard Guide for Infiltration Rate of Soils Using Double-Ring Infiltrometer Measure the drop in water level over specific time intervals
The volume of water entering the soil per unit area per unit time, typically expressed in inches per hour (in/hr) or centimeters per hour (cm/hr).
: The standard discusses the importance of pore size distribution in geotextile applications and how it influences the selection of geotextiles for specific projects.
Extremely coarse gravels or rocky soils where driving the steel cylinders without creating severe sidewall leakage gaps is impossible. Highly pervious zones with a hydraulic conductivity ( ) greater than m/s, or highly impervious zones where m/s. For soils with very low hydraulic conductivity (
Fill both rings with the test liquid (water) until a constant level is achieved, typically aiming for about 0.1 m (4 in.) of ponded water. Their primary function is to improve the stability
Procedure (condensed, practical steps)
The soil surface is cleaned of debris, and the rings are driven into the ground using a driving cap and hammer (or a jack in stiff soils).
I=ΔVA⋅Δtcap I equals the fraction with numerator cap delta cap V and denominator cap A center dot delta t end-fraction
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