Astm D338518 Pdf Jun 2026

Conducting a test compliant with ASTM D3385-18 requires a specific toolkit designed to maintain physical and hydraulic integrity in the field:

ASTM D3385-18 establishes a standard field method using a double-ring infiltrometer to determine the water infiltration rate of soils. It is designed for assessing water movement in unsaturated, fine-grained soils for environmental and engineering projects, excluding highly pervious, impervious, or frozen materials. The full technical specification is available through ASTM International or authorized distributors. The University of Utah

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Because the lateral flow requirement is met by the outer ring, the water infiltrating from the inner ring is forced to move almost exclusively in a true vertical direction.

The "double-ring" design is critical for accuracy because it forces water in the inner ring to flow . The outer ring acts as a buffer, saturating the surrounding soil to prevent lateral (sideways) spreading from the inner measurement area. Requirement under ASTM D3385-18 Method Constant Head Method (water level is kept steady) Ring Depth Driven typically to 150 mm (6 inches) Measurement Conducting a test compliant with ASTM D3385-18 requires

The is the core apparatus. It consists of two concentric metal rings driven into the soil. Water is maintained at a constant level in both rings. The inner ring measures the vertical infiltration rate, while the outer ring creates a buffer zone to minimize lateral spread of water, ensuring that flow in the inner ring is predominantly one-dimensional (vertical).

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Acts as a buffer zone. It saturates the surrounding soil and forces the water in the inner ring to flow strictly downward.

This method is applicable to many soil types but might be challenging in extremely rocky or highly permeable soils.

I=VA×Δtcap I equals the fraction with numerator cap V and denominator cap A cross delta t end-fraction

The ASTM D3385-18 test method involves a simple and straightforward procedure to measure the permeability of porous concrete. The test apparatus consists of: