Astm D338518 Pdf Patched | Must See

: A typical setup uses a 12-inch (30 cm) inner ring and a 24-inch (60 cm) outer ring. Scope and Applicability

Understanding ASTM D3385-18: Standard Test Method for Infiltration Rate of Soils in Field Using Double-Ring Infiltrometer

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

Key changes between versions primarily involve updates to the hydraulic conductivity thresholds. The 2003 and 2009 versions specified the lower limit for Test Method D5093 as approximately 1 × 10⁻⁶ cm/s. The current 2018 version updated this to 1 × 10⁻⁵ cm/s, reflecting improved understanding of measurement capabilities and better alignment with related standards. astm d338518 pdf

Rings are usually 20 inches (50 cm) high, constructed from heavy-gauge steel or aluminum with a sharpened bottom edge to minimize soil disturbance during installation. 2. Water Supply and Measurement

: The standard becomes unreliable in highly pervious or highly impervious zones. It is limited to soils with a hydraulic conductivity ranging between . For tighter soils (

Depending on your project, other standards may be more appropriate: : A typical setup uses a 12-inch (30

ASTM D3385-18 is primarily designed for soils with a high to moderate permeability profile. It yields the most accurate, reproducible results in: Granular sand Silty sand Loam and sandy loam Peat and highly organic surface soils Critical Limitations

Plotting the infiltration rate against elapsed time yields an infiltration curve. The curve typically drops sharply at the beginning of the test as dry soil matrix suctions pull water in, eventually flattening out into a horizontal line representing the steady-state infiltration rate. Limitations and Practical Considerations

To legally utilize this standard for certified engineering reports, access to the official document is necessary. The full standard includes precise dimensional drawings of the apparatus, data sheet templates, and specific quality assurance controls. The full technical specification is available through ASTM

The document provides pre-formatted, industry-accepted tables and data layouts. These ensure field teams record all mandatory metadata, including soil temperature, water quality profiles, and precise site geometry.

The data collected from the inner ring is used to calculate both the incremental infiltration rate and the cumulative infiltration. Incremental Infiltration Rate The infiltration velocity (

Initially, the curve drops sharply as the soil matrix changes from an unsaturated state to a saturated state (satisfying soil suction forces). Over time, the curve flattens out asymptotically. The point at which the curve becomes horizontal represents the steady-state infiltration rate, which closely mirrors the of the soil layer. 7. Why You Need the Official ASTM D3385-18 PDF

Assessing irrigation requirements and leaching efficiencies.