ASTM D4543-19 PDF

Full title and description

ASTM D4543-19 — Standard Practices for Preparing Rock Core as Cylindrical Test Specimens and Verifying Conformance to Dimensional and Shape Tolerances. This practice provides laboratory procedures and acceptance checks for converting recovered rock drill core (or block samples) into cylindrical test specimens suitable for strength and deformation testing, and for verifying that specimens meet required dimensional and geometric tolerances.

Abstract

ASTM D4543-19 describes recommended methods for trimming, machining, and inspecting cylindrical rock core specimens so they are suitable for mechanical testing. It defines dimensional limits and shape tolerances (diameter, length-to-diameter ratio, straightness, flatness and parallelism of end surfaces, and perpendicularity to the specimen axis) and outlines when and how to check conformance. The practice also addresses curatorial concerns, moisture condition considerations, and exceptions for certain test methods.

General information

• Status: Active (reinstated)
• Publication date: June 1, 2019
• Publisher: ASTM International
• ICS / categories: 93.020 — Earthworks, excavations, foundation construction, underground works; developed by ASTM Committee D18 (subcommittee D18.12)
• Edition / version: ASTM D4543-19 (2019 edition)
• Number of pages: 13

Scope

This practice specifies procedures for preparing cylindrical rock test specimens from drill core or block samples for use in strength and deformation tests. It applies to preparation and dimensional verification of cylindrical specimens only (cubical, rectangular and other shapes are excluded). The practice gives procedures for checking diameter, length, straightness of the cylindrical surface, flatness and parallelism of end bearing surfaces, and the perpendicularity of end surfaces relative to the specimen axis. It also discusses curatorial handling and documentation and notes circumstances where tolerances may not be obtainable for certain lithologies or specimen conditions.

Key topics and requirements

• Procedures for trimming and machining rock core to cylindrical form suitable for mechanical testing.
• Dimensional requirements: nominal diameters, permitted diameter variation and tolerances for length-to-diameter (L/D) ratios.
• Geometric tolerances: straightness of the cylindrical surface, flatness and parallelism of end faces, and perpendicularity to the specimen axis.
• Inspection and measurement methods for verifying conformance (measuring devices, gages and acceptance checks).
• Curatorial and specimen-handling guidance, including moisture-condition considerations and documentation of specimen history.
• Notes on applicability and exceptions (e.g., some test methods referenced may relax certain machining/tolerance requirements).

Typical use and users

Used by geotechnical and rock mechanics laboratories, mining and petroleum/geothermal engineering groups, university researchers, materials testing labs, and consultants preparing intact rock specimens for compressive strength, tensile, triaxial, and deformation testing. Typical users are laboratory technicians, specimen preparers, quality managers, and engineers who require consistent specimen geometry to ensure comparability and validity of mechanical test results.

Related standards

Commonly referenced and complementary documents include other ASTM practices and test methods covering specimen handling and specific rock tests (examples include Practices for curatorial handling and core storage, specific test methods that require dimensional checks, and general specimen-preparation standards such as ASTM Practice D5079 and relevant test methods cited in D4543). Laboratories will often use D4543 together with the test standards for uniaxial compressive strength, triaxial tests, and other rock-property tests that reference specimen geometry tolerances.

Keywords

rock core, specimen preparation, cylindrical specimen, dimensional tolerances, flatness, parallelism, perpendicularity, length-to-diameter ratio, straightness, rock mechanics, geotechnical testing, ASTM D4543-19

FAQ

Q: What is this standard?

A: ASTM D4543-19 is a practice that provides recommended procedures for preparing cylindrical rock core specimens and verifying that they meet specified dimensional and shape tolerances required for mechanical testing.

Q: What does it cover?

A: It covers trimming and machining methods, measurement and inspection procedures, and tolerance checks for diameter, L/D ratio, straightness, end flatness and parallelism, and end perpendicularity for cylindrical rock test specimens. It excludes non-cylindrical specimen shapes.

Q: Who typically uses it?

A: Geotechnical and rock mechanics laboratories, mining and petroleum engineers, university researchers, testing service providers, and laboratory technicians preparing rock specimens for strength and deformation testing.

Q: Is it current or superseded?

A: The 2019 edition (ASTM D4543-19) is the current/reinstated edition (published June 1, 2019). Users should check with their organization or standards provider for any amendments or later revisions before relying on it for compliance.

Q: Is it part of a series?

A: D4543 is part of ASTM’s suite of rock and geotechnical test practices and is frequently used in conjunction with other ASTM rock mechanics test methods and specimen-handling practices; it was developed under Committee D18 (rock and rock mechanics) and cross-references related procedures and test methods.

Q: What are the key keywords?

A: Rock core, specimen preparation, cylindrical test specimen, dimensional tolerances, flatness, perpendicularity, L/D ratio, rock mechanics, geotechnical testing.