Work Item
ASTM WK75728

New Practice for Determination of Impact Durability of Rock for Erosion Control by the Drop Test Procedure

1. Scope

1.1 This practice presents a procedure that can be used to evaluate the impact durability and integrity (Note 1) of very large erosion control stone in a quarry or redistribution yard. This procedure is intended to be used for R150 class size (D6092) or larger. The procedure involves lifting individual pieces of rock to a specified height; dropping it upon a substrate; and observing any induced new fractures, separations at planes of weakness or changes to existing fractures, and other geological features of interest,. This procedure may be requested as a screening test for erosion stone before being transported to a project site. This practice is appropriate for the assessment of breakwater stone, armor stone, and riprap-sized rock materials. NOTE 1--Durability and integrity of individual rock pieces may be influenced by the presence of certain geological features and flaws. Examples of these features and flaws include stylolites, chert and shale seams, weak mineral fabric, blast-induced fractures, and other features that exist in natural rock. 1.2 UnitsThe values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are conversions to SI units that are provided for information only and are not considered standard. 1.3 All observed and measured values shall conform to the guidelines for significant digits and rounding established in Practice D6026, unless superseded by this standard. 1.4 This practice offers a set of instructions for performing one or more specific operations. This practice cannot replace education or experience and should be used in conjunction with professional judgment. Not all aspects of this practice may be applicable in all circumstances. This ASTM International standard is not intended to represent or replace the standard of care by which the adequacy of a given professional service must be judged, nor should this document be applied without consideration of a projects many unique aspects. The word Standard in the title of this document means only that the document has been approved through the ASTM consensus process. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of international Standards, Guides, and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


rip rap; armor stone; jetty stone; durability; drop test; attrition


Several specifications exist that describe a drop test for erosion stone. Such tests are performed on individual pieces of stone prior to transit from a quarry to a project site. Many of these specifications lack detail as to the substrate upon which the stone is dropped upon, the drop distances vary, methods of marking subject features are vague or not indicated, This will be an attempt to develop a more standardized protocol that can be used industry wide.

The title and scope are in draft form and are under development within this ASTM Committee.


Developed by Subcommittee: D18.17

Committee: D18

Staff Manager: Katerina Koperna

Work Item Status

Date Initiated: 02-03-2021

Technical Contact: James Fletcher

Item: 001

Ballot: D18.17 (21-03)

Status: Will Reballot Item

Item: 001

Ballot: D18.17 (21-05)

Status: Will Reballot Item