ASTM C1531-22
Standard Test Methods for In Situ Measurement of Masonry Mortar Joint Shear Strength Index

Standard No.

ASTM C1531-22

Release Date

2022

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM C1531-22

Scope

1.1 These test methods cover procedures for the determination of the average in situ mortar joint shear strength index in existing unreinforced solid-unit and ungrouted hollow-unit masonry built with clay or concrete units. Three methods are provided: 1.1.1 Method A (with Flatjacks Controlling Normal Compressive Stress)—For determining mortar joint shear strength index when the state of normal compressive stress at the test site is controlled during the test using the flatjack method described in Test Method C1197. Horizontal displacement of the test unit is monitored throughout the test. The test setup for Method A is shown in Fig. 1. NOTE 1—A paper2 by Francesco Graziotti et. al of Univ. of Pavia included in ASTM STP 1612 discusses alternative methods for interpreting Method A testing results. 1.1.2 Method B (without Flatjacks Controlling Normal Compressive Stress)—For determining mortar joint shear strength index when using an estimate of the normal compressive stress at the location of the test site. Horizontal displacement of the test unit is not monitored during this procedure. The test set up for Method B is shown in Fig. 2. 1.1.3 Method C (with Flatjack Applying Horizontal Load)— For determining mortar joint shear strength index using an estimate of the normal compressive stress at the location of the test site, as shown in Fig. 3. Horizontal displacement of the test unit is generally not measured during this procedure. 1.2 The text of this standard refers to notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard. 1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 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.

ASTM C1531-22 Referenced Document

• ASTM C1180 Standard Terminology of Mortar and Grout for Unit Masonry
• ASTM C1196 Standard Test Method for In Situ Compressive Stress Within Solid Unit Masonry Estimated Using Flatjack Measurements
• ASTM C1197 Standard Test Method for In Situ Measurement of Masonry Deformability Properties Using the Flatjack Method
• ASTM C1232 Standard Terminology for Masonry*， 2023-12-15 Update
• ASTM E4 Standard Practices for Force Verification of Testing Machines

ASTM C1531-22 history

• 2022 ASTM C1531-22 Standard Test Methods for In Situ Measurement of Masonry Mortar Joint Shear Strength Index
• 2016 ASTM C1531-16 Standard Test Methods for In Situ Measurement of Masonry Mortar Joint Shear Strength Index
• 2015 ASTM C1531-15 Standard Test Methods for In Situ Measurement of Masonry Mortar Joint Shear Strength Index
• 2009 ASTM C1531-09 Standard Test Methods for In Situ Measurement Of Masonry Mortar Joint Shear Strength Index
• 2003 ASTM C1531-03 Standard Test Methods for In Situ Measurement Of Masonry Mortar Joint Shear Strength Index
• 2002 ASTM C1531-02 Standard Test Methods for In Situ Measurement Of Masonry Mortar Joint Shear Strength Index