ASTM C1531-02

Standard Test Methods for In Situ Measurement Of Masonry Mortar Joint Shear Strength Index

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 C 1197. Horizontal displacement of the test unit is monitored throughout the test. The test setup for Method A is shown in .
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 .
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 . Horizontal displacement of the test unit is generally not measured during this procedure.
1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 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.

General Information

• Status: Historical
• Publication Date: 09-Jun-2002
• ICS: 91.080.30 - Masonry
• Technical Committee: C15 - Manufactured Masonry Units
• Drafting Committee: C15.04 - Research

Relations

• Replaced By: ASTM C1531-03 - Standard Test Methods for In Situ Measurement Of Masonry Mortar Joint Shear Strength Index
• Effective Date: 10-Jan-2003

Standards Content (Sample)

Designation: C 1531 – 02
Standard Test Methods for
In Situ Measurement Of Masonry Mortar Joint Shear
1
Strength Index
This standard is issued under the fixed designation C 1531; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope C 1196 Test Method for In Situ Compressive Stress Within
Solid Unit Masonry Estimated Using Flatjack Measure-
1.1 These test methods cover procedures for the determina-
2
ments
tion of the average in situ mortar joint shear strength index in
C 1197 Test Method for In Situ Measurement of Masonry
existing unreinforced solid-unit and ungrouted hollow-unit
2
Deformability Properties Using the Flatjack Method
masonry built with clay or concrete units. Three methods are
C 1209 Terminology of Concrete Masonry Units and Re-
provided:
2
lated Units
1.1.1 Method A (with Flatjacks Controlling Normal Com-
2
C 1232 Terminology of Masonry
pressive Stress)—For determining mortar joint shear strength
3
E 4 Practices for Force Verification of Testing Machines
index when the state of normal compressive stress at the test
2.2 Other Document:
site is controlled during the test using the flatjack method
Uniform Code for Building Conservation (Appendix Chap-
described in Test Method C 1197. Horizontal displacement of
ter 1, Earthquake Hazard Reduction in Existing Unrein-
the test unit is monitored throughout the test. The test setup for
forced Masonry Buildings), International Conference of
Method A is shown in Fig. 1.
Building Officials, Whittier, CA, 1997
1.1.2 Method B (without Flatjacks Controlling Normal
Compressive Stress)—For determining mortar joint shear
3. Terminology
strength index when using an estimate of the normal compres-
3.1 Terminology defined in Terminologies C 43, C 1180,
sive stress at the location of the test site. Horizontal displace-
C 1209, and C 1232 shall apply for these test methods.
ment of the test unit is not monitored during this procedure.
The test set up for Method B is shown in Fig. 2.
4. Summary of Test Method
1.1.3 Method C (with Flatjack Applying Horizontal Load)—
4.1 The in-place shear test is used to provide an index of the
For determining mortar joint shear strength index using an
in situ, horizontal shear resistance of mortar joints in unrein-
estimate of the normal compressive stress at the location of the
forced masonry. For Method A, a single masonry unit is
test site, as shown in Fig. 3. Horizontal displacement of the test
removed from opposite ends of the chosen test unit as shown
unit is generally not measured during this procedure.
in Fig. 1. For Method B, a single masonry unit and a head joint
1.2 The values stated in inch-pound units are to be regarded
are removed from opposite ends of the chosen test unit, as
as the standard. The values given in parentheses are for
shown in Fig. 2. For Method C, head joints on both ends of the
information only.
tested unit are removed as shown in Fig. 3. Ensure that the bed
1.3 This standard does not purport to address all of the
joints are not disturbed in the unit to be tested. The test unit is
safety concerns, if any, associated with its use. It is the
then displaced horizontally relative to the surrounding masonry
responsibility of the user of this standard to establish appro-
using a hydraulic jack or specialized flatjacks. The horizontal
priate safety and health practices and determine the applica-
force required to cause first movement of the test unit provides
bility of regulatory limitations prior to use.
a measured index of the mortar joint shear strength.
2. Referenced Documents
5. Significance and Use
2.1 ASTM Standards:
2 5.1 The masonry mortar joint shear strength index obtained
C 43 Terminology of Structural Clay Products
by this test method is related to the masonry wall shear strength
C 1180 Terminology of Mortar and Grout for Unit Ma-
2 by a relationship contained within Appendix Chapter 1 of the
sonry
Uniform Code for Building Conservation. The user of this
standard is cautioned that the shear strength relationship
1
These test methods are under the jurisdiction of ASTM Committee C15 on
contained within the Uniform Code for Building Conservation
Manufactured Masonry Units and are the direct responsibility of Subcommittee
C15.04 on Research.
Current edition approved June 10, 2002. Published September 2002.
2 3
Annual Book of ASTM Standards, Vol 04.05 Annual Book of ASTM Standards, Vol 03.01.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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C1531–02
FIG. 1 Test Setup—Method A
FIG. 3 Test Setup—Method C
FIG. 2 Test Setup—Method B
is an empirical relationship based on tests of early 20th-century
At the completion of the Method A
...