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ASTM C1531-22
Standard Test Methods for In Situ Measurement of Masonry Mortar Joint Shear Strength Index
NORMA vydaná dňa 1.12.2022
Informácie o norme:
Označenie normy: ASTM C1531-22
Dátum vydania normy: 1.12.2022
Kód tovaru: NS-1097739
Počet strán: 8
Približná hmotnosť: 24 g (0.05 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Kategórie - podobné normy:
Anotácia textu normy ASTM C1531-22 :
Keywords:
coefficient of friction, flatjack, in situ, masonry, mortar joint, nondestructive evaluation, shear strength,, ICS Number Code 91.080.30 (Masonry)
Doplňujúce informácie
| Significance and Use | ||||||||||||||
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5.1?This test method provides a means of evaluating the horizontal in-plane shear behavior of mortar joints in existing unreinforced masonry assemblies (see Note 2). Note 2:?The masonry mortar joint shear strength index obtained
by this test method can be related to the masonry wall shear
strength by relationships contained in referencing Codes and
Standards. For example, formulas relating shear index to wall shear
strength are found in Chapter A1 of the International Existing
Building Code and Chapter 11 of the Seismic Evaluation and Retrofit
of Existing Buildings, ASCE Standard ASCE/SEI 41. The user of this
standard is cautioned that these shear strength relationships are
typically empirical relationships based on tests of early
20th-century unreinforced brick masonry. These relationships
typically assume that wall shear strength is limited by shear of
the mortar joints rather than shear through the units
5.2?For hollow ungrouted or solid unit masonry construction the shear strength index is measured only for the mortar bed joints vertically adjacent to the unit being tested. When testing hollow ungrouted masonry construction, the shear strength index is based on the horizontal interface between the mortar and the test unit and the masonry above and below the test unit. In the case of multi-wythe construction, the measured mortar joint shear strength index is applicable only to the wythe in which the test unit is located; no headers shall exist immediately above or below the test unit. The contribution of any existing collar joint mortar to the measured shear strength index is neglected, and this may lead to an overestimate of the shear strength index (see Note 3). Note 3:?Some documents that reference this test method,
including ASCE/SEI 41, include a reduction factor to account for
the contribution of a filled collar joint to the measured shear
strength index.
5.3?The test procedure listed for Method A may be conducted as an extension of Test Method C1197. The two-flatjack test, conducted in accordance with Test Method C1197, provides half of the required test setup for Method A. At the completion of both the C1197 and the C1531 Method A test, one would know the deformability of the masonry at the test and the relationship between the expected joint shear strength index and the normal compressive stress. |
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| 1. Scope | ||||||||||||||
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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. FIG. 1?Test SetupMethod A Note 1:?A paper1.1.2?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.
FIG. 2?Test SetupMethod B 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. FIG. 3?Test SetupMethod C 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. |
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| 2. Referenced Documents | ||||||||||||||
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