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Masonry Mortar Joint Shear Strength Index Test.

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Evaluation of the shear resistance of mortar joints in brick, block, and stone masonry construction

Masonry Mortar Joint Shear Strength Index Test measures the shear resistance offered by the mortar joint between masonry units such as bricks, concrete blocks, AAC blocks, or stones. The test evaluates how strongly two masonry units resist slipping or shearing under applied load. It is conducted on prepared masonry wall. Shear strength is a critical indicator of Wall stability, Load transfer capability, Overall masonry performance. This test is widely required for structural masonry, load-bearing walls, earthquake-resistant construction.

Why MMJSSIMatters.

Determines the Actual Shear Strength of Masonry Joints

Shear strength governs the ability of a wall to resist: Lateral loads, Wind pressures, Seismic actions, and Foundation settlement effects. If mortar joints have poor shear capacity, masonry walls can crack, slip, or fail under stress.

Ensures Mortar Mixing, Workmanship & Bonding Quality

Weak shear strength often indicates: Incorrect mortar mix ratio, Excessive water in mortar, Poor wetting of brick/block, Inadequate curing, Improper joint filling. Use of low-quality mortar. Testing helps identify workmanship faults early, preventing large-scale structural issues.

Critical for Earthquake-Resistant & Load-Bearing Wall Design

Masonry shear failure is one of the most common modes during earthquakes. Accurate shear strength values help engineers: Improve ductility, Prevent diagonal cracking, ensure safe lateral load performance, design stronger connections and ties. This leads to safer structures, especially in seismic zones of India.

NDT TESTING

GL Advantages.

Accredited Facility: NABL-accredited laboratory with traceable calibration and stringent Quality System procedures.

Compliance with Standards: Tests conducted in accordance with relevant IS/ASTM/RILEM/EN standards.

Experienced Personnel: Technologists and experts who interpret results and recommend mitigation strategies.

Rapid and Reliable Reporting: Valid reports that comply with relevant standards.

Testing Capabilities: Lab and on-site testing, along with post-test consulting services.

Global Lab Advantage.

Accredited facility.
Standards compliance.
Experienced analysts.
Fast, reliable reporting.
Field + Lab capability.

Applications

The Masonry Mortar Joint Shear Strength Index Test is essential for: Residential & commercial masonry buildings, Load-bearing masonry walls, AAC, brick & block wall construction, Earthquake-resistant design verification, Retaining walls & boundary walls, Repair & strengthening design assessment, QA/QC for large-scale building projects

Any structure requiring masonry shear performance certification

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Masonry Mortar Joint Shear Strength Index Test

MMJSSI Test

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Global Lab provides comprehensive testing for construction and engineering materials, including concrete, cement, steel, aggregates, bitumen, soil, tiles, paver blocks, and other civil and infrastructure materials. We also handle customized tests as per client or project specifications.

Yes. Our team is equipped with mobile testing facilities and field instruments for on-site sampling, inspection, and testing — ensuring quick and reliable results without disrupting your project timelines.