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2105.2.2 Determination of Compressive Strength
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For SI: 1 inch = 25.4 mm, 1 pound per square inch = 0.00689 MPa.
The determination of compressive strength by the unit strength method shall be in accordance with Section 2105.2.2.1.1 for clay masonry, Section 2105.2.2.1.2 for concrete masonry and Section 2105.2.2.1.3 for AAC masonry.
The compressive strength of masonry shall be determined based on the strength of the units and the type of mortar specified using Table 2105.2.2.1.1, provided:
- Units are sampled and tested to verify compliance with ASTM C 62, ASTM C 216 or ASTM C 652.
- Thickness of bed joints does not exceed 5/8 inch (15.9 mm).
- For grouted masonry, the grout meets one of the following requirements:
| NET AREA COMPRESSIVE STRENGTH OF CLAY MASONRY UNITS (psi) | NET AREA COMPRESSIVE STRENGTH OF MASONRY (psi) | |
| Type M or S mortar | Type N mortar | |
| 1,700 | 2,100 | 1,000 |
| 3,350 | 4,150 | 1,500 |
| 4,950 | 6,200 | 2,000 |
| 6,600 | 8,250 | 2,500 |
| 8,250 | 10,300 | 3,000 |
| 9,900 | — | 3,500 |
| 11,500 | — | 4,000 |
For SI: 1 pound per square inch = 0.00689 MPa.
The compressive strength of masonry shall be determined based on the strength of the unit and type of mortar specified using Table 2105.2.2.1.2, provided:
- Units are sampled and tested to verify compliance with ASTM C 55 or ASTM C 90.
- Thickness of bed joints does not exceed 5/8 inch (15.9 mm).
- For grouted masonry, the grout meets one of the following requirements:
| NET AREA COMPRESSIVE STRENGTH OF CONCRETE MASONRY UNITS (psi) | NET AREA COMPRESSIVE STRENGTH OF MASONRY (psi)a | |
| Type M or S mortar | Type N mortar | |
| 1,250 | 1,300 | 1,000 |
| 1,900 | 2,150 | 1,500 |
| 2,800 | 3,050 | 2,000 |
| 3,750 | 4,050 | 2,500 |
| 4,800 | 5,250 | 3,000 |
- For units less than 4 inches in height, 85 percent of the values listed.
The compressive strength of AAC masonry shall be based on the strength of the AAC masonry unit only and the following shall be met:
- Units conform to ASTM C 1386.
- Thickness of bed joints does not exceed 1/8 inch (3.2 mm).
- For grouted masonry, the grout meets one of the following requirements:
The determination of compressive strength by the prism test method shall be in accordance with Sections 2105.2.2.2.1 and 2105.2.2.2.2.
The compressive strength of clay and concrete masonry shall be determined by the prism test method:
- Where specified in the construction documents.
- Where masonry does not meet the requirements for application of the unit strength method in Section 2105.2.2.1.
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