// CODE SNIPPET
2105.2.2 Determination of Compressive Strength
JUMP TO FULL CODE CHAPTER
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.
Related Code Sections
2105.2.2 Masonry, Determination of Compressive Strength
The compressive strength for each wythe shall be determined by the unit strength method or by the prism test method as specified herein ...
2014 FBC - Building, 5th edition > 21 Masonry > 2105 Quality Assurance > 2105.2 Acceptance Relative to Strength Requirements > 2105.2.2 Determination of Compressive Strength
2105.2.2.2.1 Masonry, General
The compressive strength of clay and concrete masonry shall be determined by the prism test method: Where specified in the construction documents ...
2014 FBC - Building, 5th edition > 21 Masonry > 2105 Quality Assurance > 2105.2 Acceptance Relative to Strength Requirements > 2105.2.2 Determination of Compressive Strength > 2105.2.2.2 Prism Test Method > 2105.2.2.2.1 General
2105.2.2.2.2 Masonry, Number of Prisms Per Test
A prism test shall consist of three prisms constructed and tested in accordance with ASTM C 1314 ...
2014 FBC - Building, 5th edition > 21 Masonry > 2105 Quality Assurance > 2105.2 Acceptance Relative to Strength Requirements > 2105.2.2 Determination of Compressive Strength > 2105.2.2.2 Prism Test Method > 2105.2.2.2.2 Number of Prisms Per Test
1803.5.9 Soils and Foundations, Controlled Low-Strength Material (CLSM)
test method(s) to be used to determine the compressive strength or bearing capacity of the CLSM. Test methods for determining the acceptance ...
2017 FBC - Building, 6th edition > 18 Soils and Foundations > 1803 Geotechnical Investigations > 1803.5 Investigated Conditions > 1803.5.9 Controlled Low-Strength Material (CLSM)
1803.5.9 Soils and Foundations, Controlled Low-Strength Material (CLSM)
or field test method(s) to be used to determine the compressive strength or bearing capacity of the CLSM. Test methods for determining the acceptance ...
2014 FBC - Building, 5th edition > 18 Soils and Foundations > 1803 Geotechnical Investigations > 1803.5 Investigated Conditions > 1803.5.9 Controlled Low-Strength Material (CLSM)