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// CODE SNIPPET

2105.2.2 Determination of Compressive Strength

2014 FBC - Building, 5th edition > 21 Masonry > 2105 Quality Assurance > 2105.2 Acceptance Relative to Strength Requirements > 2105.2.2 Determination of Compressive Strength
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The compressive strength for each wythe shall be determined by the unit strength method or by the prism test method as specified herein.

2105.2.2.1 Unit Strength Method

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.

2105.2.2.1.1 Clay 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:

  1. Units are sampled and tested to verify compliance with ASTM C 62, ASTM C 216 or ASTM C 652.
  2. Thickness of bed joints does not exceed 5/8 inch (15.9 mm).
  3. For grouted masonry, the grout meets one of the following requirements:
    1. Grout conforms to Article 2.2 of TMS 602/ACI 530.1/ASCE 6.
    2. Minimum grout compressive strength equals or exceeds f'm but not less than 2,000 psi (13.79 MPa). The compressive strength of grout shall be determined in accordance with ASTM C 1019.
TABLE 2105.2.2.1.1
COMPRESSIVE STRENGTH OF CLAY MASONRY
NET AREA COMPRESSIVE STRENGTH
OF CLAY MASONRY UNITS (psi)
NET AREA COMPRESSIVE
STRENGTH OF MASONRY (psi)
Type M or S mortarType N mortar
1,7002,1001,000
3,3504,1501,500
4,9506,2002,000
6,6008,2502,500
8,25010,3003,000
9,900—3,500
11,500—4,000
For SI: 1 pound per square inch = 0.00689 MPa.

2105.2.2.1.2 Concrete Masonry

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:

  1. Units are sampled and tested to verify compliance with ASTM C 55 or ASTM C 90.
  2. Thickness of bed joints does not exceed 5/8 inch (15.9 mm).
  3. For grouted masonry, the grout meets one of the following requirements:
    1. Grout conforms to Article 2.2 of TMS 602/ACI 530.1/ASCE 6.
    2. Minimum grout compressive strength equals or exceeds f'm but not less than 2,000 psi (13.79 MPa). The compressive strength of grout shall be determined in accordance with ASTM C 1019.
TABLE 2105.2.2.1.2
COMPRESSIVE STRENGTH OF CONCRETE MASONRY
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
1,2501,3001,000
1,9002,1501,500
2,8003,0502,000
3,7504,0502,500
4,8005,2503,000
For SI: 1 inch = 25.4 mm, 1 pound per square inch = 0.00689 MPa.
  1. For units less than 4 inches in height, 85 percent of the values listed.

2105.2.2.1.3 AAC Masonry

The compressive strength of AAC masonry shall be based on the strength of the AAC masonry unit only and the following shall be met:

  1. Units conform to ASTM C 1386.
  2. Thickness of bed joints does not exceed 1/8 inch (3.2 mm).
  3. For grouted masonry, the grout meets one of the following requirements:
    1. Grout conforms to Article 2.2 of TMS 602/ACI 530.1/ASCE 6.
    2. Minimum grout compressive strength equals or exceeds f'AAC but not less than 2,000 psi (13.79 MPa). The compressive strength of grout shall be determined in accordance with ASTM C 1019.

2105.2.2.2 Prism Test Method

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.

2105.2.2.2.1 General

The compressive strength of clay and concrete masonry shall be determined by the prism test method:

  1. Where specified in the construction documents.
  2. Where masonry does not meet the requirements for application of the unit strength method in Section 2105.2.2.1.

2105.2.2.2.2 Number of Prisms Per Test

A prism test shall consist of three prisms constructed and tested in accordance with ASTM C 1314.

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)
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