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Section 1905 Concrete Quality, Mixing and Placing

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1905.1 General
The required strength and durability of concrete shall be determined by compliance with the proportioning, testing, mixing and placing provisions of Sections 1905.1.1 through 1905.13.
1905.1.1 Strength
Concrete shall be proportioned to provide an average compressive strength as prescribed in Section 1905.3 and shall satisfy the durability criteria of Section 1904. Concrete shall be produced to minimize the frequency of strengths below f 'c as prescribed in Section 1905.6.3. For concrete designed and constructed in accordance with this chapter, f 'c shall not be less than 2,500 psi (17.22 MPa). No maximum specified compressive strength shall apply unless restricted by a specific provision of this code or ACI 318.
1905.2 Selection of Concrete Proportions
Concrete proportions shall be determined in accordance with the provisions of ACI 318, Section 5.2.
1905.3 Proportioning on the Basis of Field Experience and/or Trial Mixtures
Concrete proportioning determined on the basis of field experience and/or trial mixtures shall be done in accordance with ACI 318, Section 5.3.
1905.4 Proportioning Without Field Experience or Trial Mixtures
Concrete proportioning determined without field experience or trial mixtures shall be done in accordance with ACI 318, Section 5.4.
1905.5 Average Strength Reduction
As data become available during construction, it is permissible to reduce the amount by which the average compressive strength (f 'c) is required to exceed the specified value of f 'c in accordance with ACI 318, Section 5.5.
1905.6 Evaluation and Acceptance of Concrete
The criteria for evaluation and acceptance of concrete shall be as specified in Sections 1905.6.2 through 1905.6.5.
1905.6.1 Qualified Technicians
Concrete shall be tested in accordance with the requirements in Sections 1905.6.2 through 1905.6.5. Qualified field testing technicians shall perform tests on fresh concrete at the job site, prepare specimens required for curing under field conditions, prepare specimens required for testing in the laboratory and record the temperature of the fresh concrete when preparing specimens for strength tests. Qualified laboratory technicians shall perform all required laboratory tests.
1905.6.2 Frequency of Testing
The frequency of conducting strength tests of concrete and the minimum number of tests shall be as specified in ACI 318, Section 5.6.2.
Exception: When the total volume of a given class of concrete is less than 50 cubic yards (38 m3), strength tests are not required when evidence of satisfactory strength is submitted to and approved by the building official.
1905.6.3 Strength Test Specimens
Specimens prepared for acceptance testing of concrete in accordance with Section 1905.6.2 and strength test acceptance criteria shall comply with the provisions of ACI 318, Section 5.6.3.
1905.6.4 Field-Cured Specimens
Where required by the building official to determine adequacy of curing and protection of concrete in the structure, specimens shall be prepared, cured, tested and test results evaluated for acceptance in accordance with ACI 318, Section 5.6.4.
1905.6.5 Low-Strength Test Results
Where any strength test (see ACI 318, Section 5.6.2.4) falls below the specified value of f 'c, the provisions of ACI 318, Section 5.6.5, shall apply.
1905.7 Preparation of Equipment and Place of Deposit
Prior to concrete being placed, the space to receive the concrete and the equipment used to deposit it shall comply with ACI 318, Section 5.7.
1905.8 Mixing
Mixing of concrete shall be performed in accordance with ACI 318, Section 5.8.
1905.9 Conveying
The method and equipment for conveying concrete to the place of deposit shall comply with ACI 318, Section 5.9.
1905.10 Depositing
The depositing of concrete shall comply with the provisions of ACI 318, Section 5.10.
1905.11 Curing
The length of time, temperature and moisture conditions for curing of concrete shall be in accordance with ACI 318, Section 5.11.
1905.12 Cold Weather Requirements
Concrete to be placed during freezing or near-freezing weather shall comply with the requirements of ACI 318, Section 5.12.
1905.13 Hot Weather Requirements
Concrete to be placed during hot weather shall comply with the requirements of ACI 318, Section 5.13.

Related Code Sections

Section 1905 Concrete, Concrete Quality, Mixing and Placing
The required strength and durability of concrete shall be determined by compliance with the proportioning, testing, mixing and placing provisions ...
1905.12 Concrete, Cold Weather Requirements
Concrete to be placed during freezing or near-freezing weather shall comply with the requirements of ACI 318, Section 5.12 ...
1905.13 Concrete, Hot Weather Requirements
Concrete to be placed during hot weather shall comply with the requirements of ACI 318, Section 5.13 ...