International Building Code Section 1905


International Building Code 1905.10

Depositing. The depositing of concrete shall comply
with the provisions of ACI 318, Section 5.10.

International Building Code 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.

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.

International Building Code 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.

International Building Code 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.

International Building Code 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.

International Building Code 1905.13

Hot weather requirements. Concrete to be placed
during hot weather shall comply with the requirements of ACI
318, Section 5.13.

International Building Code 1905.2

Selection of concrete proportions. Concrete proportions
shall be determined in accordance with the provisions of
ACI 318, Section 5.2.

International Building Code 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.

International Building Code 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.

International Building Code 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.

International Building Code 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.

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.

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 (38m3), strength tests
are not required when evidence of satisfactory strength is
submitted to and approved by the building official.

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.

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.

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.

International Building Code 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.

International Building Code 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 (38m3), strength tests
are not required when evidence of satisfactory strength is
submitted to and approved by the building official.

International Building Code 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.

International Building Code 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.

International Building Code 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.

International Building Code 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.

International Building Code 1905.8

Mixing. Mixing of concrete shall be performed in
accordance with ACI 318, Section 5.8.

International Building Code 1905.9

Conveying. The method and equipment for conveying
concrete to the place of deposit shall comply with ACI 318,
Section 5.9.