26.4 Concrete Materials and Mixture Requirements
(a) Cementitious materials shall conform to the specifications in Table 126.96.36.199.1(a).
|Portland cement||ASTM C150|
|Blended hydraulic cements||ASTM C595, excluding Type IS (≥70) and Type IT (S ≥ 70)|
|Expansive hydraulic cement||ASTM C845|
|Hydraulic cement||ASTM C1157|
|Fly ash and natural pozzolan||ASTM C618|
|Slag cement||ASTM C989|
|Silica fume||ASTM C1240|
(a) Aggregates shall conform to (1) or (2):
(1) Normalweight aggregate: ASTM C33.
(2) Lightweight aggregate: ASTM C330.
(b) Aggregates not conforming to ASTM C33 or ASTM C330 are permitted if they have been shown by test or actual service to produce concrete of adequate strength and durability and are approved by the building official.
(a) Mixing water shall conform to ASTM C1602.
(b) Mixing water, including that portion of mixing water contributed in the form of free moisture on aggregates, shall not contain deleterious amounts of chloride ion when used for prestressed concrete, for concrete that will contain aluminum embedments, or for concrete cast against stay-in-place galvanized steel forms.
(a) Admixtures shall conform to (1) through (4):
(1) Water reduction and setting time modification: ASTM C494.
(2) Producing flowing concrete: ASTM C1017.
(3) Air entrainment: ASTM C260.
(4) Inhibiting chloride-induced corrosion: ASTM C1582.
(c) Calcium chloride or admixtures containing chloride from sources other than impurities in admixture ingredients shall not be used in prestressed concrete, in concrete containing embedded aluminum, or in concrete cast against stay-in-place galvanized steel forms.
(a) Requirements (1) through (11) for each concrete mixture, based on assigned exposure classes or design of members:
(1) Minimum specified compressive strength of concrete, fc'.
(2) Test age for demonstrating compliance with fc' if different from 28 days.
(4) Nominal maximum size of coarse aggregate not to exceed the least of (i), (ii), and (iii):
(i) one-fifth the narrowest dimension between sides of forms
(ii) one-third the depth of slabs
(5) For members assigned to Exposure Category F, air content from 188.8.131.52.
(6) For members assigned to Exposure Class C, applicable chloride ion limits for assigned Exposure Class from 184.108.40.206.
(8) For members assigned to Exposure Class S2 or S3, admixtures containing calcium chloride are prohibited.
(10) Requirement for submittal of the volumetric fractions of aggregate in lightweight concrete mixtures for the verification of λ value if used in design.
(b) At the option of the licensed design professional, exposure classes based on the severity of the anticipated exposure of members.
(c) The required compressive strength at designated stages of construction for each part of the structure designed by the licensed design professional.
(a) The required compressive strength at designated stages of construction for each part of the structure not designed by the licensed design professional shall be submitted for review.
(b) The maximum percentage of pozzolans, including fly ash and silica fume, and slag cement in concrete assigned to Exposure Class F3, shall be in accordance with Table 220.127.116.11(b) and (1) and (2).
(1) The maximum percentage limits in Table 18.104.22.168(b) shall include the fly ash or other pozzolans, slag cement, and silica fume used in the manufacture of ASTM C595 and C1157 blended cements.
|Cementitious materials||Maximum percent of total cementitious materials by mass|
|Fly ash or other pozzolans conforming to ASTM C618||25|
|Slag cement conforming to ASTM C989||50|
|Silica fume conforming to ASTM C1240||10|
|Total of fly ash or other pozzolans and silica fume||35|
|Total of fly ash or other pozzolans, slag cement, and silica fume||50|
(c) For concrete exposed to sulfate, alternative combinations of cementitious materials to those specified in 22.214.171.124(a)(7) are permitted if tests for sulfate resistance satisfy the criteria in Table 126.96.36.199(c).
|Exposure class||Maximum expansion strain if tested using ASTM C1012|
|At 6 months||At 12 months||At 18 months|
|S1||0.10 percent||No requirement||No requirement|
|S2||0.05 percent||0.10 percent||No requirement|
|S3||No requirement||No requirement||0.10 percent|
The 12-month expansion limit applies only if the measured expansion exceeds the 6-month maximum expansion limit.
(d) Steel fiber-reinforced concrete used for shear resistance shall satisfy (1) and (2):
(1) Conform to ASTM C1116.
(2) Contain at least 100 lb of deformed steel fibers per cubic yard of concrete.
(1) Can be placed readily without segregation into forms and around reinforcement under anticipated placement conditions.
(3) Conforms to strength test requirements for standard-cured specimens.
(b) Concrete mixture proportions shall be established in accordance with Article 4.2.3 of ACI 301 or by an alternative method acceptable to the licensed design professional. Alternative methods shall have a probability of satisfying the strength requirements for acceptance tests of standard-cured specimens that meets or exceeds the probability associated with the method in Article 4.2.3 of ACI 301. If Article 4.2.3 of ACI 301 is used, the strength test records used for establishing and documenting concrete mixture proportions shall not be more than 24 months old.
(a) Documentation of concrete mixture characteristics shall be submitted for review by the licensed design professional before the mixture is used and before making changes to mixtures already in use. Evidence of the ability of the proposed mixture to comply with the concrete mixture requirements in the construction documents shall be included in the documentation. The evidence shall be based on field test records or laboratory trial batches. Field test records shall represent conditions similar to those anticipated during the proposed Work.
(b) If field or laboratory test data are not available, and fc' ≤ 5000 psi, concrete proportions shall be based on other experience or information, if approved by the licensed design professional. If fc' > 5000 psi, test data documenting the characteristics of the proposed mixtures are required.
(c) If data become available during construction that consistently exceed the strength-test acceptance criteria for standard-cured specimens, it shall be permitted to modify a mixture to reduce the average strength. Submit evidence acceptable to the licensed design professional to demonstrate that the modified mixture will comply with the concrete mixture requirements in the construction documents.