1904.4.2 Deicing chemicals.
BC § 1904.4.2
For concrete exposed to freezing and thawing in the presence of moisture and deicing chemicals, the maximum weight of fly ash, other pozzolans, silica fume or slag that is included in the concrete shall not exceed the percentages of the total weight of cementitious materials permitted by Table 1904.4.2. Table 1904.4.2Requirements for Concrete Exposed to Deicing Chemicals Cementitious Materials Maximum Percent of Total Cementitious Materials by Weight a, bFly ash or other pozzolans conforming to ASTM C 61825 dSlag conforming to ASTM C 98950Silica fume conforming to ASTM C 124010Total of fly ash or other pozzolans, slag and silica fume50 cTotal of fly ash or other pozzolans and silica fume35 c a. The total cementitious material also includes ASTM C 150, ASTM C 595, ASTM C845 and ASTM C 1157 cement. b. The maximum percentages shall include: 1. Fly ash or other pozzolans present in Type IP or I(PM) blended cement, ASTM C 595, or ASTM C 1157.
2.Slag used in the manufacture of an IS or I (SM) blended cement, ASTM C 595, or ASTM C 1157.
3.Silica fume, ASTM C 1240, present in a blended cement. c. Fly ash or other pozzolans and silica fume shall constitute no more than 25 and 10 percent, respectively, of the total weight of the cementitious materials. The amount of fly ash or other pozzolans conforming to ASTM C 618 shall be permitted to be increased in accordance with footnote d, provided the maximum percentage of supplemental cementitious materials does not exceed the maximum values stated in Table 1904.4.2 when combining multiple types of supplemental cementitious materials. d. Amount of fly ash or other pozzolans conforming to ASTM C 618 in a given concrete mixture can be increased to 35% provided that the concrete is not placed during cold weather as defined by ACI 306 or that the concrete is membrane cured and protected from freezing until the concrete has attained 3,500 psi.
