Laserfiche WebLink
2. Use air-entraining admixture in exterior concrete exposed to weather.Add air-entraining admixture at <br /> manufacturer's prescribed rate to result in concrete at point of placement having total air content <br /> specified above. <br /> 3. Use admixtures for water reduction and set control(accelerators and retarders)in strict compliance with <br /> manufacturer's directions and with architect's approval. <br /> 4. Verify with the admixture manufacturer the following: <br /> a. The compatibility of the individual admixtures when combined in the concrete mix. <br /> b. The compatibility of the individual admixtures with the concrete materials. <br /> F. Supplementary Cementitous Materials(SCM): <br /> 1. Concrete mix shall contain SCM at the amounts specified unless other amounts are approved by SER. <br /> Either fly ash or ground granulated blast furnace slag(GGBFS)may be used for the SCM but shall not be <br /> used together to form a ternary mix.Use of fly ash or GGBFS in the concrete mix is mandatory. <br /> 2. Fly Ash:Substitute fly ash for Portland cement at 15%of the total cementitious content. <br /> a. If used to mitigate potential aggregate reactivity,only Type F fly ash may be used and shall have the <br /> following maximum properties:1.5%available alkali and 8.0%CaO.When a maximum of 30% <br /> replacement is used,up to 10.0%CaO is permitted. <br /> 3. Ground Granulated Blast Furnace Slag (GGBFS): Substitute GGBFS for Portland cement at a maximum of <br /> 15%of the total cementitious content. <br /> 4. Maintain air-entrainment at specified levels. <br /> 5. In cold weather,provide adequate concrete strength gain so concrete will not be damaged from traffic and <br /> loads of use. <br /> G. Calcium Chloride Admixture: <br /> 1. Calcium chloride(Type Q conforming to ASTM D98 may be used in solution form as part of the mixing <br /> water to accelerate concrete setting and early strength development. <br /> 2. Amount of calcium chloride added shall not be more than necessary to produce the desired results and <br /> shall not exceed 2%by weight of cement. <br /> 3. The dosage range for the calcium chloride for the entire project shall not vary by more than 1%. Range is <br /> defined as the difference between the maximum and minimum dosages of calcium chloride for the entire <br /> p roj ect. <br /> 4. Calcium chloride shall not be used in the following applications unless approved by SER: <br /> a. Concrete containing embedded dissimilar metals or aluminum <br /> b. Slabs supported on permanent galvanized steel forms. <br /> C. Concrete exposed to deicing chemicals <br /> d. Prestressed or post-tensioned concrete <br /> e. Concrete containing aggregates with potentially deleterious reactivity <br /> f. Concrete exposed to soil or water containing sulfates. <br /> 5. Use calcium chloride in accordance with manufacturer's recommendation. <br /> H. Chloride-ion Concentration:Maximum water-soluble chloride-ion concentrations in hardened concrete at ages <br /> from 28 to 42 days contributed from the ingredients including water,aggregates,cementitious materials,and <br /> admixtures shall not exceed the following limits unless approved by SER: <br /> 1. Type of Member Maximum water-soluble chloride ion (CI-)content in concrete(percent by weight of <br /> cement) <br /> 2. Prestressed concrete 0.06 <br /> 3. Reinforced concrete exposed to chloride in service 0.15 <br /> 5. Reinforced concrete that will be dry or protected from moisture in service 1.00 <br /> 7. Other reinforced concrete construction 0.30 <br /> I. When using calcium chloride or other admixtures containing chlorides,measure water-soluble chloride-ion <br /> content (percent by weight of cementitious materials) per ASTM C 1218. Sample shall be from concrete <br /> representing the submitted mix design and maximum chloride dosage anticipated for the project. <br /> 2-26-18 <br /> 033000-7 <br />