Laserfiche WebLink
2. Examine design reports and when satisfied that mix proportions will produce specified strength and <br /> requirements, sign reports and submit to Architect for approval at least 14 days prior to the proposed starting <br /> date for placing concrete. <br /> 3. Air-entraining admixtures, pozzolanic materials and proprietary chemical admixtures to be approved and in <br /> accordance with recommendation of the manufacturer. <br /> 4. Use accelerator, if approved, in proportions recommended by the manufacturer when the temperature of <br /> concrete as placed is less than 40F. <br /> 5. Water-reducing and set-controlling admixtures may be used in proportions recommended by the manufacturer <br /> when temperature of the concrete as placed exceeds 65F. <br /> 6. Select proportion of ingredients to produce proper placability, durability, strength and other required <br /> properties. <br /> 7. Design mix shall conform to procedures set forth in ACI 318 and 301 and in PCA's "Design and Control of <br /> Concrete Mixtures",twelfth edition. <br /> B. Aggregate <br /> 1. Test proposed aggregate according to ASTM C33 and C136. <br /> 2. Submit test reports for approval. <br /> 3. Utilize test data in proportion of design mixes. <br /> PART 3: EXECUTION <br /> 3.01 WEATHER PROTECTION <br /> A. Cold Weather: <br /> 1. Concrete placed during cold weather shall conform to the requirements of ACI 306.1. <br /> 2. Cold weather is defined as 3 or more successive days when the average daily outdoor temperature is less than <br /> 40°F. <br /> 3. Do not place concrete on frozen sub-grades. <br /> 4. Record concrete temperatures at least 3 times in each 24-hour period. <br /> 5. Maintain protection and leave forms in place for the entire curing period and as follows: <br /> a. Maintain protection for columns,walls, and supported slabs until at least 4 field cylinders,prepared and <br /> cured in accordance with ASTM C31, reach 85 percent of the specified 28-day strength, or laboratory <br /> cured cylinders reach the specified 28-day strength. <br /> 6. Submit detailed procedures for cold weather concreting. Review shall be for information only. <br /> 7. Follow recommended practices of ACI 306R. <br /> 03300-6 No.99132-CP2 <br />