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13.020.060 Special Weather Conditions.
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| A. |
Cold Weather: The contractor shall comply fully with the provisions of ACI 306.1-90 as modified below: |
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1. |
Average daily temperatures as defined in ACI 306.1-90 will be determined and recorded by the City Engineer. |
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2. |
Concrete temperatures will be determined through the use of high-low thermometers placed and operated by the City below insulated blankets, or where the concrete is uncovered, by checking air temperatures. Uncovered concrete which has been subjected to freezing temperatures of any duration during the first 24 hours will be considered "frozen," and shall be rejected. |
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3. |
The months of December, January and February will be considered "Cold Weather" and will require concrete protection, regardless of temperature. |
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4. |
Concrete shall reach 75% of its design strength prior to backfilling. This strength can be determined through the use of field cured cylinders, made and tested at contractor's expense. Concrete must have 5 days where the average daily temperature is above 50 degrees F prior to backfilling unless field cured cylinders are taken. These days do not need to be consecutive. |
| B. |
Concrete operations in hot weather shall conform to Section 402.07 (a) of the Standard Specifications. |
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(History: Ord. STR-2295 §6, 2001; STR-2189 §1, 2000; CSW-498 §3(D-1) 69)B. |
