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not before reaching the following number of day- degrees (whichever is <br />the longer): <br />Forms for <br />1 Beams and slabs <br />Walls and vertical surfaces (non - <br />water retaining) <br />1 Walls and vertical surfaces (water <br />retaining) <br />*Day- degree: Total number of days times average daily air <br />temperature at surface of concrete. For example, 5 days at a daily <br />weighted average temperature of 60 degrees F equal 300 <br />day- degrees. Temperatures below 50 degrees F not to be included. <br />f' <br />L <br />L' <br />lJ <br />Day - Degree* <br />500 <br />100 <br />150 <br />B. Shores shall not be removed until the concrete has attained at least <br />60% of the specified strength and also sufficient strength to support <br />safely its own weight and the construction live loads upon it, but <br />concrete shall be minimum age of 14 days before such removal. <br />3.10 FAILURE TO MEET REQUIREMENTS <br />A. Should the strengths shown by the test specimens made and tested in <br />accordance with the above provision fall below the values given in <br />Table A, the Engineer shall have the right to require changes in <br />proportions as outlined above to apply to the remainder of the work. <br />Furthermore, the Engineer shall have the right to require additional <br />curing on those portions of the structure represented by the test <br />specimens which failed, the cost of such additional curing to be at the <br />Contractor's expense. In the event that such additional curing does <br />not give the strength required, as evidenced by core and /or load tests, <br />the Engineer shall have the right to require strengthening or <br />replacement of those portions of the structure which fail to develop <br />the required strength. The cost of all such core borings and /or load <br />tests and any strengthening or concrete replacement required because <br />strengths of test specimens are below that specified, shall be entirely <br />at the expense of the Contractor. In such cases of failure to meet <br />strength requirements the Contractor and Engineer shall confer to <br />determine the adjustment, if any, can be made in conformity with <br />Sections 16 and 17 of ASTM Specification C94 for Ready -Mixed <br />Concrete. <br />B. When the tests on control specimens of concrete fall below the <br />required strength, the Engineer will permit check tests for structure in <br />accordance with ASTM Methods C42 and C39. In case of failure of <br />the latter, the Engineer, in addition to other recourses, may require, at <br />07/03 03300 -14 03- 3148.A <br />