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<br />I <br />I <br />D <br />o <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />m <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />3.09 REMOVAL OF FORMS <br /> <br />A. Except as otherwise specifically authorized by the Engineer, forms shall <br />not be removed before the concrete has cured as specified above in <br />subparagraph 3.08C and the concrete has attained a strength of at least <br />30 percent of the ultimate strength prescribed by the design, and not <br />before reaching the following number of day-degrees (whichever is the <br />longer): <br /> <br />Forms for <br /> <br />Dav-Deqree* <br /> <br />Beams and slabs <br />Walls and vertical surfaces (non- <br />water retaining) <br />Walls and vertical surfaces (water <br />retaining) <br /> <br />500 <br /> <br />100 <br /> <br />150 <br /> <br />*Day-degree: Total number of days times average daily air temperature <br />at surface of concrete. For example, 5 days at a daily weighted average <br />temperature of 60 degrees F equal 300 day-degrees. Temperatures <br />below 50 degrees F not to be included. <br /> <br />B. Shores shall not be removed until the concrete has attained at least 60% <br />of the specified strength and also sufficient strength to support safely its <br />own weight and the construction live loads upon it, but concrete shall be <br />minimum age of 14 days before suoh removal. <br /> <br />3.10 FAILURE TO MEET REQUIREMENTS <br /> <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 Table <br />A, the Engineer shall have the right to require changes in proportions as <br />outlined above to apply to the remainder of the work. Furthermore, the <br />Engineer shall have the right to require additional curing on those portions <br />of the structure represented by the test specimens which failed, the cost <br />of such additional curing to be at the Contractor's expense. In the event <br />that such additional curing does not give the strength required, as <br />evidenced by core and/or load tests, the Engineer shall have the right to <br />require strengthening or replacement of those portions of the structure <br />which fail to develop the required strength. The cost of all such core <br />borings and/or load tests and any strengthening or concrete replacement <br />required because strengths of test specimens are below that specified, <br />shall be entirely at the expense of the Contractor. In such cases of failure <br />to meet strength requirements the Contractor and Engineer shall confer to <br />determine the adjustment, if any, can be made in conformity with Sections <br />16 and 17 of ASTM Specification C94 for Ready-Mixed Concrete. <br /> <br />04/08 <br /> <br />03300-14 <br /> <br />06-5723 <br />