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A. Design, erect, support, brace, and maintain formwork to safely support vertical <br /> and lateral loads which will be applied until such loads can be supported safely <br /> by the concrete structure. <br /> B. Construct forms to the exact sizes, shapes, lines, and dimensions shown, and as <br /> required to obtain accurate alignment, location, grades, and level and plumb <br /> work in the finished structure. <br /> 3.05 MIXING CONCRETE <br /> A. Transit mix the concrete in accordance with provisions of ASTM C94. <br /> B. Do not use concrete that has stood for over 30 minutes after leaving the mixer, or <br /> concrete that is not placed within 90 minutes after water is first introduced into <br /> the mix. <br /> 3.06 PLACING CONCRETE <br /> A. Preparation: <br /> 1. Remove foreign matter accumulated in the forms. <br /> 2. Rigidly close openings left in the formwork. <br /> 3. Wet wood forms sufficiently to tighten up cracks; wet other material <br /> sufficiently to maintain workability of the concrete. <br /> 4. Use only clean tools. <br /> B. Conveying: <br /> 1. Perform concrete placing at such a rate that concrete which is being <br /> integrated with fresh concrete is still plastic. <br /> 2. Deposit concrete as nearly as practicable in its final location so as to <br /> avoid separation due to rehandling and flowing. <br /> 3. Do not use concrete which becomes non-plastic and unworkable, or does <br /> not meet required quality control limits, or has been contaminated by <br /> foreign materials. <br /> 4. Remove concrete from the work site that does not meet specifications. <br /> C. Placing Concrete in Forms: <br /> 1. Deposit concrete in horizontal layers not deeper than 24 inches, and <br /> avoid inclined construction joints. <br /> 2. Remove temporary spreaders in forms when concrete has reached the <br /> elevation of the spreaders. <br /> D. Placing Concrete Slabs: <br /> July 2007 Division III-88 <br /> NEI Phase II Water and Sewer <br /> CIP Nos. 7468, 7589, 7590 <br />