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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 avoid <br />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 rejected concrete from the job site. <br />C. Placing concrete in forms: <br />1. Deposit concrete in horizontal layers not deeper than 24", and avoid <br />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 />1. Deliver concrete with maximum slump. <br />2. Deposit and consolidate concrete slabs in a continuous operation, within <br />limits of construction joints, until the placing of a panel or section is <br />completed. <br />3. Bring slab surfaces to the correct level with a straightedge, and then strike <br />off. <br />4. Use bullfloats or darbies to smooth the surface, leaving the surface free <br />from bumps and hollows. <br />5. Do not sprinkle water on the plastic surface. Do not disturb the slab <br />surface prior to start of finishing operations. <br />3.6 CONSOLIDATION <br />A. General: <br />1. Consolidate each layer of concrete immediately after placing, by use of <br />internal concrete vibrators supplemented by hand spading, rodding, or <br />tamping. <br />2. Do not vibrate forms or reinforcement. <br />3. Do not use vibrators to transport concrete inside the forms. <br />4. Comply with ACI 309. <br />3.7 JOINTS <br />A. Construction joints: <br />03300-6 <br />