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PGSF WMVD Storm and Combined Sewer - Construction Package 2 Cast-in-Place Concrete <br />Project No. 180162 03 30 00 - 16 <br /> <br />2. Do not use curing compound on concrete surfaces to be coated, waterproofed, <br />moisture-proofed, tiled, roofed, or where other coverings are to be bonded. In these <br />cases, use water curing unless the curing compound is first removed or is compatible <br />with the final finish covering. <br />3.05 PROTECTION <br />A. Protect concrete from injurious action by sun, rain, wind, flowing water, frost, excessive <br />vibration and mechanical means. <br />B. Loading green concrete is not permitted. Green concrete is defined as concrete with less <br />than 100 percent of the specified strength. <br />C. Backfill shall not be placed against concrete walls until the concrete has reached the <br />specified strength, connecting slabs and beams have been cast and have also reached <br />the specified strength, and watertightness testing and repairs have been completed for <br />liquid containing strutures to the satisfaction of the Owner’s Representative. <br />D. Arrangements for covering, insulating, heating, and protecting concrete in cold weather <br />shall be in accordance with ACI 306.1. <br />3.06 CONSTRUCTION JOINTS <br />A. General: <br />1. Place concrete in each unit of construction continuously. Before new concrete is <br />placed on or against concrete which has set, retighten forms and clean foreign <br />matter from the surface of the set concrete. Provide waterstops as specified. <br />B. Construction: <br />1. Form construction joints by producing a rough surface of exposed aggregates using a <br />surface retardant; include joints between the slab and topping concrete. The limit of <br />the treated surfaces shall be 1 inch away from the joint edges. Within 24 hours after <br />placing, remove retarded surface mortar either by high pressure water jetting or stiff <br />brushing or combination of both so as to expose coarse aggregate. A rough surface of <br />exposed aggregate may also be produced by sandblasting followed by high pressure <br />water jetting. Sandblasting, if used, shall remove 1/4 inch of laitance film and expose <br />coarse aggregate to ensure adequate bond and watertightness at the construction <br />joints. <br />C. Locations: <br />1. Provide construction joint locations as follows: <br />a. Cast walls exceeding 50 feet in length in panels not to exceed 30 feet in length. <br />Cast adjoining panels only after 5-days have elapsed. Joints are not allowed <br />within the lesser of 10 feet or 25 percent of the wall length from a corner unless <br />specifically detailed thus on the drawings. <br />b. Locate joints in beams or girders at or near the quarter point between supports. <br />c. Make joints in the members of a floor system at or near the quarterpoint of the <br />span.