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<br />03300 - 12/22 <br />water reducer is used in the wall concrete, then the pea gravel joint topping <br />does not need to be used. <br />D. Placing Interruptions: When placing of concrete is to be interrupted long enough for <br />the concrete to take a set, the working face shall be given a shape by the use of <br />forms or other means that will secure proper union with subsequent work; provided <br />that construction joints shall be made only where acceptable to the ENGINEER. <br />E. Embedded Items: <br />1. No concrete shall be placed until all formwork, installation of parts to be <br />embedded, reinforcement steel, and preparation of surfaces involved in the <br />placing have been completed and accepted by the ENGINEER at least 4 hours <br />before placement of concrete. Surfaces of forms and embedded items that <br />have become encrusted with dried grout from previous usage shall be cleaned <br />before the surrounding or adjacent concrete is placed. <br />2. Inserts or other embedded items shall conform to the requirements herein. <br />3. Reinforcement, anchor bolts, sleeves, inserts, and similar items shall be set <br />and secured in the forms at locations indicated on the Drawings or shown by <br />Shop Drawings and shall be acceptable to the ENGINEER before any concrete <br />is placed. Accuracy of placement is the responsibility of the CONTRACTOR. <br />F. Casting New Concrete Against Old: Where concrete is to be cast against old <br />concrete (any concrete which is greater than 60 days of age), the surface of the old <br />concrete shall be thoroughly cleaned and roughened by hydroblasting or <br />sandblasting to expose aggregate. The joint surface shall be coated with an epoxy <br />bonding agent unless indicated otherwise by the ENGINEER. <br />G. No concrete shall be placed in any structure until all water entering the space to be <br />filled with concrete has been properly cut off or has been diverted by pipes, or other <br />means, and carried out of the forms, clear of the WORK. No concrete shall be <br />deposited underwater nor shall the CONTRACTOR allow still water to rise on any <br />concrete until the concrete has attained its initial set. Water shall not be permitted to <br />flow over the surface of any concrete in such manner and at such velocity as will <br />injure the surface finish of the concrete. Pumping or other necessary dewatering <br />operations for removing ground water, if required, shall be subject to the review of <br />the ENGINEER. <br />H. Corrosion Protection: Pipe, conduit, dowels, and other ferrous items required to be <br />embedded in concrete construction shall be so positioned and supported prior to <br />placement of concrete that there will be a minimum of 2-inches clearance between <br />said items and any part of the concrete reinforcement. Securing such items in <br />position by wiring or welding them to the reinforcement will not be permitted. <br />I. Openings for pipes, inserts for pipe hangers and brackets, and anchors shall, where <br />practicable, be provided during the placing of concrete. <br />J. Anchor bolts shall be accurately set and shall be maintained in position by templates <br />while being embedded in concrete. <br />K. Cleaning: The surfaces of metalwork to be in contact with concrete shall be <br />thoroughly cleaned of all dirt, grease, loose scale and rust, grout, mortar, and other <br />foreign substances immediately before the concrete is placed. <br />3.03 CONVEYING: