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C-1 <br />11 <br />7 <br />t� <br />SECTION 38' - CURBING <br />I 1. GENERAL <br />A. Concrete curbing shall be constructed in accordance with the Plans <br />and Specifications. <br />2. FOUNDATION <br />A. The curb shall be constructed upon a stabilized and compacted subgrade <br />as noted upon the Plans. <br />3. 'FORM WORD <br />} A. After the foundation material is thoroughly graded and compacted to <br />I the required depth, the .forms shall be set true to line and grade and held <br />rigidly in position. Forms shall be either of wood or metal: and they <br />4 shall be straight, free from warp or bends and of sufficient strength <br />waren staked to resist the pressure of poured concrete without yielding. <br />The forms shall have a depth at least equal to the depth of the curb. A <br />special effort shall be made to achieve a straight curb of uniform width. <br />4. CURB MACHINE <br />A. The Contractor may use a curb machine in lieu of forming, but he will <br />be responsible for providing a stable base for the machine. <br />5. CONCRETE. <br />A. Concrete for curbing shall have a minimum compressive strength of 3000 <br />psi at 28 days. Concrete placed with the curb machine shall have zero <br />slump. <br />B. 'PLACEMENT OF CONCRETE <br />1) Concrete shall be placed so as to eliminate honeycombing. The <br />concrete shall be compacted by hand with wood floats and spades <br />worked along the forms and expansion points for the full depth. <br />All compacting shall be performed while the concrete is in a <br />J plastic state and to such extent as will insure a dense mass with <br />even and uniform surface free from segregation, aggregate <br />pockets or honeycomb. Spacer blocks previously placed between <br />and below the tops of the curb forms shall be removed <br />immediately prior to their being buried by the concrete pour. <br />2) Concrete shall not be placed during rain, when the threat of rain is <br />eminent, or when there is standing water between forms. If, <br />however, the concrete has been cast and an unexpected rain shower <br />passes over the site before the concrete has had sufficient time to <br />set, the Contractor shall adequately protect it from water damage. <br />Repair or removal and replacement of the concrete curb because of <br />water damage will be at the Contractor's expense. <br />6. EXPANSION AND CONTRACTION JOINTS <br />sn-1 <br />