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r73 <br />w <br />e <br />P+ <br />A. <br />All expansion joints shall be 112 inch thick premolded asphalt <br />impregnated felt strips placed on 40 foot centers. In addition, expansion <br />joints shall be placed at the points of curvature and tangency of all curves. <br />Each joint shall be set plumb, and the top flush with the finished <br />concrete surface. The joint will extend to the depth of the curb and shall <br />be as wide as same. <br />B. <br />Curbs shall have contraction joints, saw -cut, at approximately 10 foot <br />intervals. No contraction joint should be less than 4 feet from an end or <br />expansion joint. Each joint shall be between 1/4 and U2 inch deep. Saw <br />cut joints are not desired, but if some must be cut, the cut must be made <br />after the concrete has set sufficiently to prevent raveling and before <br />shrinkage cracks begin to develop. <br />7. REPLACEMENT OF CURB <br />A. <br />Curbing which is 3/8 inch or more below plan grade. has extensive <br />honeycomb or other irregularities or defects, shall be removed and <br />replaced at the Contractor's expense. Plastering will not be acceptable to <br />bring the curb to grade or to repair extensive honeycomb. <br />8. BACKFILL <br />A. <br />t <br />After the concrete has set sufficiently, but not more than three day after <br />pouring, the spaces in front and back of the curb shall be refilled to the <br />required elevation with the specified materials. It shall be placed in layers <br />not to exceed 6 inches in thickness and compacted to the specified <br />densities. <br />B. <br />Lime rock base shall not be placed against the curb in less than three <br />days after it was poured. <br />