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3 . Transverse Expansion Joints : One half- inch expansion joints shall be <br /> formed by placing preformed joint filler topped with joint sealant at the ends <br /> of each radius return , around all structures , and at intervals specified in <br /> 3 . 03 D4 below and as shown on the DRAWINGS . <br /> 4 . Spacing of transverse contraction and expansion joints . <br /> Walk , Slab Width Contraction Joint Expansion Joint <br /> Spacinq Spacing <br /> 4 ' 4 ' 40 ' <br /> 5' 5' 40 ' <br /> 6 ' 6 ' 42 ' <br /> 8 ' 8 ' 40 ' <br /> 10' 10 ' 40' <br /> Provide isolation joints between slabs on grade and sidewalks adjacent to <br /> fixed objects including curbs , inlets , etc . <br /> E . Finishing <br /> 1 . Strike off the concrete by means of a wood or metal screed used <br /> perpendicular to the forms in order to obtain the required grade , and <br /> remove surplus water and laitance . <br /> 2 . Broom-finish the concrete surface . The surface variations shall not be <br /> more than 1 /4 inch under a 10400t straight edge . Carefully finish the edge <br /> of the slabs on grade and sidewalk with an edging tool having a radius of <br /> 1 /2 inch . <br /> F . Curing : <br /> 1 . After the finishing operations have been completed and as soon as the <br /> concrete has hardened sufficiently that marring of the surface will not occur, <br /> the entire surface and the edges of the newly placed concrete shall be <br /> covered and cured with membrane curing compound . <br /> 2 . Curing compound shall be uniformly applied to the surfaces to be cured , in <br /> a single coat , continuous film , at the rate of one gallon to not more than 200 <br /> square feet , by a mechanical sprayer. <br /> 3 . Curing compound shall not be applied during periods of rainfall . Curing <br /> compound shall not be applied to the inside faces of joints to be sealed . <br /> Should the film become damaged from any cause within the required curing <br /> period , the damaged portions shall be repaired immediately with additional <br /> compound . Upon removal of side forms the sides of the slabs exposed <br /> shall immediately be coated to provide a curing treatment equal to that <br /> provided for the surface . <br /> G . Backfilling and Compacting : After the concrete has set sufficiently , refill the spaces <br /> adjacent to the concrete to the required elevation with suitable material . Place and <br /> thoroughly compact to 98 percent of the maximum density as determined by AASHTO T- <br /> 180 . <br /> 024404 02440 — Concrete Driveways , etc . . . <br />