1001. 3(p) 1001. 3(p)
3.a.1 Formed Surfaces. For formed surfaces, perform water curing during the finishing period and until forms are removed. Apply the first coat of curing compound immediately after stripping forms, and after acceptance of the concrete finish. If the surface is dry, soak the concr ete with water, and apply the curing compound just as the surface film of water disappears. During spray -curing operations, keep unsprayed surfaces wet with water.
3.a.2 Unformed Surfaces. Apply curing compound to unformed surfaces immediately after finishing operations have been completed and after the surface film of water has disappeared. When applying curing compound after water curing to unformed surfaces , apply curing compound onto the surface within 30 minutes of removing the curing covers . Apply curing compound when no free water remains on the surface, but while the surface is still saturated. If the surface is dry or becomes dry, thoroughly wet the surface using a fogger or mister.
3.b Water Curing. 3.b.1 General . Use curing covers of either a double thickness of burlap, white polyethylene sheeting placed on top of a single layer of burlap , or burlap- backed white polyethylene sheeting. Use one type of cover for the duration of curing, unless a change in type is accepted or a combination of covers are accepted. Place curing covers in a manner that minimizes marring of the finished surface. Secure curing covers to prevent lifting or displacement due to adjacent construction operations or wind. Provide a minimum of 2 feet overlap at white polyethelyne sheeting edges. Replace any torn or damaged curing covers as directed. If curing covers are temporarily removed for any reason during the curing period, use watering devices to keep the entire exposed area continuously wet. Replace saturated curing covers as soon as possible. Saturate curing covers before use and keep in a saturated condition for the curing period. Soak burlap for a minimum of 48 hours before placement. Re- wet burlap as needed before placement. During times of delay expected to exceed 10 minutes, cover concrete that has been placed, but not finished, with wet burlap. As soon as the concrete can support curing covers , place curing covers on the exposed concrete. Minimal marking of the concrete from curing covers is allowed. If the double thickness of burlap method is used, place second layer of burlap so each strip overlaps one- half the width of the preceding layer . Maintain curing covers in a fully wet condition using misting hoses, fogging machines, or other accepted devices until the concrete has sufficiently hardened to support watering devices . As soon as forms or sections of forms are lo