CONCRETE Like brick, concrete can be ground on-site into aggregate that can be used for variety of purposes. Like brick, ground concrete waste can be used on-site as a base for new concrete and asphalt paving, drainage stone, or borrow pit ﬁll. Unlike brick, concrete can be more problematic to reuse because it usually contains steel, in the form of rebar or welded wire mesh. Advanced on-site grinders can handle the grinding of concrete with embedded steel, and even sort out the metal after grinding. In selective cases, and with the approval of the architect and engineer, concrete slabs can be graded over and left buried on the site. The depth of ﬁll and drainage are issues that must be reviewed before undertaking this measure. Most importantly to the contractor, though, is the fact that reusing concrete on-site can save a great deal of money in tipping fees to recyclers and in hauling costs for the weightiest component of demolition waste. Concrete slabs may also be retained, without removal, as subbases for other work, including new paving, new concrete toppings, or ﬁnishes. This use is always subject to cooperation by the architect, and a mutual determination that the existing slab is suitable for use as a base for new construction. National concrete repair services can clean, patch, and restore stained or cracked concrete to a like-new appearance in those situations where ﬂoor levels do not permit using a concrete topping.
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