When the Taylor Wine Company of Hammondsport, New York, planned a warehouse addition company executives knew from experience that only a heavy-duty concrete floor would be adequate. Accordingly they specified a 1 inch thick hard topping slab to be installed by a specialty contractor over a 7 inch reinforced slab. The general contractor studied the use of vacuum dewatering equipment and concluded that the use of a metallic aggregate floor hardener in combination with vacuum dewatering would produce a superior floor with wearability not exceeded by that of any other floor. Test results confirmed that the wearability would be at least four times greater than that of a hard topping slab made with natural aggregates. Also, a cost calculation indicated that a very satisfactory saving was possible. The general plan was to place, vibrate, and strike-off the concrete with a vibratory screed and then vacuum dewater the fresh concrete. After about 30 minutes of dewatering the vacuum mats would be moved to the next portion of the slab and power floating would begin immediately on the dewatered portion. During the floating operation metallic aggregate would be applied in two or three shakes and worked into the surface. Subsequently, the floor would be power-troweled to a high shine and finally a curing compound would be used. Again in both early and ultimate strength is typical for all properly a vacuum treated concrete. On this job, a hammer was used after 6 days to chip some concrete along one edge. Inspection found that the concrete was already strong enough at that age for the fracture to occur through the aggregate.