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The vacuum dewatering process basically improves strength, durability, and other properties of concrete by reducing the water-cement ratio immediately after the mix is placed, usually in floors and other flatwork. A Bridgeport, Connecticut vacuum dewatering demonstration, although it involved no new technical developments, was of interest because the work was supervised by one of the major manufacturers of vacuum dewatering equipment. Concrete was placed in the slab forms, consolidated with immersion vibrators, then leveled and vibrated again with a double-beam vibrating screed. The vibrating screed was pulled over the concrete surface by two men. After screeding, the concrete was immediately covered with a filter pad and a suction mat connected to a vacuum pump. Within seconds the vacuum created under the mat began to compress the concrete and cause water to be drawn through hoses to the suction pump.
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