Drying the surface of a fresh concrete body

Details Drying the surface of a fresh concrete body Drying the surface of a fresh concrete body

1990-01-19

1992-04-14

Aftergut, Karen

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

34 9, 34 17, 34 39, 34 95, 34DIG1, 219 65, 219 1041, 219 1057, 219 1065, 219 1079, 264344, 264345, 264DIG43, 264DIG46, 404 77, 404 79, B29C 7102, B29C 7104, F26B 3347, H05B 602

Patent

active

051045940

ABSTRACT:
A surface of a fresh concrete body is dried by first covering the surface to be dried with a layer of bibulous granules having a great internal surface area for a time sufficient to draw generally all of the water out of the body via the surface and then preventing water from entering the layer from its side turned away from the body. The granules are finely divided hygroscopic particles, with an internal surface area of at least 200 m.sup.2 /g, preferably at least 800 m.sup.2 /g. The hydrophilic particles take up the moisture from the concrete and hold it in the layer of particles lying on the surface. This reduces the partial vapor pressure on the surface of the concrete body which effectively draws further liquid out of the concrete. The particles are a mixture of a cross-linked polymer that only swells in water and silica. The particles are carried in a coherent mat and are applied as a layer to the surface by laying the mat thereon. This mat has a moisture-pervious face and a moisture-impervious face so that water is prevented from entering the layer from the side turned away from the body by orienting the moisture-impervious face away from the body. The moisture-impervious face is formed by a synthetic-resin sheet.

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