B - Operations – Transporting – 28 – B
Patent
B - Operations, Transporting
28
B
25/108
B28B 11/04 (2006.01) C04B 41/48 (2006.01) C04B 41/63 (2006.01)
Patent
CA 1038140
"Constructional Units" ABSTRACT OF THE DISCLOSURE A constructional unit is cast from a mixture containing calcined gypsum as a binding agent and water forming a fluid composition by pouring the composition into a mould where it is allowed to set so that it is self supporting and is warmed by the heat of reaction of the gypsum with the water and then the unit so formed is provided with a water resistant surface by applying a moisture curing liquid synthetic resin which swells during curing to the surface of the unit. The resin is drawn into the surface of the unit by capillary action and is there cured by the warmth and moisture remaining in the set composition so that it fills and seals the pores of the surface. Preferably the synthetic resin, which is a polyurethane composition is applied to the surface of the unit before or immediately after it has been removed from its mould and while the unit is at a temperature of from 90° to 180°F. The unit is then placed in a heat insulating and moisture impervious jacket to control the dissipation of heat and moisture from it and maintain its heat and moisture content for a period of at least two hours during which the resin is cured. - 1 -
230286
Grebe Byron
Lowe James N.
Grebe Byron
Lowe James N.
LandOfFree
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