CH149945A - Manufacturing process for lightweight concrete and mortars. - Google Patents

Description

  

  Manufacturing process for lightweight concrete and mortars. The present invention relates to a method of manufacturing lightweight concrete and mortars, which can be carried out, for example, as follows. takes 100 kg of cement, 80 liters of water, 1 liter of a water repellent material, sold under the name of trycosal, to prevent water absorption by the mortar after it has set. The water and the water repellent mixed together are poured into a tank provided with whips partially rotating in the air and in the mixture, so that air bubbles are entrained in the mixture. Cement is then introduced.

   The whips are put into action after or during the introduction of the cement and impart to all the material a concomitant translational and gyration movement.



  The trapped air bubbles swell the mixture and after 10 to 15 minutes the mixture is poured into the molds where it completes its setting and from where it can be removed approximately 24 hours after pouring. During the whipping of the material, the latter arrives, as a result of the composition of the substances employed, at a degree of colloidal state such that it is able to fix and trap the bubbles of atmospheric air introduced by the whips in the mixture to which the movement described above is granted.



  It is also possible to add silicate of soda and potash and diamonds to the mixture; which are silicates which are not commonly used with cement; they are used here to increase the viscosity of the fluid mixture as needed.



  These products can be added in very small quantities to modify the colloidal state of the liquid.



  It has been found that the very fine particles resulting from the spraying of certain materials contained in lime and hydraulic cements, in particular silicates and aluminates added to lime- or magnesia-based mortars, pass to the gelatinous state. when these mixtures are suitably stirred in suitable apparatus and this gelatinous material remains in suspension long enough to allow the mixtures to trap air or gas bubbles which they retain until the mortar has completely set.

   The mixtures can also be added with a "baking powder", or 'baking powder according to the known use to cause swelling and to facilitate in the mixtures the imprisonment of air or gas bubbles, whether keep until the mortar has set completely.



  The formation of mixtures can also be facilitated by the addition, in small amounts, of sulphates or alkali carbonates, or by the introduction of silica, alumina or any other similar gelatinous material.



  In the manufacture of concrete by the process described, the mortars can be poured directly either in place or in the molds, or else be mixed, beforehand in the grout, with mortars of different densities, which are then mixed to the necessary degree. to the lightness, impermeability or insulation that we want to obtain.

 

Claims (1)

CLAIM A method of manufacturing lightweight concrete or mortar, characterized in that the mixture of materials forming the concrete or mortar is subjected to the action of a stirrer, introducing air into the mixture, of which the components were chosen so as to form a gelatinous and viscous mass trapping, in the form of bubbles, at least part of the air introduced. SUB-CLAIMS: 1 A method according to claim, characterized by the addition of carbonates in small amounts. 2 A method according to claim, characterized by the addition of alkali metal sulfates. 3 A method according to claim, characterized by the addition of gelatinous silica and alumina. 4 A method according to claim, in which mixtures of different densities are mixed together.