CS217017B1 - Fast curing liquid consistency mixture - Google Patents

Abstract

The invention relates to a fast-setting concrete mixture of liquid consistency consisting of cement, fillers, modifying additives adjusting the properties of binders, or water dispersions of macromolecular substances, in which the flow properties are achieved by a combination of polyvinyl alcohol and the regulation of the solidification of the binder triethanolamine. The invention can be used with advantage in the manufacture of eamonilevelling floors, in the production of exposed concrete, or in the manufacture of elements with a structured surface. The advantage of the used triethanolamine also lies in the significant reduction of the corrosive properties of the cement on metal elements.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fast setting concrete composition of liquid consistency consisting of cement, fillers, modifying additives for binding binder properties, or scientific dispersions of macromolecular substances wherein flow properties are enhanced by a combination of polyvinyl alcohol and triethanolamine binder.

Heretofore known fast setting concrete erjsi liquid consistencies are prepared from high-performance oements and a relatively high water coefficient. The disadvantage of this method is a considerable reduction in the mechanical strength of the resulting product and the mixing of the mixture during processing.

According to other methods, the liquid compositions are prepared using melamimformaldehyde oligomers containing sulfo groups and polyacrylamide (Pat. NSR 21 46 709, Pat. Switzerland 564 492). The disadvantages of this process are the difficult preparation of the oligomer and the specific action of additives which do not have universal application.

According to other methods, the liquid mixtures are prepared by means of an excess of aqueous dispersion polymers (Swiss Pat. No. 572 007), by means of hydrocarbon esters, in particular oligesaccharides (Pat. French 9 83 939. Pat. NSR 6 00 172). In these methods, there is a significant decrease in mechanical strength and a decrease in resistance to moisture and water.

The above drawbacks are overcome by the fast setting concrete composition of the liquid consistency according to the invention, which is based on the use of polyvinyl alcohol for liquefaction and triethenalamine and / or calcium formate for controlling the solidification. Trietanalamine acts as a surfactant and prevents the mixing of concrete. Said additives have very good compatibility and aqueous polymer dispersions which are used to increase the tensile and flexural strengths and reduce the modulus of elasticity of the resulting product.

The quick-setting concrete composition according to the invention can advantageously be used for the production of self-leveling floors, for the production of exposed concretes, or for the production of elements and a rugged surface.

The advantage of using triethanolamine is furthermore to substantially reduce the corrosive property of the cement to the metal elements.

Example 1

30.0 wt. white cement class 400, 65.0 wt. 0 to 8 mm, 1.0 wt. % calcium formate, 3.0 wt. green chromium pigment,

0.9 wt.% ... aluminum sulfate and 0.1 wt. calcium lignosulfonate. Ke 100 wt. 18 parts by weight of the homogenized dry mixture are added. parts of water containing 1 hand. part. polyvinyl alcohol having an aqueous solution viscosity of 4% solids content of 18 mPAs and an acid number of 6.5 mg KOH / g and 0.2 wt. parts of triethenalamine. The blend has a consistency of BS 20 with VEBE and a setting time of 0.4 to 0.7 hours when processed. The blend-free blend has a consistency of BS 86 VEBE and a setting time of 2 to 3.5 hours. Example 2

25% by weight are perfectly homogenized. cement PC 325, 73% wt. % by weight of limestone grits of 0.0 to 16.0 mm, and 2 wt. sodium sulfate. Ke 100 wt. 15 parts by weight of dry mixture are added. parts of water containing 2.5 wt. parts of polyvinyl alcohol having a 4% by weight aqueous solution of 9 mPAs and a K value of 48 and 1.0 wt. % of triethanolamine and 2.0 wt. % by weight of a water dispersion of polyvinyl acetate having a dry weight of 50 wt. The composition has a consistency of BS 15 with VEBE and a setting time of 0.5 to 1.2 hours during processing. The composition without additives has a consistency of BS 83 and VEBE and a setting of 3-4 snake.

Example 3

Dakonale homogenizes 30.0% of the touch. strucoportland cement SPC 250, 32.0 wt. sand with a grain size of 0 to 8 mm, 32.0 wt. gravel with a change of 8 to 16 mm, 2.0% tactile. of carbonic acid amide, 3.6% tactile. acid casein, and 0.4% palpation. hexamethylenetetramine.

K 100 tact. 12.5 parts of dry mix are added. parts of water containing 0.5 wt. parts by weight of polyvinyl alcohol, 0.1 wt. parts of trietanalamine and 5 wt. parts of an aqueous dispersion of styrene-acrylate. % of dry matter 50% After mixing, the mixture has a workability of BS 32 with VEBE and a setting time of 0.4 to 1.1 snake. The unadditioned mixture has a permeability of BS 86 with VEBE and a setting time of 3 to 4.2 hours.

Claims (2)

SUBJECT OF THE INVENTION Consistency of cement, fillers and modifying agents which modify the properties of the binder or of aqueous dispersions of macromolecular substances, characterized in that it contains from 0.1 to 12.0% by weight, based on the binder, of liquefying agents. % of polyvinyl alcohol having a molecular weight determined from a viscosity of the solution in acetone in the form of a Fikentacher K value in the range of 30 to 70, with a viscosity of an aqueous dry matter solution of 4% by weight; 8 to 25 mPAs, having an acid number of less than 10 mg KOH / g and a saponification number of 80 to 150 mg KOH / g and a specific conductivity of not more than 500 me / cm, and contains 0.5 to 6.0 wt. calcium formate and / or 0.05 to 3.05% tactile. trietanalamine 2. The curing mixture according to claim 1, characterized in that it contains an aqueous dispersion of the macramolecular substance in an amount of 2.0 to 18.0% of dry matter per binder content.