SU874699A1 - Composition for treatment of surface of freshly moulded article with open filler - Google Patents

Description

The invention relates to the field of building materials, in particular to compositions used for delay. NIN of concrete hardening during the manufacture; in factory conditions of reinforced concrete products with a facade layer of decorative concrete with bare filling dough. A known composition for surface treatment of freshly formed molds. Manufacturing., Including wt.%: Buru 14-16 Dextrin 32.2-36, 8 Polyacrylamide 2-6 Surfactant 0.1-0.3 Water Else However, the known composition provides a given exposure of the texture of concrete in long-lasting modes of removal. Closest to the invention of the technical essence and the achieved result is a composition for surface treatment of concrete and concrete products 2, including wt.% :. Dextrin 15-25 Divinylstroke latex 6-10 Spun or transformer or machine oil1-8 WaterExtradeal However, during long molding modes, the composition applied to the mold is known, not retained in the lower layer of the product and passes into the structural layer of concrete and thus provides the desired exposure of the aggregate . The purpose of the invention is to increase the degree of retardation of the surface hardening of a freshly shaped product. This goal is achieved by the fact that a composition comprising dextrin, spindle or transformer or machine oil, polymer additive and water contains polyvinyl alcohol as a polymer additive, and additionally borax and sand in the following ratio of components, wt.%: Destrin 20-30 Spun or transformer or machine oil 10-20 Polyvinyl alcohol 0,1-1

Bura1-5

Sand 10-20

WaterEverything

The components that slow down the cement hardening process are borax dextrin and partially spindle or transformer oil or AC-8 engine oil, which make the retarder swelling and diffusing the retarder into the concrete mix layer adjacent to the oil pan, polyvinyl alcohol { Air defense and sand that; reduces contact with the concrete mix and creates a system of strokes, lengthening the path of the passage of the retarders to the concrete mix, stabilizing the diffusion of the hardener in the compacted

concrete mix during long modes of molding.

At the beginning, a 50% dextrin solution, a 50% borax solution and a 5% polyvinyl alcohol solution are prepared in separate containers, with less than 5% acetate groups (5%), then they are incubated for at least 4 hours. Heat up to 40 ° C. The odosed portions of the solutions of dextrin, borax, polyvinyl alcohol, and oil and sand are mixed in a sack. The finished composition is applied with a roller or brush with a layer of 0.3-0.4 mm thick on the kraft paper.

Examples of compositions of the composition are given in table.1.

Table

30 25

- 15

10 .rt0, 1 0.5

1-3

2015

38,941.5

The depth of surface exposure when using the pre-Technological process of making exterior wall panels, for example, 65

20 20

15

10 44

The composition and known composition is given in tALS. 2

Claims (1)

Table 2 on the conveyor is followed. The cleaned and assembled form, iiO comes to the post, where it is laid on the map mats, with the proposed position applied on them. Rugs on the bottom side are glued to each other with strips of paper to prevent their mixing. Then the reinforcement and zakleshnye parts are placed in the form. The decorative, and then constructive concrete mixture is laid and evenly distributed into the prepared mold and the panel is manufactured in the usual manner. After heat treatment with steel brushes or high pressure water, the weakened layer is removed and the large aggregate of decorative concrete is exposed. Thus, with an increase in the molding time, the efficiency and stability of the results in terms of the depth of the decorative filler increases when the proposed composition is applied. In addition, when using the proposed composition, a high quality of exposure is achieved1 "1 regardless of the skill of workers in unstable molding modes, and the manufacturing cycle is reduced, as the composition is applied not to the form, but to kraft paper and it it dries on it and the ready-made mats are laid with the Composition applied on them to slow down the hardening of the cement. Claims of the Invention Composition for treating the surface of a freshly formed product with a binder, including dextrin, spindle or transformer or machine oil, a polymer additive and water, which in order to increase the degree of hardening of the surface, it contains polyvinyl alcohol as a additive , and additionally borax and sand at. the following ratio of components, wt.%: Dextrin Spun or transformer or machine oil Polyvinyl 0.1-1 alcohol Borax 1-5 10-20 Sand Water Ostygshnoe Sources of information taken into account during the examination 1. USSR author's certificate 644745, cl . From 04 V 15/02, 1977. 2, USSR Copyright Certificate for Application No. 2877678, cl. C 04 B 15/02, 01.31.80.