SU767050A1 - Surface-active additive to cement - Google Patents

Description

(54) SURFACE-ACTIVE ADDITIVE TO CEMENT

one

The invention relates to the production technology of building materials, in particular to the composition of additives to cement .5

Known surfactant additive to cement, including technical or refined lignosulfonates

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Closest to the invention in terms of | Q composition and the achieved result is a surface-active additive, comprising 1 part by weight of fatty amines with C. o or aromatic amines or derivatives and from 5-25 parts by weight. . lignosulphonates (in terms of dry matter) C23.

A disadvantage of the known surface-active additives is their retarding effect on the process of hydration and hardening of the cement and, consequently, a decrease in the strength of the cement stone.

The aim of the invention is to increase the strength of the cement stone. 25

The goal is achieved by the fact that the pore-active additive, which includes the nitrogen-containing substance and the lignonyl sulfonate, contains polyalkylene polyimine or its derivatives as the nitrogen-containing compound in the following ratio of components, parts by weight:

Polyalkylene 1

or its derivatives

Lignosulfonate 25-200

The additive can be added to the cement when grinding or with mixing water in an amount of 0.05-1.00-6 by weight of the cement.

Modifying the lignosulfonates with polyalkylpolyimine and its derivatives leads to a change in the functional composition and molecular weight of lignosulfonates. In the case of modified lignosulfonates in the molecule, active polar imino or amino groups in the case of the use of polyalkylenepolymine derivatives promotes better crystallization of cell ga limes of cell ga ga ga ga cc cc ccd ccdr. stone, and the increase in molecular weight - reduced air-entraining ability lignosulfonates, which has a positive effect on the strength characteristics of cevteHTa during heat and moisture treatment.

Claims (2)

Examples of compositions and their effect on cement strength are given in the table. Note Thermal moisture 2+ 3+ 6+ 2 ° Polyhecylenymine polyethylenyimine, polyethyenepolyumin, and hydroxy-prolineated polyethylenimine are used in the baking environment. The use of the additive improves the strength of HbfcTb cement stone, improves the plasticization properties of cement tiles; . It makes it possible to reduce the consumption of cement per 1 m of concrete and the laboriousness of carrying out concrete work. The formula of the addition of the Surface-active additive to Cement, including a nitrogen-containing substance and lignosulfonate, is characterized in that, in order to improve the strength of the cement stone, the treatment is carried out according to the regime. bya Contains as polyglycylene-polyimine vegetation as nitrogen, or its output in the following boiler ratio, parts by weight: Polyalkylene polymine 1 or its derivatives Lignosulfonate 25-200 Sources of information taken into account during examination 1. Chekhovsky S. Reduced permeability of concrete. M., Energie, 1968, p. 79. 2. Authors certificate of the USSR 631483, cl. C 04 B 7/35, C 04 B 13/24, 11.04.77.