SU814935A1 - Building mortar - Google Patents

Description

one

The invention relates to building materials, namely to compositions of building solutions for hydrotechnical and hydroamelioration purposes.

A concrete mixture is known, including cement, sand, crushed stone, hydrazine production and water i.

Closest to the proposed technical suadnoshi is concrete mixture 2, containing, sec.%: Portland cement 20-25 Slag-sieve

rubble39,5-42

Perlite sand 25-28 Calcium nitrite-nitrate 0.1-1.0 Polyvinyl alcohol 0.4-4.0. Water Remaining.

A disadvantage of the known formulations is increased permeability and low tensile strength.

The purpose of the invention is to increase the water tightness and the tensile strength during bending.

The goal is achieved by the fact that the mortar, BKjao aiaitHft cement, sand, polyvinyl alcohol and water, additionally contains hydrazine hydrate and diisocyanate in the following ratio of components, wt.%:

o Cement 20.2-27.6

Sand 58,7-67,38

Polyvinyl

alcohol ©, 4-4,6

Hydrazine hydrate 0.01-0.4

5 Diisocyanate 0,016-0,64 Water Else,

The positive effect of the joint use of razinehydrate hydroxide 20 and diisocyanate as a dobushki is due to the possibility of chemical interaction according to the scheme

Where

The addition of additives to the mortar mixture is carried out with mixing water. Prepare 7 mortar mixes, the compositions of which are given in Table 1.

Table

Polyvinyl 0.8 0.8 0.8 0.8 alcohol 0.01 0.4 0.1 Hydrazium hydrate Toluenendioe0,016 0.64 0.16 Cyanate 1,3- Adamantyldiidiocarbonate. - | 1. Difesh1Lmetan-4,4 diisocyanate 12.874 11.86 12.64

The preparation of the compositions of the solutions is carried out by mixing in a mixer for 4-5 minutes. At the same time, an aqueous solution of polyvinyl alcohol and hydrazine-hydroxide 3.5 rata is added at first, and after stirring the solution for 1.5 minutes, an aqueous solution of diisocyanate. Then, in standard metal forms, the samples are molded, the compaction of which is carried out on a vibrating roller (vibration amplitude of 0.6 mm, number of oscillations of 3000 vibrations / min).

The formation of oligoureylene is determined by the fact that by analysis methods, 60 (extraction and subsequent chromatography, elemental analysis, potentiometric titration with a solution of nitrate, sodium), only 6-9.5% of the amines resulting from the interaction were found: 65

The samples were baked out before the heat treatment was started 2-2.5 hours. The heat treatment was performed according to the 3 + 6 + 4 mode (hours) at an isotherm of 85 ° C. The most recent storage of products (until testing) is carried out in a normal hardening chamber at a temperature of 20 + 2 s and a relative humidity of 95%.

The comparative characteristics of the properties of the known composition of the mortar and those proposed after 24 days of normal storage are given in Table 2.

table 2

The mode of diisocyanates with water, in the IR-spectrum of powder prepared from cement stone, is found in the following bands: absorption in the region 1700-1720 (amide 1), 1520-1540 cm- (amide 11) and 12201260 cm- (C-O). 4.0 0.4 0.8 0.8 0.2. 0.2 0.4 0.4 0.32 0.32 11.2 11.5 11.86 11.86

5814935 "

Claims (2)

Invention Formula Polyvinyl Mortar, incl. Hydrazine hydrate 0.01-0.4 cement, sand, polyvinyl alcoholDiisocyanate 0.016-0.64 and water different in that. Water Else that, in order to cause water damage, it is. permeability and ultimate strength at races- sources of information bending stress, it is additionally taken into account during the examination contains hydramihydrate and diisocyanate with the following ratio of component-1. Patent Cnuv I 3591394, combo in solution, wt.%: sh 106-87, C 04 B 21/00, 13 / 26,1971, Cement 20.2-27, 2. USSR author's certificate sand 58.7-67.38 .. 483360, cl. From 04/13/24. 20.11,73, alcohol 0.4-4.0