SU814933A1 - Concrete mix - Google Patents

Description

(54) CONCRETE MIXTURE

The invention relates to construction materials, namely, concrete mixes for structures and structures for hydrotechnical and hydromeliorative purposes. A concrete mixture is known, including cement, sand, crushed stone, hydrazine derivatives and water. Closest to the proposed technical entity is a concrete mixture of 2, containing, wt.% Portland cement (On acositic alum 39.5-42 rubble 25-28 Perlitovy sand 0.1-1.0 Calcium nitrite Polyvinyl nitrite 0 , 4-4.0 alcohol Else The disadvantage of known concrete mixes is increased permeability and reduced tensile strength under bending. The purpose of the invention is to increase the water tightness / compressive strength and stretch when bending. including cement, sand, u Ben, polyvinyl: pirat and water, additionally hydrazine hydrate and diisocyanate with the following ratio of components in Ch4exi, wt.%: 14-22 Cement 18.1-26 Polyvinyl crushed stone 0.4-4.0 0.05 -2.0 Hydrazinehydrate 0 , 08-3.2 Diisocyanate Else The introduction of additives into the concrete mixture is carried out by mixing water.The preparation of the composition of the solutions is carried out by mixing in the mixer for 4-5 minutes. At the beginning, an aqueous solution of polyvinyl alcohol and hydrazine hydrate is added, and after mixing the mixture for 1.5 min - an aqueous solution of diisocyanate. Then, standard samples are molded into standard metal forms, which are compacted at the vybroplatform (vibration amplitude 0.6 mm, number of vibrations 3000 vibrations / min). The samples are held for 2-2.5 hours before the heat treatment begins. Heat treatment is carried out in 3 + 6 mode +4 (clock) n & and isotherm. Further storage of products in the normal chamber

hardening at a temperature and relative humidity of 95%,

 7 compositions of concrete mixtures, the content of components in which is given in Table 1.

Table 2 shows the comparative characteristics of indicators of properties

nO "C N-R-N C" OtnHiN-MHa-HiO- - O C M-R-NH-C-t-NH-NH-C-HH-R-Nri-C -NH-NMi r HiO. About 00 Their formation is confirmed by the fact that analysis methods (extraction and subsequent chromatograph, elemental analysis, potentiometric titration with sodium nitrite solution) revealed only 5% of the amnesms formed as a result of the interaction

7.97 7.9 7.9 8.4 Predal-Strength, kgf / cm under bending under compression Filtration coefficient, cm / s

samples after heat treatment and storage for 28 days in a chamber of normal hardening.

The effectiveness of the joint use as an additive of hydrazine hydrate and D ({isocyanate is due to the possibility of the formation of oligoureylenes according to the scheme

Table

1.6

1.6

7.9 7.9

6.9

Table 2 54.8 60.3 69.9 57.3 66.4 64.6 63.8 48.1 454 482 511 473 526 486 468 422 0.6-10 0.8. ,, 1. ,, 1 -10 0.1.10 0.1-10 diisocyanates with water, and in the IR spectra of the powder prepared from cement stone, the absorption bands are found in the 1700-1720 CM area (amide) 1520-1540 cm- {amide P) and 12201260 cm - (C-0).

58149336

Claims (1)

The formula of the invention Crushed stone 45-50 Concrete mix, inclusive aeMeitT, alcohol 0.4-4.0 sand, crushed stone, polyvinyl alcoholHydrasing hydrate 0.05-2.0 and water, diisociavate 0.08-3.2 that, in order to increase the waterproofness, Water Else, capacity and compressive strength-Sources of informational, and stretching when bending, it is well understood by the examination Completely contains hydrazine hydrate. U.S. Patent 3,591,394 and diisocyanate in the following ratio-CL. I06-ft7, cl. C 04 B 21/00, 13/26, SRI of composites; in the mixture, wt.%: C, 1971. -. Cement 14-222. USSR author's certificate  sand 18.1-26W483360, cl. From 04 To 13/24, 11/20/73. Popivinyl