SU1692965A1 - Light-weight concrete mix for safeguard structures used in corrosive media - Google Patents

Abstract

The invention relates to building materials, in particular, to lightweight concrete mixtures used in the manufacture of enclosing structures exposed to aggressive liquids. The purpose of the invention is to reduce thermal conductivity. Light concrete mix contains, wt%: cement 16.8-23.5, carbamide resin 0.053-0.074, polyamine resin 0.012-0.01, sulfite-yeast mash 0.014-0.019, amino compound of the formula: NH2-CR-NH2 (R - oxygen or sulfur) 0,014-0,019, water 16,0-23,0, porous fillers - the rest. The coefficient of thermal conductivity of the composition is 0.4-0.5 ° C), 2 tab. .

Description

The invention relates to building materials, to compositions of light concrete mixes for the manufacture of predominantly enclosing structures of livestock buildings (floor coverings, walls), resistant to aggressive liquid environments with increased thermal protection requirements.

The aim of the invention is to reduce thermal conductivity.

Portland cement or slag Portland cement MZOO-M400 is used as a glue.

As a large porous aggregate, expanded clay gravel with a bulk density of 500 kg / m3, fractions of 5-10 mm, 10-20 mm is used, and as fine

aggregate - expanded clay sand of the same plant with a density of 650 kg / m3, fractions of 0.16-5.0 mm or azeritic gravel with an average bulk density of 377 kg / m, fractions of 10-20 mm and from the same material azerite sand with an average bulk density of not more than 600 kg / m3.

The urea resin used to prepare the mixture is a K-411-02 resin. This is a 50% solution of oligomer K-411-02 in butyl alcohol. The structure of this oligomer can be represented as a linear formula:

KN-SNGOS4N9 CO

YAN-SNGOS4H9 NH-CHjOC Hg

...- N

-Chv

WITH

I

-NSO -CH2- NС

S N5 O O JV

-sng-

It is an esterified urea-formaldehyde oligomer obtained by condensation of urea with a large excess of formaldehyde in an acidic medium in the presence of butyl alcohol. The main functional groups of resin K-411-02 are (MH), (CH2) and part of the alcohol molecules. Resin K-411-02 corresponds to GOST 5544-72. In the complex additive, urea resin is a structure-forming component.

The polyamine resin of the C-89 brand is produced according to TU 6-05-1224-76 in the form of a dark homogeneous liquid with a greenish tint with a resin concentration in the aqueous solution of about 30% (29/45%) and a content of bound hydrogen chloride of 15.5–18 ,five%. Get the resin from epichlorohydrin and metaphenylenediamine. Resin Formula:

HC1

-CHrCH-CH2JNH- NH-CH2-OH

HC1

-cH-cH, + NH-O NH-cHj-cH-cH2 he

he

where n 1.5.

The functional groups in the resin are groups and -OH. In the complex additive, the polyamine resin is a structure-forming component and a hardener of the carbamide resin.

The sulphite-yeast brew (MDB) is used in the form of an aqueous solution of 30% concentration. RRM is a by-product of the pulp and paper industry. The formula is SDB-RZOZA, where A is a cation, P is a lignin group. The main functional groups of PRS are: - OH, -COOH, S020, which are characterized by high surface activity. RRM must comply with the requirements of OST 81-79-74 Sulfite-yeast concentrate concentrates of the Ministry of the pulp and paper industry of the USSR. In the complex additive, the SBD is a urea resin stabilizer.

Urea or triurea can be used as the amino compound with mobile hydrogen atoms of the general formula NH2-CR-NH2, where R is oxygen or sulfur.

Urea is carbonic diamide (carbamide) of the general formula

/ 2

with about

NNH2

0

five

0

five

0

five

0 5 0

five

It is a white crystalline substance, soluble in water, alcohol, formalin, liquid ammonia. Get urea from ammonia and carbon dioxide. Urea must comply with GOST 5.2206-74. Thiourea, as well as urea, is a nitrogen-containing substance of the general form / NH,

 . "

C - S

shg

It is a white crystalline powder, soluble in water. Thiourea is obtained from ammonium thiocyanate by decomposition by heating.

Urea or thiourea contribute to the elimination of the polarization of the polyamine resin and some porisation of the concrete mix.

Concrete mixing water is accepted in accordance with current regulations.

From the above components were prepared mixtures, the compositions of which are listed in Table 1.

The mixtures were prepared as follows: after washing, drying and dosing the components, they were mixed in the following sequence. Coarse and fine porous aggregates were pre-mixed, cement paste was separately prepared, into which carbamide resin, previously mixed with RBS, was injected, and the mixture was stirred for 1-2 minutes.

Urea or thiourea was introduced into the polyamine resin, and the mixture was stirred until the latter was completely dissolved, after which it was introduced into cement paste containing carbamide resin and MDB. The mixture was mixed once more and aggregates were added. The total mixing cycle should not exceed 20 minutes.

Samples 10x10x10 cm in size were made from mixtures of the indicated compositions and tested. The test results are shown in table 2.

Claims (1)

Invention Formula Lightweight concrete mixture for enclosing structures exposed to corrosive media, including cement, porous aggregates, urea and polyamide resins, sulphite-yeast mash and water, characterized in that, in order to reduce thermal conductivity, it also contains an amino compound with mobile hydrogen atoms Formulas: NH2-CR-NH2, where R is oxygen or sulfur in the following ratio of components, mns.%: cement carbamide resin polyamine resin sulphistand yeast 16.8-23.5 0.053-0.074 0.012-0.017 niya 0.014-0.019 0.014-0.019 16.0-23.0 rest Table 1 Compositions of concrete mixes on expanded clay and acheoite fillings with lmico-compounds with urea and thiourea OL Table 2 The test results of samples from the presented bacon mixtures Density kg / m 13 01Ь Э1390 Ul8Й13Й1813 0ШЭ1390Ulc1 лЗ NPA162022 221522,8162E222215 MPa131618 181313,21316131813 mm / m0,280,330,30 0,27О., 370.23Т, 330,300,270, Compressive strength Recognized strength. Linear shrinkage Initial modulus of elasticity Resistance in medium livestock buildings Water resistant Water absorption by weight MPa 10500 11000 11500 10000 11200 928710500 110EE 11500 1000011200 K ° 0.53 1.0 1.1 1.0 0.99 1.00.93 1.0 1.1 1.00.95 MPa 0.70 0.75 0.80.0.72 0.68 0.610.70 0.73 0.30 0.720.63 Ь, 5 М М Ъ, 3 М 92It, 5, 1 40 М43 Coefficient of thermal conductivity ) 0, (8 0.46 0.40 0.50 0, M 0.52 0,) 3 3, 0, E 0.50 0, Specifications Values in the examples 12 13 1 14 1 15 Г 16 Г 17 16 I 19 1 20 Г 21 Ти Density 1139 1206N8212051205120511391206120512051205 2022221522,81620222215 1618181318,21316181613 0,330,300,270,340,370,280,330,300,270,34 11000 1155012700Yu500 117009751110251155012075Yu50011760 1,051,161,051,041,051,031,051,161,051.04 0,830,880,790,750, 770,830,880,790,75 4.03,73,94,14,4 b, 0 3,73,63,94,1 Strength under compression (j Recognized Strength 13 Linane shrinkage 0,28 Initial modulus up- Persistence in livestock buildings environments 1.03 Water resistant i 0.77 Water absorption by mass 4.6 Coefficient of thermal conductivity oh 41 0,39- 0,34 0,42 0,37 0,44 0,41 0,39 0,34 0,42 0,37 Continuation of table 2